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Science 23 July 1971:
Vol. 173. no. 3994, pp. 328 - 330
DOI: 10.1126/science.173.3994.328
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Articles

Microearthquakes in the Ahuachapan Geothermal Field, El Salvador, Central America

Peter L. Ward 1 and Klaus H. Jacob 1

1 Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York 10964

Microearthquakes occur on a steeply dipping plane interpreted here as the fault that allows hot water to circulate to the surface in the geothermal region. These small earthquakes are common in many geothermal areas and may occur because of the physical or chemical effects of fluids and fluid pressure.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)