1
|
Yu Z, Hattori K, Zhu K, Chi C, Fan M, He X. Detecting Earthquake-Related Anomalies of a Borehole Strain Network Based on Multi-Channel Singular Spectrum Analysis. ENTROPY (BASEL, SWITZERLAND) 2020; 22:E1086. [PMID: 33286855 PMCID: PMC7597177 DOI: 10.3390/e22101086] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Revised: 09/21/2020] [Accepted: 09/24/2020] [Indexed: 11/25/2022]
Abstract
To investigate the nonlinear spatio-temporal behavior of earthquakes, a complex network has been built using borehole strain data from the southwestern endpoint of the Longmenshan fault zone, Sichuan-Yunnan region of China, and the topological structural properties of the network have been investigated based on data from 2011-2014. Herein, six observation sites were defined as nodes and their edges as the connections between them. We introduced Multi-channel Singular Spectrum Analysis (MSSA) to analyze periodic oscillations, earthquake-related strain, and noise in multi-site observations, and then defined the edges of the network by calculating the correlations between sites. The results of the daily degree centrality of the borehole strain network indicated that the strain network anomalies were correlatable with local seismicity associate with the earthquake energy in the strain network. Further investigation showed that strain network anomalies were more likely to appear before major earthquakes rather than after them, particularly within 30 days before an event. Anomaly acceleration rates were also found to be related to earthquake energy. This study has revealed the self-organizing pre-earthquake phenomena and verified the construction of borehole networks is a powerful tool for providing information on earthquake precursors and the dynamics of complex fault systems.
Collapse
Affiliation(s)
- Zining Yu
- Key Laboratory of Geo-Exploration Instrumentation, Ministry of Education, Jilin University, Changchun 130061, China; (Z.Y.); (C.C.); (M.F.); (X.H.)
- The College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
- Graduate School of Science, Chiba University, Inage, Chiba 263-8522, Japan;
| | - Katsumi Hattori
- Graduate School of Science, Chiba University, Inage, Chiba 263-8522, Japan;
- Center for Environmental Remote Sensing, Chiba University, Inage, Chiba 263-8522, Japan
| | - Kaiguang Zhu
- Key Laboratory of Geo-Exploration Instrumentation, Ministry of Education, Jilin University, Changchun 130061, China; (Z.Y.); (C.C.); (M.F.); (X.H.)
- The College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
| | - Chengquan Chi
- Key Laboratory of Geo-Exploration Instrumentation, Ministry of Education, Jilin University, Changchun 130061, China; (Z.Y.); (C.C.); (M.F.); (X.H.)
- The College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
| | - Mengxuan Fan
- Key Laboratory of Geo-Exploration Instrumentation, Ministry of Education, Jilin University, Changchun 130061, China; (Z.Y.); (C.C.); (M.F.); (X.H.)
- The College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
| | - Xiaodan He
- Key Laboratory of Geo-Exploration Instrumentation, Ministry of Education, Jilin University, Changchun 130061, China; (Z.Y.); (C.C.); (M.F.); (X.H.)
- The College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
| |
Collapse
|
2
|
Deformation Response of Seismogenic Faults to the Wenchuan MS 8.0 Earthquake: A Case Study for the Southern Segment of the Longmenshan Fault Zone. REMOTE SENSING 2018. [DOI: 10.3390/rs10060894] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
3
|
GPS-Derived Fault Coupling of the Longmenshan Fault Associated with the 2008 Mw Wenchuan 7.9 Earthquake and Its Tectonic Implications. REMOTE SENSING 2018. [DOI: 10.3390/rs10050753] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
4
|
Pei S, Zhang H, Su J, Cui Z. Ductile gap between the Wenchuan and Lushan earthquakes revealed from the two-dimensional Pg seismic tomography. Sci Rep 2014; 4:6489. [PMID: 25267344 PMCID: PMC4179461 DOI: 10.1038/srep06489] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Accepted: 09/10/2014] [Indexed: 11/21/2022] Open
Abstract
A high-resolution two-dimensional Pg-wave velocity model is obtained for the upper crust around the epicenters of the April 20, 2013 Ms7.0 Lushan earthquake and the May 12, 2008 Ms8.0 Wenchuan earthquake, China. The tomographic inversion uses 47235 Pg arrival times from 6812 aftershocks recorded by 61 stations around the Lushan and Wenchuan earthquakes. Across the front Longmenshan fault near the Lushan earthquake, there exists a strong velocity contrast with higher velocities to the west and lower velocities to the east. Along the Longmenshan fault system, there exist two high velocity patches showing an “X” shape with an obtuse angle along the near northwest-southeast (NW-SE) direction. They correspond to the Precambrian Pengguan and Baoxing complexes on the surface but with a ~20 km shift, respectively. The aftershock gap of the 2008 Wenchuan and the 2013 Lushan earthquakes is associated with lower velocities. Based on the theory of maximum effective moment criterion, this suggests that the aftershock gap is weak and the ductile deformation is more likely to occur in the upper crust within the gap under the near NW-SE compression. Therefore our results suggest that the large earthquake may be hard to happen within the gap.
Collapse
Affiliation(s)
- Shunping Pei
- Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China
| | - Haijiang Zhang
- Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Jinrong Su
- Seismological Bureau of Sichuan Province, Chengdu 610041, China
| | - Zhongxiong Cui
- Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China
| |
Collapse
|
5
|
Significant isostatic imbalance near the seismic gap between the M8.0 Wenchuan and M7.0 Lushan earthquakes. CHINESE SCIENCE BULLETIN-CHINESE 2014. [DOI: 10.1007/s11434-014-0608-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
6
|
Zhang Z, Wang W, Ren Z, Zhang P, Fang L, Wu J. Lushan M S7.0 earthquake: A special earthquake occurs on curved fault. CHINESE SCIENCE BULLETIN-CHINESE 2013. [DOI: 10.1007/s11434-013-6010-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|