Journal of Geophysical Research - Oceans, doi: 10.1029/2012JC008257, 2012
Title: Atmospheric infrasound from nonlinear wave interactions during Hurricanes Felicia and Neki of 2009
Authors: Justin E. Stopa and Kwok Fai Cheung: Department of Ocean and Resources Engineering, University of Hawaii at Manoa, Honolulu, Hawaii, USA;
Milton A. Garcs and Nickles Badger: Hawaii Institute of Geophysics and Planetology, University of Hawaii at Manoa, Kailua-Kona, Hawaii, USA.
6. Aftershocks to Philippine quake found within nearby megathrust fault
On 31 August 2012 a magnitude 7.6 earthquake ruptured deep beneath the sea floor of the Philippine Trench, a powerful intraplate earthquake centered seaward of the plate boundary. In the wake of the main shock, sensors detected a flurry of aftershocks, counting 110 in total. Drawing on seismic wave observations and rupture mechanisms calculated for the aftershocks, Ye et al. find that many were located near the epicenter of the main intraplate quake, but at shallower depth and all involving normal faulting. Some shallow thrusting aftershocks were located farther to the west, centered within the potentially dangerous megathrust fault formed by the subduction of the Philippine Sea plate beneath the Philippine Microplate, the piece of crust housing the Philippine Islands.
In the past century, the most powerful earthquakes have occurred within megathrust faults. The particular portion of the megathrust fault nearest to the 31 August intraplate earthquake, and the section that housed the shallow thrusting aftershocks, have not had a strong earthquake since at least 1600. That aftershocks from the main intraplate shock took place within the interplate boundary suggests that the t
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