Publication Date:
2017-05-20
Description:
A 160-km-long seismic gap, which has not been ruptured over ~8000 year, was identified recently in North China. In this study, we use a dynamic source model and a newly available high-resolution 3-D velocity structure to simulate long period ground motion (up to 0.5 Hz) from possibly worst-case rupture scenarios of the seismic gap. We find that the characteristics of the earthquake source and the local geologic structure play a critical role in controlling the amplitude and distribution of the simulated strong ground shaking. Rupture directivity and slip asperities can result in large amplitude (i.e., 〉1 m/s) ground shaking near the fault, whereas long duration shaking may occur within sedimentary basins. In particular, a deep and closed Quaternary basin between Beijing and Tianjin can lead to ground shaking of several tens of cm/s for more than 1 minute. These results may provide a sound basis for seismic mitigation in one of the most populated regions in the world.
Print ISSN:
0094-8276
Electronic ISSN:
1944-8007
Topics:
Geosciences
,
Physics
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