Browsing by Author "González, Gabriel"

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    Coseismic slip and afterslip of the 2015 Mw 8.3 Illapel (Chile) earthquake determined from continuous GPS data
    (John Wiley & Sons Ltd., 2016) Shrivastava, Mahesh N.; González, Gabriel; Moreno, Marcos; Chlieh, Mohamed; Salazar, Pablo; Reddy, C.D.; Báez, Juan Carlos; Yanez Carrizo Gonzalo Alejandro; González, Juan; De La Llera Martin Juan Carlos; Pontificia Universidad Católica de Chile. National Research Center for Integrated Natural Disaster Management
    We analyzed the coseismic and early postseismic deformation of the 2015, M-w 8.3 Illapel earthquake by inverting 13 continuous GPS time series. The seismic rupture concentrated in a shallow (<20km depth) and 100km long asperity, which slipped up to 8m, releasing a seismic moment of 3.6x10(21)Nm (M-w=8.3). After 43days, postseismic afterslip encompassed the coseismic rupture. Afterslip concentrated in two main patches of 0.50m between 20 and 40km depth along the northern and southern ends of the rupture, partially overlapping the coseismic slip. Afterslip and aftershocks confined to region of positive Coulomb stress change, promoted by the coseismic slip. The early postseismic afterslip was accommodated similar to 53% aseismically and similar to 47% seismically by aftershocks. The Illapel earthquake rupture is confined by two low interseismic coupling zones, which coincide with two major features of the subducting Nazca Plate, the Challenger Fault Zone and Juan Fernandez Ridge.
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    Earthquake damage assessment for deterministic scenarios in Iquique, Chile
    (2018) Aguirre Aparicio, Paula; Vásquez P., Jorge; Llera Martin, Juan Carlos de la; González, Juan; González, Gabriel
    Risk evaluation and loss analysis is key in foreseeing the impact of disasters caused by natural hazards and may contribute effectively in improving resilience in a community through the pre-evaluation of preparedness and mitigation actions. The pilot study presented herein is for the Chilean city of Iquique, which is located at the core of a seismic gap that extends from south Perú to north Chile, and has strategic geopolitical and economic importance for the country. The region was hit April 1, 2014, by an Mw 8.2 earthquake that caused only moderate damage, but seismological evidence suggests that there is still a potential for a much larger event in the region. Therefore, a careful damage assessment study is fundamental to anticipate the possible physical, social, and economic consequences that Iquique may face in the future. In this work, the HAZUS-MH platform was adapted and used to simulate a set of ten plausible physics-based future seismic scenarios with magnitudes ranging from Mw 8.40 to Mw 8.98, which were proposed based on an analysis of interplate locking and the residual slip potential remaining after the April 1, 2014, earthquake. Successful application of this damage assessment methodology relies on the construction of a comprehensive exposure model that takes into account regional features and a good characterization of the physical vulnerabilities. For Iquique, a large body of public and local data was used to develop a detailed inventory of physical and social assets including an aggregated building count, demographics, and essential facilities. To characterize the response of the built environment to seismic demand, appropriate HAZUS fragility curves were applied, and outcomes were validated against the damage observed in the 2014 earthquake. After satisfactory testing, a deterministic earthquake damage assessment study was carried out for the collection of predictive scenarios aimed to estimate their expected impacts. This analysis provides data for future evaluations of different physical and social mitigation measures for the city.
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    Fault-fluid interaction in porphyry copper hydrothermal systems : faulted veins in radomiro Tomic, northern Chile
    (2019) Jensen, Erik; González, Gabriel; Faulkner, Daniel R.; Cembrano, José; Mitchell, Thomas
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    Permanent fore-arc extension and seismic segmentation : Insights from the 2010 Maule earthquake, Chile
    (2013) Aron, Felipe; Allmendinger, Richard W.; Cembrano, José; González, Gabriel; Yáñez Carrizo, Gonzalo Alejandro
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    The 1 April 2014 Pisagua tsunami : observations and modeling
    (2015) Catalán, Patricio A.; Aránguiz, Rafael; González, Gabriel; Tomita, Takashi; Cienfuegos Carrasco, Rodrigo Alberto; González, Juan; Shrivastava, Mahesh N.; Kumagai, Kentaro; Mokrani, Cyril; Cortés, Pablo; Gubler, Alejandra
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    Upper plate reverse fault reactivation and the unclamping of the megathrust during the 2014 northern Chile earthquake sequence
    (2015) González, Gabriel; Salazar, Pablo; Loveless, John P.; Allmendinger, Richard W.; Aron Melo, Felipe Alejandro; Shrivastava, Mahesh