The far reach of megathrust earthquakes: Evolution of stress, deformation and seismicity following the 2004 Sumatra-Andaman rupture

Cumulative transient motions 60 years after 2004 earthquake, calculated using a laterally homogeneous Maxwell rheology

Project Summary The December 26, 2004 Sumatra-Andaman event was the largest earthquake since the 1960s and the first Mw 9.2 event to occur in the era of modern space geodesy and broadband seismology. It produced measurable static surface displacements at distances as large as 4500 km [e.g., Banerjee et al., 2007]. Three months later, it was followed by a second great Mw 8.7 event on an adjoining segment of the subduction zone. These infrequent events provide the rare opportunity to fundamentally improve our understanding of the earthquake cycle of megathrust ruptures and the constitutive properties of the adjoining oceanic and continental crust and upper mantle. Far-reaching deformation and stress transients following these events will impact other faults in the region for decades to come, and either enhance or diminish their likelihood to rupture. We seek as complete an understanding as possible of the processes contributing to this deformation and the resulting stress and seismicity changes throughout southeast Asia.

Tools ***tools***

Geographic Location Southeast Asia

Group Members Involved Kelly Grijalva <Email> <Personal Web Site>
Roland Bürgmann

Project Duration 2006-present

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