Analysis of Seismicity Associated with the Mw=8.8 2010 Maule (Chile) Earthquake and Implications for Subduction Processes
collaborative with Susan Beck University of Arizona, Steve Roecker RPI, Ray Russo University of Florida.
On February 27, 2010, the Mw=8.8 Maule earthquake struck off the coast of south central Chile rupturing nearly 600 km of the Nazca-South American plate boundary. Over 11 million people in Santiago, Valparaiso, Concepcion, and the surrounding towns and countryside experienced moderate to strong ground shaking. The earthquake generated a tsunami that was locally damaging and contributed to many of the fatalities. Through planning, preparation, and local/national emergency response, the loss of life and damage was minimized although still tragic and significant: 521 lives were lost, ~800,000 people were displaced, and the economic impact exceeded $30 billion, 17% of the country’s GDP.
International Maule Aftershock Deployment (IMAD).
Immediately following the Maule earthquake, teams of seismologists from Chile, France, Germany, Great Britain, and the United States mobilized, coordinating resources to capture aftershocks and other seismic signals associated with this great earthquake. In total, 164 instruments, 91 broadband, 48 short period, and 25 accelerometers were deployed above the rupture zone of the mainshock from 33°-38.5°S and from the coast to the Andean front. The resulting International Maule Aftershock Deployment (IMAD) captures one of the best ever recorded aftershock sequences in the wake of a great megathrust, second only to the 2011 Tohoku aftershock sequence.Having participated in the collection of this community data set we are now using IMAD data to investigate processes associated with great earthquakes and to image the anatomy of a subduction zone.
Hayes, Gavin P., Bergman, Eric A., Benz, Harley, Brown, Lucy, Meltzer, Anne, Seismotectonic Framework of the Feb 27, 2010 Mw 8.8 Maule, Chile Earthquake Sequence Abstract S24A-04, presented at the 2012 Fall Meeting, AGU, San Francisco, Calif., 3-7 Dec.
Anne Meltzer, Harley Benz, Lucy Brown, Raymond M. Russo, Susan L. Beck, Steven W. Roecker, 2011, The Mw=8.8 Maule earthquake aftershock sequence, event catalog and locations, Abstract S11A-2193 presented at 2011 Fall Meeting, AGU, San Francisco, Calif., 5-9 Dec.
Mallory Morell, Susan L. Beck, Steven W. Roecker, Anne Meltzer, Raymond M. Russo, 2011, Receiver Function Migration of Broadband Seismograms recorded by the International Maule Aftershock Deployment (IMAD) in Central Chile, Abstract S11A-2203 presented at 2011 Fall Meeting, AGU, San Francisco, Calif., 5-9 Dec.
Meltzer, A, Beck, S, Roecker, S, Russo, R, Simpson, D, Barrientos, S, Comte, D, Pardo, M, Ruiz, J, Aranda, C, Slad, G, Greschke, B, Barstow, N, Bonnet, B, Reusch, A, Bataille, K, Cabello, O, Velasco, A, Ebeling, C, Tilmann, F, Vilotte, J, Rietbrock, A, Heit, B, Schurr, B, Lange, D, 2010, IRIS Community Response to the Great Chile Earthquake of 2010, Abstract G33A-0811, presented at 2010 Fall Meeting, AGU, San Francisco, Calif., 13-17 Dec.