National Earthquake Infrastructure Services

Beijing, China

National Earthquake Infrastructure Services

Beijing, China
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Lian W.-P.,China Earthquake Administration | Tang F.-T.,China Earthquake Administration | Li L.,China Earthquake Administration | Wang Y.-B.,National Earthquake Infrastructure Services | Chen W.-T.,National Earthquake Infrastructure Services
Chinese Journal of Geophysics (Acta Geophysica Sinica) | Year: 2014

Thrust rupture is the initial and main course of the 2008 Wenchuan MS8.0 earthquake. Its distribution on the causative fault plane with depth is inconsistent with most thrust earthquakes of plate interiors. Through numerical experiments, this work analyzes the influences of the source at the bottom, near-surface fault dipping angles and previous earthquakes on such distribution. The results show that under the intense compression from the Bayan Hara block in the northwest, the listric near-surface fault surface hampers the rupture and slip of the Wenchuan event to some extent. That the ruptures of previous thrust quakes are concentrated in the middle portion of the fault is one of the possible reasons for that the slip distribution of the 2008 Wenchuan event is different from most intraplate quakes of thrust type.


Lian W.,National Earthquake Infrastructure Services | Li L.,China Earthquake Administration | Tang F.,China Earthquake Administration | Hu B.,National Earthquake Infrastructure Services | Li X.,National Earthquake Infrastructure Services
Acta Seismologica Sinica | Year: 2014

This paper constructs a finite element analysis (FEA) method for the numerical simulation of characteristic earthquakes, based on the wide-accepted knowledge of the shallow crustal structure and dynamic boundary conditions at the middle part of the Longmenshan fault zone. The influence of parallel thrust faults on regional seismic activity is focused on and simulated with this FEA model. The results show that the characteristic earthquake model with strict recurrence interval is not suitable for the entire fault zone which contains three parallel faults. When the distance between the faults is less than 20 km, the applicability of the characteristic earthquake model to each single fault is attenuated with the distance between the faults decreasing. The results based on the distribution pattern of the profile in the middle of the Longmenshan fault zone reveal that seismic activity of the back range fault is relatively independent, and the characteristic earthquake model with strict recurrence interval is not suitable for the entire fault zone and the central fault. ©, 2014, Acta Seismologica Sinica Press. All right reserved.

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