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Preliminary report on some aftershocks of the December 28, 1966 earthquake in Northern Chile

ANDREW M. PITT and JAMES O. ELLIS

U.S. GEOLOGICAL SURVEY, MENLO PARK, CALIFORNIA

Abstract

Epicenters of aftershocks of the December 28, 1966 earthquake in northern Chile lie in a 75-km north-trending zone 20 to 30 km off the coastline. The epicenter for the main shock, as determined by the U.S. Coast and Geodetic Survey, is about 10 km north of the southern end of the aftershock zone. The aftershocks are about 30 km deep in the model used for locations; this places them in the lower crust or upper mantle. The aftershocks have no apparent relation to any surface faults.

Footnotes

Publication authorized by the Director, U.S. Geological Survey

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