Contact: Barbara Wilcox
United States Geological Survey
Caption: Some 380 seconds into the greatest earthquake to rupture since 1960, the simulated dynamic Coulomb stress waves (red-blue) shed continuously off the 2004 M=9.2 Sumatra rupture front can be seen sweeping through the Andaman Sea, where faults remarkably shut down for the next five years. Earthquakes since 1964 are shown as black dots, and the Sunda trench along which the 1400-km-long earthquake occurred is the arcuate black line on the left (west). Sumatra is on the right, and Myanmar/Burma is at top. Sevilgen et al (Proc. Nat. Acad. Sci, 2012) find that despite the magnitude of thesedynamic stress waves, the much smaller permanent stresses account for the change in seismicity after the main shock. This graphic accompanies the Sept. 3, 2012 article in Proceedings of the National Academy of Sciences by Volkan Sevilgen, Ross Stein and Fred Pollitz.
Credit: U.S. Geological Survey
Usage Restrictions: None
Related news release: Rare great earthquake in April triggers large aftershocks all over the globe