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Two successive slow slip events evidenced in 2009–2010 by a dense GPS network in Guerrero, Mexico
Author(s) -
Walpersdorf Andrea,
Cotte Nathalie,
Kostoglodov Vladimir,
Vergnolle Mathilde,
Radiguet Mathilde,
Santiago José Antonio,
Campillo Michel
Publication year - 2011
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2011gl048124
Subject(s) - slip (aerodynamics) , episodic tremor and slip , global positioning system , subduction , seismology , geology , aperiodic graph , geodesy , computer science , physics , tectonics , telecommunications , thermodynamics , mathematics , combinatorics
A large slow slip event (SSE) had been expected for the Guerrero gap for 2010. It was actually observed with an onset in July 2009. Comparison with the preceding large SSEs, which occurred in 2002 and 2006, highlights both persistent characteristics of the Guerrero SSEs (e.g. the localization of slip in the seismogenic part of the subduction interface), and also particularities of the 2009/2010 event (namely two distinct slip patches on the fault interface moving consecutively). The long GPS time series and the density of the GPS network provide evidence that the Guerrero SSEs, like classical earthquakes, have complex features. Despite having very short and relatively regular repeat times (∼4 yr), Guerrero SSEs appear aperiodic. A shorter loading time before the 2009/2010 event than before the 2006 SSE seems to produce consistently reduced surface displacements for a group of stations in a core zone.