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The 2006 aseismic slow slip event in Guerrero, Mexico: New results from GPS
Author(s) -
Larson Kristine M.,
Kostoglodov Vladimir,
Miyazaki Shin'ichi,
Santiago Jose Antonio Santiago
Publication year - 2007
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 - 10.1029/2007gl029912
Subject(s) - geology , subduction , seismology , slip (aerodynamics) , trench , episodic tremor and slip , global positioning system , intraplate earthquake , geodesy , tectonics , telecommunications , chemistry , physics , organic chemistry , layer (electronics) , computer science , thermodynamics
Crustal deformation measurements from Guerrero, Mexico were made with continuous GPS instrumentation. This network spans 75 km along the coast and a 275 km transect from the coast to Mexico City, which is perpendicular to the Middle America trench. A large aseismic slip transient occurred from April to December 2006, yielding horizontal displacements of nearly 6 cm in the direction opposite to that recorded interseismically. This transient slip episode closely follows a series of ∼M5 deep intraplate events that occurred in the northwestern portion of the Guerrero region. Both horizontal and vertical displacements are inverted for the Guerrero GPS network to determine slip along the subduction interface. Using a simple fault model that accommodates changes in the subduction zone geometry, it is found that slip is concentrated on interior fault patches, and propagated to the southeast. This slip event has a minimum equivalent Mw of 7.5.