Investigation on the effect of along-strike variation of seismogenic width on earthquake ruptures
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AbstractWe use 3D dynamic finite element models to investigate the effect of along-strike variation of seismogenic width on earthquake ruptures. Seismogenic width has a significant effect on rupture propagation and final earthquake size, which are crucial on seismic hazard assessment and mitigation. Former studies have revealed that larger seismogenic width lead to larger aspect ratio, i. e. longer fault fracture, and even produce “breakaway” rupture when the seismogenic width reaching a critical value. However, in a real fault, the seismogenic width is not uniform along the whole fault; more commonly the fault width shows along-strike variation in different fault segments. In this study, we use the finite element code PyLith (Aagaard et al., 2013) to simulate the rupture process on strike-slip faults with varying seismogenic width and compare the ground motion of “self-arresting” rupture and “breakaway” rupture. Preliminary results from models show that for a fault model with varying seismogenic width, ruptures tend to develop in the side with wider seismogenic zone; earthquakes initiate at different positions will produce different rupture size and cause different loss and hazard. Comparing the ground motion signal of self-arresting and breakaway rupture help us to know deeper about breakaway rupture, and one day recognize the breakaway earthquakes immediately from surface seismic station record then reduce the loss and casualties.
All Author(s) ListCHEN Xiang, YANG Hongfeng, WENG Huihui
Name of ConferenceWorkshop: Frontiers in Studies of Earthquakes and Faults
Start Date of Conference27/11/2017
End Date of Conference01/12/2017
Place of ConferenceShenzhen
Country/Region of ConferenceChina
LanguagesEnglish-United States

Last updated on 2018-04-05 at 12:48