Goce derived geoid changes before the Pisagua 2014 earthquake

The analysis of space – time surface deformation during earthquakes reveals the variable state of stress that occurs at deep crustal levels, and this information can be used to better understand the seismic cycle. Understanding the possible mechanisms that produce earthquake precursors is a key issu...

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Autores principales:	Álvarez Pontoriero, Orlando, Giménez, Mario Ernesto, Folguera Telichevsky, Andrés, Guillen, Sofía, Tocho, Claudia Noemí
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2018
Materias:	Geofísica Satellite gravimetry Pre-seismic geoid changes Great megathrust earthquakes Subduction zones Forecasting and monitoring
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/101268 https://ri.conicet.gov.ar/11336/41366
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-101268
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Geofísica Satellite gravimetry Pre-seismic geoid changes Great megathrust earthquakes Subduction zones Forecasting and monitoring
spellingShingle	Geofísica Satellite gravimetry Pre-seismic geoid changes Great megathrust earthquakes Subduction zones Forecasting and monitoring Álvarez Pontoriero, Orlando Giménez, Mario Ernesto Folguera Telichevsky, Andrés Guillen, Sofía Tocho, Claudia Noemí Goce derived geoid changes before the Pisagua 2014 earthquake
topic_facet	Geofísica Satellite gravimetry Pre-seismic geoid changes Great megathrust earthquakes Subduction zones Forecasting and monitoring
description	The analysis of space – time surface deformation during earthquakes reveals the variable state of stress that occurs at deep crustal levels, and this information can be used to better understand the seismic cycle. Understanding the possible mechanisms that produce earthquake precursors is a key issue for earthquake prediction. In the last years, modern geodesy can map the degree of seismic coupling during the interseismic period, as well as the coseismic and postseismic slip for great earthquakes along subduction zones. Earthquakes usually occur due to mass transfer and consequent gravity variations, where these changes have been monitored for intraplate earthquakes by means of terrestrial gravity measurements. When stresses and correspondent rupture areas are large, affecting hundreds of thousands of square kilometres (as occurs in some segments along plate interface zones), satellite gravimetry data become relevant. This is due to the higher spatial resolution of this type of data when compared to terrestrial data, and also due to their homogeneous precision and availability across the whole Earth. Satellite gravity missions as GOCE can map the Earth gravity field with unprecedented precision and resolution. We mapped geoid changes from two GOCE satellite models obtained by the direct approach, which combines data from other gravity missions as GRACE and LAGEOS regarding their best characteristics. The results show that the geoid height diminished from a year to five months before the main seismic event in the region where maximum slip occurred after the Pisagua Mw = 8.2 great megathrust earthquake. This diminution is interpreted as accelerated inland-directed interseismic mass transfer before the earthquake, coinciding with the intermediate degree of seismic coupling reported in the region. We highlight the advantage of satellite data for modelling surficial deformation related to pre-seismic displacements. This deformation, combined to geodetical and seismological data, could be useful for delimiting and monitoring areas of higher seismic hazard potential.
format	Articulo Articulo
author	Álvarez Pontoriero, Orlando Giménez, Mario Ernesto Folguera Telichevsky, Andrés Guillen, Sofía Tocho, Claudia Noemí
author_facet	Álvarez Pontoriero, Orlando Giménez, Mario Ernesto Folguera Telichevsky, Andrés Guillen, Sofía Tocho, Claudia Noemí
author_sort	Álvarez Pontoriero, Orlando
title	Goce derived geoid changes before the Pisagua 2014 earthquake
title_short	Goce derived geoid changes before the Pisagua 2014 earthquake
title_full	Goce derived geoid changes before the Pisagua 2014 earthquake
title_fullStr	Goce derived geoid changes before the Pisagua 2014 earthquake
title_full_unstemmed	Goce derived geoid changes before the Pisagua 2014 earthquake
title_sort	goce derived geoid changes before the pisagua 2014 earthquake
publishDate	2018
url	http://sedici.unlp.edu.ar/handle/10915/101268 https://ri.conicet.gov.ar/11336/41366
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bdutipo_str	Repositorios
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Goce derived geoid changes before the Pisagua 2014 earthquake

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