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The Peru earthquake of October 17, 1966

SEISMOGRAPHIC STATION UNIVERSITY OF CALIFORNIA, BERKELEY, CALIFORNIA
REGIONAL CENTER FOR SEISMOLOGY IN SOUTH AMERICA, LIMA, Peru

Abstract

Seismological results on the destructive Peru earthquake (M = 7.5) include: determination of epicenter, isoseismal map, tsunami observations, and some correlations between intensity and geologic factors. The epicenter was located off the coast of central Peru, about 190 kilometers northwest of Lima. Isoseismals were elongated in the direction of the coast line. The intensity exceeded VIII in the region of Huacho, and reached VII in Lima. There are indications, however, that accelerations and frequencies were both higher than would be expected in the regions for which the Modified Mercalli Scale was developed. Local high intensities were frequently correlated with the occurrence of recent alluvium. Analysis of tsunami travel times shows that the Peru Trench acts as a high-velocity channel which refracts wave energy to the coast in advance of the expected arrival over the direct path.

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