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I'm a seismologist working on the earthquake rupture process, which includes the initation, evolution and termination of an earthquake. In the recorded history, the largest earthquakes, for instance the 2004 Sumatra Mw 9.2, the 1960 Great Chilean Mw 9.4, the 1964 Alaskan Mw 9.3, and the 2011 Tohoku Mw 9.0 megathrust earthquakes, have killed many, caused great damage, and brought tremendous financial losses. These earthquakes induce not only strong ground motion but also large tsunami waves. As populations grows, especially in the coastal regions where large earthquakes usually occur, mitigating the earthquake hazards is critical. During large earthquakes, the building collapse caused by ground motion as well as coastal destruction caused by huge tsunami waves are deadliest to human. Both of them are directly controlled by the earthquake source and their mitigation requires sufficient knowledge about the physics of the earthquake rupture. Different processes in the rupture, such as the direction of propagation, energy participation or surrounding structure may incur locally different ground motion. Therefore, further understanding the rupture during large earthquake is of not only scientific significance but also important to mitigate seismic hazards. My research aims at better interpreting the physics behind a destructive earthquake and helps to mitigate the damages caused by earthquakes.