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Arai R, Miura S, Nakamura Y, Fujie G, Kodaira S, Kaiho Y, Mochizuki K, Nakata R, Kinoshita M, Hashimoto Y, Hamada Y, Okino K. Upper-plate conduits linked to plate boundary that hosts slow earthquakes. Nat Commun 2023; 14:5101. [PMID: 37730797 PMCID: PMC10511545 DOI: 10.1038/s41467-023-40762-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 08/07/2023] [Indexed: 09/22/2023] Open
Abstract
In shallow subduction zones, fluid behavior impacts various geodynamic processes capable of regulating slip behaviors and forming mud volcanoes. However, evidence of structures that control the fluid transfer within an overriding plate is limited and the physical properties at the source faults of slow earthquakes are poorly understood. Here we present high-resolution seismic velocity models and reflection images of the Hyuga-nada area, Japan, where the Kyushu-Palau ridge subducts. We image distinct kilometer-wide columns in the upper plate with reduced velocities that extend vertically from the seafloor down to 10-13 km depth. We interpret the low-velocity columns as damaged zones caused by seamount subduction and suggest that they serve as conduits, facilitating vertical fluid migration from the plate boundary. The lateral variation in upper-plate velocity and seismic reflectivity along the plate boundary correlates with the distribution of slow earthquakes, indicating that the upper-plate drainage system controls the complex pattern of seismic slip at subduction faults.
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Affiliation(s)
- Ryuta Arai
- Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa, 236-0001, Japan.
| | - Seiichi Miura
- Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa, 236-0001, Japan
| | - Yasuyuki Nakamura
- Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa, 236-0001, Japan
| | - Gou Fujie
- Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa, 236-0001, Japan
| | - Shuichi Kodaira
- Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa, 236-0001, Japan
| | - Yuka Kaiho
- Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa, 236-0001, Japan
| | - Kimihiro Mochizuki
- Earthquake Research Institute, The University of Tokyo, 1-1-1 Yayoi Bunkyo-ku, Tokyo, 113-0032, Japan
| | - Rie Nakata
- Earthquake Research Institute, The University of Tokyo, 1-1-1 Yayoi Bunkyo-ku, Tokyo, 113-0032, Japan
- Lawrence Berkeley National Laboratory, Berkeley, USA
| | - Masataka Kinoshita
- Earthquake Research Institute, The University of Tokyo, 1-1-1 Yayoi Bunkyo-ku, Tokyo, 113-0032, Japan
| | - Yoshitaka Hashimoto
- Faculty of Science and Technology, Kochi University, Akebonocho 2-5-1, Kochi, 780-8520, Japan
| | - Yohei Hamada
- Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, 200 Monobe Otsu Nankoku, Kochi, 783-8502, Japan
| | - Kyoko Okino
- Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha Kashiwa, Chiba, 277-8564, Japan
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Comprehensive Investigation of Capabilities of the Left-Looking InSAR Observations in Coseismic Surface Deformation Mapping and Faulting Model Estimation Using Multi-Pass Measurements: An Example of the 2016 Kumamoto, Japan Earthquake. REMOTE SENSING 2021. [DOI: 10.3390/rs13112034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We here present an example of the 2016 Kumamoto earthquake with its coseismic surface deformation mapped by the ALOS-2 satellite both in the right- and left-looking observation modes. It provides the opportunity to reveal the coseismic surface deformation and to explore the performance of the unusual left-looking data in faulting model inversion. Firstly, three tracks (ascending and descending right-looking and descending left-looking) of ALOS PALSAR-2 images are used to extract the surface deformation fields. It suggests that the displacements measured by the descending left-looking InSAR coincide well with the ascending right-looking track observations. Then, the location and strike angle of the fault are determined from the SAR pixel offset-tracking technique. A complicated four-segment fault geometry is inferred for explaining the coseismic faulting of the Kumamoto earthquake due to the interpretation of derived deformation fields. Quantitative comparisons between models constrained by the right-looking only data and by joint right- and left-looking data suggest that left-looking InSAR could provide comparable constraints for geodetic modelling to right-looking InSAR. Furthermore, the slip model suggests that the series of events are dominated by the dextral strike-slip with some normal fault motions. The fault rupture initiates on the Hinagu fault segment and propagates from southwest to northeast along the Hinagu fault, then transforms to Futagawa fault with a slip maximum of 4.96 m, and finally ends up at ~7 km NW of the Aso caldera, with a rupture length of ~55 km. The talent of left-looking InSAR in surface deformation detection and coseismic faulting inversion indicates that left-looking InSAR can be effectively utilized in the investigation of the geologic hazards in the future, same as right-looking InSAR.
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Bonini M. Seismic loading of fault-controlled fluid seepage systems by great subduction earthquakes. Sci Rep 2019; 9:11332. [PMID: 31383890 PMCID: PMC6683289 DOI: 10.1038/s41598-019-47686-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Accepted: 07/12/2019] [Indexed: 12/02/2022] Open
Abstract
Various types of fluid expulsion features (mud volcanoes, pockmarks, authigenic carbonate mounds and associated gas pipes, etc.) are often found above subduction zones, which have the highest seismic potential on Earth. Faults potentially control the liberation of deep-seated greenhouse gases into the feeder systems of seepage features located above subduction thrusts. These feeder systems could be stressed by large earthquakes, yet the mechanisms that can drive episodic mobilization of stored hydrocarbon gases remain poorly understood. Here I address the potential stress loading on fluid expulsion systems created by past earthquakes nucleated at both accretionary and erosive subduction margins. The most significant effects occur in the epicentral area where subduction earthquakes can produce normal stress changes as high as 20–100 bar, although these are generally restricted to relatively small regions. Coseismic normal stress changes and elastic strain relaxation upon a ruptured subduction thrust could increase crustal permeability by dilating fault-controlled conduits, and channelling fluids to the seafloor. Fluid pressure pulses released during subduction earthquakes can greatly contribute to the rupture of fluid pathways that have been brought closer to failure from coseismic static stress changes, although the inaccessible location of most submarine seepage systems has so far hampered probing these relationships.
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Affiliation(s)
- Marco Bonini
- CNR, Consiglio Nazionale delle Ricerche, Istituto di Geoscienze e Georisorse, Sede Secondaria Firenze, via G., La Pira 4, 50121, Firenze, Italy.
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Kano M, Kato A, Obara K. Episodic tremor and slip silently invades strongly locked megathrust in the Nankai Trough. Sci Rep 2019; 9:9270. [PMID: 31239525 PMCID: PMC6592932 DOI: 10.1038/s41598-019-45781-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Accepted: 06/13/2019] [Indexed: 11/16/2022] Open
Abstract
Recent seismic and geodetic observations in subduction zones have revealed that slow earthquakes have preceded some large earthquakes. Characterization of slow earthquakes and their relation to large earthquakes provides important clues to constrain a wide spectrum of slip rates on tectonic faults. Here, we report new evidence of a slow slip transient at the downdip edge of the strongly locked seismogenic zone in the western Nankai Trough in southwest Japan. This slow slip transient was excited during an episodic tremor and slip at the downdip extension of the locked zone. Through this triggering, the frequent occurrence of the deep episodic tremor and slip invades the strongly locked megathrust zone and may intermittently increase the probability of large earthquakes in the Nankai Trough.
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Affiliation(s)
- Masayuki Kano
- Graduate School of Science, Tohoku University, 6-3, Aramaki-aza-aoba, Aoba-ku, Sendai, 980-8578, Japan.
| | - Aitaro Kato
- Earthquake Research Institute, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan
| | - Kazushige Obara
- Earthquake Research Institute, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan
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Moore G, Park J, Bangs N, Gulick S, Tobin H, Nakamura Y, Saito S, Tsuji T, Yoro T, Tanaka H, Uraki S, Kido Y, Sanada Y, Kuramoto S, Taira A. Structural and seismic stratigraphic framework of the NanTroSEIZE Stage 1 transect. NANTROSEIZE STAGE 1 2019. [DOI: 10.2204/iodp.proc.314315316.102.2009] [Citation(s) in RCA: 107] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Araki E, Saffer DM, Kopf AJ, Wallace LM, Kimura T, Machida Y, Ide S, Davis E. Recurring and triggered slow-slip events near the trench at the Nankai Trough subduction megathrust. Science 2018; 356:1157-1160. [PMID: 28619941 DOI: 10.1126/science.aan3120] [Citation(s) in RCA: 181] [Impact Index Per Article: 30.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Accepted: 05/17/2017] [Indexed: 11/02/2022]
Abstract
The discovery of slow earthquakes has revolutionized the field of earthquake seismology. Defining the locations of these events and the conditions that favor their occurrence provides important insights into the slip behavior of tectonic faults. We report on a family of recurring slow-slip events (SSEs) on the plate interface immediately seaward of repeated historical moment magnitude (Mw) 8 earthquake rupture areas offshore of Japan. The SSEs continue for days to several weeks, include both spontaneous and triggered slip, recur every 8 to 15 months, and are accompanied by swarms of low-frequency tremors. We can explain the SSEs with 1 to 4 centimeters of slip along the megathrust, centered 25 to 35 kilometers (km) from the trench (4 to 10 km depth). The SSEs accommodate 30 to 55% of the plate motion, indicating frequent release of accumulated strain near the trench.
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Ikari MJ, Kopf AJ. Seismic potential of weak, near-surface faults revealed at plate tectonic slip rates. SCIENCE ADVANCES 2017; 3:e1701269. [PMID: 29202027 PMCID: PMC5706663 DOI: 10.1126/sciadv.1701269] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 10/31/2017] [Indexed: 06/07/2023]
Abstract
The near-surface areas of major faults commonly contain weak, phyllosilicate minerals, which, based on laboratory friction measurements, are assumed to creep stably. However, it is now known that shallow faults can experience tens of meters of earthquake slip and also host slow and transient slip events. Laboratory experiments are generally performed at least two orders of magnitude faster than plate tectonic speeds, which are the natural driving conditions for major faults; the absence of experimental data for natural driving rates represents a critical knowledge gap. We use laboratory friction experiments on natural fault zone samples at driving rates of centimeters per year to demonstrate that there is abundant evidence of unstable slip behavior that was not previously predicted. Specifically, weak clay-rich fault samples generate slow slip events (SSEs) and have frictional properties favorable for earthquake rupture. Our work explains growing field observations of shallow SSE and surface-breaking earthquake slip, and predicts that such phenomena should be more widely expected.
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Yamashita Y, Yakiwara H, Asano Y, Shimizu H, Uchida K, Hirano S, Umakoshi K, Miyamachi H, Nakamoto M, Fukui M, Kamizono M, Kanehara H, Yamada T, Shinohara M, Obara K. Migrating tremor off southern Kyushu as evidence for slow slip of a shallow subduction interface. Science 2015; 348:676-9. [DOI: 10.1126/science.aaa4242] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Accepted: 03/30/2015] [Indexed: 11/02/2022]
Affiliation(s)
- Y. Yamashita
- Institute of Seismology and Volcanology (SEVO), Faculty of Sciences, Kyushu University, 2-5643-29 Shin’yama, Shimabara 855-0843, Japan
| | - H. Yakiwara
- Nansei-Toko Observatory for Earthquakes and Volcanoes, Graduate School of Science and Engineering, Kagoshima University, 10861 Yoshino-cho, Kagoshima 892-0871, Japan
| | - Y. Asano
- National Research Institute for Earth Science and Disaster Prevention, 3-1 Tennodai, Tsukuba 305-0006, Japan
| | - H. Shimizu
- Institute of Seismology and Volcanology (SEVO), Faculty of Sciences, Kyushu University, 2-5643-29 Shin’yama, Shimabara 855-0843, Japan
| | - K. Uchida
- Institute of Seismology and Volcanology (SEVO), Faculty of Sciences, Kyushu University, 2-5643-29 Shin’yama, Shimabara 855-0843, Japan
| | - S. Hirano
- Nansei-Toko Observatory for Earthquakes and Volcanoes, Graduate School of Science and Engineering, Kagoshima University, 10861 Yoshino-cho, Kagoshima 892-0871, Japan
| | - K. Umakoshi
- Graduate School of Fisheries Science and Environmental Studies, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - H. Miyamachi
- Nansei-Toko Observatory for Earthquakes and Volcanoes, Graduate School of Science and Engineering, Kagoshima University, 10861 Yoshino-cho, Kagoshima 892-0871, Japan
| | - M. Nakamoto
- Institute of Seismology and Volcanology (SEVO), Faculty of Sciences, Kyushu University, 2-5643-29 Shin’yama, Shimabara 855-0843, Japan
| | - M. Fukui
- Institute of Seismology and Volcanology (SEVO), Faculty of Sciences, Kyushu University, 2-5643-29 Shin’yama, Shimabara 855-0843, Japan
| | - M. Kamizono
- Institute of Seismology and Volcanology (SEVO), Faculty of Sciences, Kyushu University, 2-5643-29 Shin’yama, Shimabara 855-0843, Japan
| | - H. Kanehara
- Faculty of Fisheries, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - T. Yamada
- Earthquake Research Institute (ERI), The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
| | - M. Shinohara
- Earthquake Research Institute (ERI), The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
| | - K. Obara
- Earthquake Research Institute (ERI), The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
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Hammerschmidt SB, Wiersberg T, Heuer VB, Wendt J, Erzinger J, Kopf A. Real-time drilling mud gas monitoring for qualitative evaluation of hydrocarbon gas composition during deep sea drilling in the Nankai Trough Kumano Basin. GEOCHEMICAL TRANSACTIONS 2014; 15:15. [PMID: 25648878 PMCID: PMC4302130 DOI: 10.1186/s12932-014-0015-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Accepted: 11/24/2014] [Indexed: 05/27/2023]
Abstract
BACKGROUND Integrated Ocean Drilling Program Expedition 338 was the second scientific expedition with D/V Chikyu during which riser drilling was conducted as part of the Nankai Trough Seismogenic Zone Experiment. Riser drilling enabled sampling and real-time monitoring of drilling mud gas with an onboard scientific drilling mud gas monitoring system ("SciGas"). A second, independent system was provided by Geoservices, a commercial mud logging service. Both systems allowed the determination of (non-) hydrocarbon gas, while the SciGas system also monitored the methane carbon isotope ratio (δ(13)CCH4). The hydrocarbon gas composition was predominated by methane (> 1%), while ethane and propane were up to two orders of magnitude lower. δ(13)CCH4 values suggested an onset of thermogenic gas not earlier than 1600 meter below seafloor. This study aims on evaluating the onboard data and subsequent geological interpretations by conducting shorebased analyses of drilling mud gas samples. RESULTS During shipboard monitoring of drilling mud gas the SciGas and Geoservices systems recorded up to 8.64% and 16.4% methane, respectively. Ethane and propane concentrations reached up to 0.03 and 0.013%, respectively, in the SciGas system, but 0.09% and 0.23% in the Geoservices data. Shorebased analyses of discrete samples by gas chromatography showed a gas composition with ~0.01 to 1.04% methane, 2 - 18 ppmv ethane, and 2 - 4 ppmv propane. Quadruple mass spectrometry yielded similar results for methane (0.04 to 4.98%). With δD values between -171‰ and -164‰, the stable hydrogen isotopic composition of methane showed little downhole variability. CONCLUSIONS Although the two independent mud gas monitoring systems and shorebased analysis of discrete gas sample yielded different absolute concentrations they all agree well with respect to downhole variations of hydrocarbon gases. The data point to predominantly biogenic methane sources but suggest some contribution from thermogenic sources at depth, probably due to mixing. In situ thermogenic gas production at depths shallower 2000 mbsf is unlikely based on in situ temperature estimations between 81°C and 85°C and a cumulative time-temperature index of 0.23. In conclusion, the onboard SciGas data acquisition helps to provide a preliminary, qualitative evaluation of the gas composition, the in situ temperature and the possibility of gas migration.
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Affiliation(s)
| | - Thomas Wiersberg
- />GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Germany
| | - Verena B Heuer
- />MARUM, University of Bremen, Leobener Str., Bremen, 28359 Germany
| | - Jenny Wendt
- />MARUM, University of Bremen, Leobener Str., Bremen, 28359 Germany
| | - Jörg Erzinger
- />GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Germany
| | - Achim Kopf
- />MARUM, University of Bremen, Leobener Str., Bremen, 28359 Germany
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Umeda K, Kusano T, Asamori K, McCrank GF. Relationship between3He/4He ratios and subduction of the Philippine Sea plate beneath southwest Japan. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2012jb009409] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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11
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Shibazaki B, Obara K, Matsuzawa T, Hirose H. Modeling of slow slip events along the deep subduction zone in the Kii Peninsula and Tokai regions, southwest Japan. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011jb009083] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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13
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Sekine S, Hirose H, Obara K. Along-strike variations in short-term slow slip events in the southwest Japan subduction zone. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2008jb006059] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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15
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Obara K. Phenomenology of deep slow earthquake family in southwest Japan: Spatiotemporal characteristics and segmentation. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2008jb006048] [Citation(s) in RCA: 130] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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Striations, duration, migration and tidal response in deep tremor. Nature 2010; 466:356-9. [DOI: 10.1038/nature09251] [Citation(s) in RCA: 144] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2010] [Accepted: 06/01/2010] [Indexed: 11/08/2022]
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17
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Hirose H, Obara K. Recurrence behavior of short-term slow slip and correlated nonvolcanic tremor episodes in western Shikoku, southwest Japan. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2008jb006050] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Shibazaki B, Bu S, Matsuzawa T, Hirose H. Modeling the activity of short-term slow slip events along deep subduction interfaces beneath Shikoku, southwest Japan. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2008jb006057] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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19
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Loveless JP, Meade BJ. Geodetic imaging of plate motions, slip rates, and partitioning of deformation in Japan. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2008jb006248] [Citation(s) in RCA: 224] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Ito Y, Obara K, Matsuzawa T, Maeda T. Very low frequency earthquakes related to small asperities on the plate boundary interface at the locked to aseismic transition. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008jb006036] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yoshihiro Ito
- Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science; Tohoku University; Sendai Japan
- National Research Institute for Earth Science and Disaster Prevention; Tsukuba Japan
| | - Kazushige Obara
- National Research Institute for Earth Science and Disaster Prevention; Tsukuba Japan
| | - Takanori Matsuzawa
- National Research Institute for Earth Science and Disaster Prevention; Tsukuba Japan
| | - Takuto Maeda
- National Research Institute for Earth Science and Disaster Prevention; Tsukuba Japan
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21
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Shiomi K, Park J. Structural features of the subducting slab beneath the Kii Peninsula, central Japan: Seismic evidence of slab segmentation, dehydration, and anisotropy. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jb005535] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Hirose F, Nakajima J, Hasegawa A. Three-dimensional seismic velocity structure and configuration of the Philippine Sea slab in southwestern Japan estimated by double-difference tomography. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jb005274] [Citation(s) in RCA: 199] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Ikuta R, Tadokoro K, Ando M, Okuda T, Sugimoto S, Takatani K, Yada K, Besana GM. A new GPS-acoustic method for measuring ocean floor crustal deformation: Application to the Nankai Trough. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2006jb004875] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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24
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Ozawa S, Suito H, Imakiire T, Murakmi M. Spatiotemporal evolution of aseismic interplate slip between 1996 and 1998 and between 2002 and 2004, in Bungo channel, southwest Japan. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jb004643] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Affiliation(s)
- John Townend
- School of Earth Sciences; Victoria University of Wellington; Wellington New Zealand
| | - Mark D. Zoback
- Department of Geophysics; Stanford University; Stanford California USA
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Miyazaki S, Segall P, McGuire JJ, Kato T, Hatanaka Y. Spatial and temporal evolution of stress and slip rate during the 2000 Tokai slow earthquake. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2004jb003426] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Shin'ichi Miyazaki
- Department of Geophysics; Stanford University; Stanford California USA
- Earthquake Research Institute; University of Tokyo; Tokyo Japan
| | - Paul Segall
- Department of Geophysics; Stanford University; Stanford California USA
| | | | - Teruyuki Kato
- Earthquake Research Institute; University of Tokyo; Tokyo Japan
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Dong D, Fang P, Bock Y, Webb F, Prawirodirdjo L, Kedar S, Jamason P. Spatiotemporal filtering using principal component analysis and Karhunen-Loeve expansion approaches for regional GPS network analysis. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005jb003806] [Citation(s) in RCA: 183] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- D. Dong
- Jet Propulsion Laboratory; California Institute of Technology; Pasadena California USA
| | - P. Fang
- Institute of Geophysics and Planetary Physics; Scripps Institution of Oceanography; La Jolla California USA
| | - Y. Bock
- Institute of Geophysics and Planetary Physics; Scripps Institution of Oceanography; La Jolla California USA
| | - F. Webb
- Jet Propulsion Laboratory; California Institute of Technology; Pasadena California USA
| | - L. Prawirodirdjo
- Institute of Geophysics and Planetary Physics; Scripps Institution of Oceanography; La Jolla California USA
| | - S. Kedar
- Jet Propulsion Laboratory; California Institute of Technology; Pasadena California USA
| | - P. Jamason
- Institute of Geophysics and Planetary Physics; Scripps Institution of Oceanography; La Jolla California USA
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28
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Mazzotti S, James TS, Henton J, Adams J. GPS crustal strain, postglacial rebound, and seismic hazard in eastern North America: The Saint Lawrence valley example. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2004jb003590] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Stéphane Mazzotti
- Geological Survey of Canada; Pacific Geoscience Centre; Sidney, British Columbia Canada
| | - Thomas S. James
- Geological Survey of Canada; Pacific Geoscience Centre; Sidney, British Columbia Canada
| | - Joe Henton
- Natural Resources Canada; Geodetic Survey Division; Ottawa, Ontairo Canada
| | - John Adams
- Geological Survey of Canada; Ottawa, Ontario Canada
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Aoki Y, Scholz CH. Interseismic deformation at the Nankai subduction zone and the Median Tectonic Line, southwest Japan. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2003jb002441] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yosuke Aoki
- Lamont-Doherty Earth Observatory of Columbia University; Palisades New York USA
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30
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Affiliation(s)
- Yosuke Aoki
- Lamont-Doherty Earth Observatory of Columbia University; Palisades New York USA
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31
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Dominguez S, Avouac JP, Michel R. Horizontal coseismic deformation of the 1999 Chi-Chi earthquake measured from SPOT satellite images: Implications for the seismic cycle along the western foothills of central Taiwan. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2001jb000951] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Stéphane Dominguez
- Laboratoire de Détection et de Géophysique; Commissariat à l'Energie Atomique; Bruyères-le-Châtel France
| | - Jean-Philippe Avouac
- Laboratoire de Détection et de Géophysique; Commissariat à l'Energie Atomique; Bruyères-le-Châtel France
| | - Rémi Michel
- Laboratoire de Détection et de Géophysique; Commissariat à l'Energie Atomique; Bruyères-le-Châtel France
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32
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Mazzotti S. Current tectonics of northern Cascadia from a decade of GPS measurements. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2003jb002653] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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33
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Heki K. Seasonal modulation of interseismic strain buildup in northeastern Japan driven by snow loads. Science 2001; 293:89-92. [PMID: 11441179 DOI: 10.1126/science.1061056] [Citation(s) in RCA: 100] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Distinct periodic variations with annual frequencies are often found in the time series of continuous Global Positioning System (GPS) site coordinates in northeastern Japan. They show maximum arc-normal contraction of a few millimeters as well as maximum subsidence of 1 to 2 centimeters, both in March. In northeastern Japan, it snows heavily on the western flank of the backbone range, attaining a maximum depth of several meters in March. When observed snow depths were compared with the load distribution estimated from the GPS data, the surface loads caused by the snow were found to be largely responsible for the annual displacement of GPS sites. The snow load modulates secular strain buildup in northeastern Japan due to the Pacific Plate subduction, but its relevance to the seasonal change of earthquake occurrences remains uncertain.
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Affiliation(s)
- K Heki
- Division of Earth Rotation, National Astronomical Observatory, 2-12 Hoshigaoka, Mizusawa, Iwate 023-0861, Japan.
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