The April 1, 2014 Pisagua (Mw 8.2) Northern Chile Earthquake Seismo-Geodetic Intervention

Wednesday, 17 December 2014: 1:40 PM
Francisco H Ortega Culaciati1, Daniel Carrizo2, Edmundo O Norabuena3, Diana Comte1, Jorge Jara4, Eduardo Contreras Reyes1, Mohamed Chlieh5, Arthur Delorme6, Joachim F Genrich7, Emilie Klein8, Marcos Moreno9, Ismael Ortega10, Sophie Peyrat11, Efrain Rivera1, Sergio Ruiz1, MariaCarolina Valderas Bermejo10, Klaus Dieter Bataille12, Mark Simons7, Anne Socquet4, Christophe Vigny13 and Jean-Pierre Vilotte6, (1)University of Chile, Department of Geophysics, Santiago, Chile, (2)Universidad de Chile, Advanced Mining and Technology Center, Santiago, Chile, (3)Instituto Geofísico del Perú, Lima, Peru, (4)ISTerre Institute of Earth Sciences, Saint Martin d'Hères, France, (5)Geoazur, Valbonne, France, (6)Institut de Physique du Globe de Paris, Paris, France, (7)California Institute of Technology, Pasadena, CA, United States, (8)Ecole Normale Supérieure Paris, Paris, France, (9)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, (10)Universidad de Chile, Centro Sismologico National, Santiago, Chile, (11)Geosciences Montpellier, UMR5242, Universite Montpellier 2, Montpellier, France, (12)Universidad de Concepcion, Concepcion, Chile, (13)ENS/CNRS, Paris, France
The April 1, 2014 Pisagua (Mw 8.2) Earthquake occurred at the Central Andean segment of the Nazca-South American subduction margin, partially rupturing a known seismic gap that has not experienced a great seismic event since the 1868 southern Peru and 1877 northern Chile mega-earthquakes. In a collaborative effort between Chilean/Peruvian/French/German and USA institutions, we performed seismic and geodetic intervention campaigns in response to the Pisagua earthquake, with the ultimate goal of achieving a better understanding of the mechanical properties and physical processes occurring at the subduction zone that control, for instance, the generation of large earthquakes and potential tsunamis. The deployment of the temporary geodetic and seismic instruments complements the spatial distribution of existing permanent GPS and seismic networks on the region. We present estimates of crustal deformation along the seismic gap, from southern Peru to Mejillones peninsula, including the co-seismic displacement field observed at the GPS stations, as well as our preliminary insights on the mechanical behavior of the subduction zone inferred using the available geodetic and seismic observations.