2010 Chile Earthquake Case Study

2698 WordsMay 6, 201311 Pages
Earthquake Case History: 2010 Mw = 8.8 Mega-thrust Earthquake, Maule, Chile 5/2/13 By Travis Eddy 1. Introduction In early 2010 central south Chile experienced a Mw = 8.8 earthquake and large tsunami waves that devastated areas on the Chilean Pacific coast, nearby offshore islands, and areas near the epicenter. In addition to the tsunami, the earthquake had many other geological consequences including aftershocks, terrestrial and submarine land-sliding, elevation changes, and a gravity shift. The purpose of this paper is to discuss and analyze the earthquake, its consequences, the resulting damages, and mitigation. 2. Geologic Setting Figure 1: Profile of area around the epicenter (Moscoso, et.al., 2011) The site of the…show more content…
The most severe impacts were observed on the Chilean coastline adjacent to the epicenter from San Antonio – Tirua, and 670 km offshore on the Juan Fernandez Archipelago (Synolakis, 2011; Yamazaki and Cheung, 2011). The tsunami hit many areas close to the epicenter within 30 minutes of the main event, however due to bathymetry and coastline shape, tsunami directions, impacts, and arrival times vary. (Synolakis, 2011; Yamazaki and Cheung, 2011). For example, Talcahuano Harbor located in The Bay of Concepcion 100 kilometers south of the epicenter experienced an impact from a resonated 129 minute period oscillating wave three hours after the main event (Yamazaki and Cheung, 2011). Resonance such as this occurred in various areas along the Chilean coastline, and was caused by standing and partial standing wave systems produced along the coast due to wave reflection between the continental shelf and the headlands, resulting in radiated tsunami energy to become trapped over the continental margin (Yamazaki and Cheung, 2011). 6. Land sliding The main event caused both terrestrial and submarine land sliding to occur in the area. Around 30 slides were delineated, with a majority of them being submarine (Volker, et.al., 2011). These submarine slides were confined to the walls of various submarine canyons, and were characterized as thin transitional slides retrograding into open slopes adjacent to the canyons (Volker, et.al., 2011). 7. Ground Changes Figure 6:
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