Physics
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30osde9k&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 15, pp. SDE 9-1, CiteID 1807, DOI 10.1029/2003GL017219
Physics
47
Geodesy And Gravity: Crustal Movements-Interplate (8155), Geodesy And Gravity: Seismic Deformations (7205), Seismology: Seismicity And Seismotectonics, Tectonophysics: Plate Boundary-General (3040), Tectonophysics: Stresses-General
Scientific paper
Geodetic measurements from a network of permanent GPS stations along the Pacific coast of Mexico reveal a large ``silent earthquake'' along the segment of the Cocos-North American plate interface identified as the Guerrero seismic gap. The event began in October of 2001 and lasted for 6-7 months. Average slip of ~10 cm produced measurable displacements over an area of ~550 × 250 km2. The equivalent moment magnitude of the event was Mw ~ 7.5. Recognition of this and previous slow event here indicate that the seismogenic portion of the plate interface is not loading steadily, as hitherto believed, but is rather partitioning the stress buildup with episodic, as opposed to steady-state or periodic, slip downdip of the seismogenic zone. This process increases the stress at the base of the seismogenic zone, bringing it closer to failure. These results call for a reassessment of the seismic potential of Guerrero and other seismic gaps in Mexico.
Bilham Roger
Franco Sara Ivonne
Kostoglodov Vladimir
Larson Kristine M.
Lowry Anthony R.
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