Precursory transient slip during the 2001 Mw = 8.4 Peru earthquake sequence from continuous GPS

Details Precursory transient slip during the 2001 Mw = 8.4 Peru earthquake sequence from continuous GPS Precursory transient slip during the 2001 Mw = 8.4 Peru earthquake sequence from continuous GPS

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29u..28m&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 21, pp. 28-1, CiteID 2032, DOI 10.1029/2002GL015533

Physics

9

Geodesy And Gravity: Crustal Movements-Interplate (8155), Seismology: Earthquake Dynamics And Mechanics, Seismology: Seismicity And Seismotectonics, Tectonophysics: Dynamics, Seismotectonics

Scientific paper

Two-hour position estimates from a continuous GPS station located at Arequipa, Peru, document precursory deformation beginning 18 hours prior to an Mw = 7.6 aftershock of the June 23rd 2001 Mw = 8.4 earthquake. This preseismic signal appears on the north and east components as a slow displacement with an amplitude twice that of the subsequent coseismic. Analysis of three years of 18-hour rate measurement shows this signal to be unprecedented and beyond four standard deviations from the mean rate. The best fitting centroid is directionally consistent with slow slip along the plate interface and suggests the preseismic deformation arises from creep near the aftershock rupture. This implies the Nazca-South American plate interface slipped slowly prior to seismogenic faulting. These observations indicate the Mw = 7.6 earthquake grew out of slow slip along the plate interface and clearly demonstrate the breadth of slip rates accommodated by subduction zone plate interfaces.

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