Poster of the Coquimbo, Chile Earthquake of 20 June 2003 - Magnitude 6.8

Tectonic Summary

This earthquake occurred in the Chilean subduction zone, in which the dominant tectonic process is the subduction and underthrusting of the Nazca plate to the east beneath the South American plate at a rate of about 8 cm/yr. The currently available location and moment-tensor of the earthquake imply that the shock occurred as a sudden slippage on the thrust-fault boundary between the plates. The hypocenter of this event is located within a segment of the plate boundary that was ruptured in 1943 by a magnitude 7.9 earthquake.


Thumbnail image of poster.


The posters may be downloaded for viewing or for printing on a color plotter. Adobe PDF (.pdf) format files are provided. Adobe Acrobat 6.0 or higher is required for viewing the PDF file on a computer monitor and for printing the PDF map graphic.

Attention MAC users: If you have problems viewing the pdf files, please download the pdf file and view it in the lastest verion of Adobe Acrobat.