Interseismic strain accumulation in south central Chile from GPS measurements, 1996-1999

Details Interseismic strain accumulation in south central Chile from GPS measurements, 1996-1999 Interseismic strain accumulation in south central Chile from GPS measurements, 1996-1999

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29k..12r&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 11, pp. 12-1, CiteID 1517, DOI 10.1029/2001GL013438

Physics

6

Geodesy And Gravity: Seismic Deformations (7205), Geodesy And Gravity: Crustal Movements-Intraplate (8110), Seismology: Seismicity And Seismotectonics

Scientific paper

Two campaigns of Global Positioning System (GPS) measurements were carried out in the Concepción-Constitución area of Chile in 1996 and 1999. It is very likely that this area is a mature seismic gap, since no subduction earthquake has occurred there since 1835. In 1996, 32 sites were occupied in the range 35°S-37°S, between the Pacific coast of Chile and the Andes near the Chile-Argentina border. In 1999, the network was extended by the installation of 9 new points in the Arauco region whereas 13 points among the 1996 stations were reoccupied. The analysis of this campaign data set, together with the data recorded at eight continuous GPS sites (mostly IGS stations) in South America and surrounding regions, indicates a velocity of about 40 +/- 10 mm/yr in the direction N80-90°S for the coastal sites with respect to stable cratonic South America. This velocity decreases to about 20-25 mm/yr towards the Andes. We interpret this result as reflecting interseismic strain accumulation above the Nazca-South America subduction zone, due to a locked thrust zone extending down to about 60 km depth.

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