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The geodetic signature of the M8.0 Oct. 9,1995, Jalisco Subduction Earthquake
Author(s) -
Melbourne T.,
Carmichael I.,
DeMets C.,
Hudnut K.,
Sanchez O.,
Stock J.,
Suarez G.,
Webb F.
Publication year - 1997
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 - 10.1029/97gl00370
Subject(s) - subduction , geology , seismology , geodetic datum , episodic tremor and slip , tide gauge , slip (aerodynamics) , fault (geology) , subsidence , thrust fault , geodesy , tectonics , sea level , geomorphology , oceanography , physics , structural basin , thermodynamics
The October, 1995 Mw 8.0 Jalisco subduction earthquake has provided a thorough geodetic observation of the coseismic subduction process. An 11 station regional GPS network located directly onshore of the rupture demonstrates consistent vertical subsidence verified by tide gauge data and southwest‐directed extension, with measured displacements reaching 1 meter. Unusually shallow and non‐uniform faulting is required to explain the displacements. We determine that up to 5 meters of slip occurred within the upper 15 km of the thrust fault zone and 2 meters possibly as shallow as 8 km, and that slip was likely distributed in two main patches. The paucity of continental sediments in this subduction zone could be responsible for the anomalously shallow faulting.