3D modeling of earthquake cycles of the Xianshuihe fault,southwestern China |
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| Institution: | 1. School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan 430079, China;2. China Earthquake Networks Center, No. 5, Nanheng Street, Sanlihe, Xicheng District, Beijing 100045, China;3. International Institute of Seismology and Earthquake Engineering, Building Research Institute, Tsukuba, Japan;1. Institute of Earth Sciences, Academia Sinica, 128 Academia Road, Sec. 2, Nangang, Taipei 11529, Taiwan;2. Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China;1. Department of Geosciences, National Taiwan University, Taipei, Taiwan;2. Earth Observatory of Singapore, Nanyang Technological University, Singapore;1. Institute for Surgical Technology and Biomechanics (ISTB), The University of Bern, Stauffacherstrasse 78, 3014 Bern, Switzerland;2. The University of Western Ontario, London, ON, Canada;3. The Digital Imaging Group of London, London, ON, Canada;4. Lawson Health Research Institute, London, ON, Canada;1. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China;2. HKU Shenzhen Institute of Research and Innovation, Shenzhen, China;3. Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;4. Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090, Russia;5. Novosibirsk State University, Novosibirsk 630090, Russia |
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| Abstract: | We perform 3D modeling of earthquake generation of the Xianshuihe fault, southwestern China, which is a highly active strike-slip fault with a length of about 350 km, in order to understand earthquake cycles and segmentations for a long-term forecasting and earthquake nucleation process for a short-term forecasting. Historical earthquake data over the last 300 years indicates repeated periods of seismic activity, and migration of large earthquake along the fault during active seismic periods. To develop the 3D model of earthquake cycles along the Xianshuihe fault, we use a rate- and state-dependent friction law. After analyzing the result, we find that the earthquakes occur in the reoccurrence intervals of 400–500 years. Simulation result of slip velocity distribution along the fault at the depth of 10 km during 2694 years along the Xianshuihe fault indicates that since the third earthquake cycle, the fault has been divided into 3 parts. Some earthquake ruptures terminate at the bending part of the fault line, which may means the shape of the fault line controls how earthquake ruptures. The change of slip velocity and displacement at 10 km depth is more tremendous than the change of the shallow and deep part of the fault and the largest slip velocity occurs at the depth of 10 km which is the exact depth of the seismic zone where fast rupture occurs. |
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| Keywords: | The Xianshuihe fault Earthquake cycle Rate- and state-dependent friction law |
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