Precursory Characteristics of Meta-Instability of Cross-Fault Deformation Before the Lushan Ms 7.0 Earthquake

ZHANG Xi; LIU Xia; QIN Shanlan; JIA Peng

doi:10.13203/j.whugis20190467

Volume 45 Issue 11

Nov. 2020

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Geomatics and Information Science of Wuhan University > 2020 > 45(11): 1669-1677. > DOI: 10.13203/j.whugis20190467

ZHANG Xi, LIU Xia, QIN Shanlan, JIA Peng. Precursory Characteristics of Meta-Instability of Cross-Fault Deformation Before the Lushan Ms 7.0 Earthquake[J]. Geomatics and Information Science of Wuhan University, 2020, 45(11): 1669-1677. DOI: 10.13203/j.whugis20190467

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Precursory Characteristics of Meta-Instability of Cross-Fault Deformation Before the Lushan Ms 7.0 Earthquake

1.
The Second Monitoring and Application Center, China Earthquake Administration, Xi'an 710054, China
2.
The First Monitoring and Application Center, China Earthquake Administration, Tianjin 300180, China

Funds:

The National Key Research and Development Program of China 2018YFC150330506

Earthquake Tracking Project of China Earthquake Administration 2021020509

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Author Bio:
ZHANG Xi, professor, specializes in crustal deformation and geodynamics. E-mail: 486408007@qq.com
Received Date: December 18, 2019
Published Date: November 18, 2020

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Abstract

Abstract

Objectives The Lushan Ms 7.0 earthquake on April 20, 2013, occurred in the southern segment of the Longmenshan fault, which is the boundary zone of collision and compression between the Bayan Har block and the South China block. Within a few months before the earthquake, the Baoxing mobile cross-fault short-leveling site in the seismogenic fault displayed thrust accelerating, 25 km from the epicenter; the quasi-synchronous compressive turning was observed in the adjacent Xianshuihe fault, Zhuwo, Xuxu, Goupu, Longdengba, Laoqianning mobile cross-fault comprehensive sites for baseline and leveling, and the Xuxu and Longdengba sites also showed right-lateral turning, 147-295 km from the epicenter. We attempt to explore the mechanism of these abnormal phenomena and its relationship with the Lushan earthquake.
Methods Based on analysis of the spatio temporal evolution of mobile cross-fault deformation within the radius of 300 km around the epicenter where above sites are located, combined with continuous GPS, satellite remote sensing, well water level, seismic activities and other auxiliary data, the precursory characteristics of meta-instability of cross-fault deformation before the Lushan Ms 7.0 earthquake is discussed.
Results Over six months before the earthquake, the "inherited" fault activity which was conducive to stress accumulation slowed down obviously at first, deviating from linear variation, later changed to reverse inheritance state. Three months before the earthquake it was observed that, the "reverse" anomalies (contrary to the tectonic setting) of the Xianshuihe fault adjacent to the earthquake area increased and strengthened, the compressive turning obviously accelerated, the temporal variation of tension-compression component of grey correlation index was similar to the stress-time process obtained from the meta-instability experiment; the "reverse" change sites of the Longmenshan fault also increased significantly (at the same time, there existed Baoxing anomaly that may be related to pre-slip of the seismogenic fault). Moreover, the auxiliary data containing continuous GPS, satellite remote sensing, well water level and seismic activities also had supporting evidences.
Conclusions All of above showed characteristics of fault activities synergism and acceleration. It was very likely to be the precursor performance of meta-instability before the Lushan earthquake.
- the Lushan large earthquake,
- cross-fault deformation,
- meta-instable precursor

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