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Surface-wave magnitudes of Eurasian earthquakes and explosions

DEPARTMENT OF EARTH AND ATMOSPHERIC SCIENCES SAINT LOUIS UNIVERSITY, ST. LOUIS, MISSOURI 63103

Abstract

Body-wave magnitudes, m_b, and surface-wave magnitudes, M_S, were determined for approximately 100 Eurasian events which occurred during the interval August through December 1971. Body-wave magnitudes were determined from 1-sec P waves recorded by WWSSN short-period, vertical-component seismographs at epicentral distances greater than 25°. Surface-wave magnitudes were determined from 20-sec Rayleigh waves recorded by long-period, vertical-component WWSSN and VLPE seismographs. The earthquakes had m_b values ranging from 3.6 to 5.7.

Of 96 presumed earthquakes studied, 6 lie in or near the explosion portion of an m_b:M_S plot. The explosion m_b:M_S curve was obtained from seven Eurasian events which had m_b values ranging from 5.0 to 6.2 and M_S values from 3.2 to 5.1. All six anomalous earthquakes were located in the interior of Asia, in Tibet, and in Szechwan and Sinkiang provinces of China. In general, oceanmargin earthquakes were found to have more earthquake-like m_b:M_S values than those occurring in the continental interior. Neither focal depth nor focal mechanism can explain the anomalous events.

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