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Earthquake damage in Imperial Valley, California May 18, 1940, as reported by T. A. Clark

DEPARTMENT OF GEOLOGICAL SCIENCES AND MARINE SCIENCE INSTITUTE UNIVERSITY OF CALIFORNIA, SANTA BARBARA, CALIFORNIA 93106

Abstract

Bureau of Reclamation civil engineer T. A. Clark surveyed and photographed damage to water distribution systems on both sides of the International Boundary immediately following the Imperial Valley, California, earthquake of May 18, 1940. His report, written only weeks after the earthquake, focuses on damage to enginneered structures such as aqueducts, canals, flumes, roads and bridges caused by horizontal surface rupturing, shaking, lurching, and, to a lesser degree, liquefaction. Clark's report and photographic illustrations are a valuable supplement to the relatively sparse amount of structural engineering data previously available for such an important seismic event in California's earthquake history.