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The months of March and April were quite active seismically speaking. There was one major earthquake (7.0<M<8.0), a magnitude 7.1 shock on April 25 in northern California. Earthquake-related deaths were reported in Iran, Costa Rica, Turkey, and Germany.
The months of May and June were very active in terms of earthquake occurrence. Six major earthquakes (7.0<M<8.0) occurred during this reporting period. These earthquakes included a magnitude 7.1 in Papua New Guinea on May 15, a magnitude 7.1 followed by a magnitude 7.5 in the Philippine Islands on May 17, a magnitude 7.0 in the Cuba region on May 25, and a magnitude 7.3 in the Santa Cruz Islands of the Pacific on May 27. In the United States, a magnitude 7.6 earthquake struck in southern California on June 28 followed by a magnitude 6.7 quake about three hours later.
Primary responsibility for the preparation of <i>Earthquakes & Volcanoes</i> within the Geological Survey has shifted from the Office of Scientific Publications to the Office of Earthquakes, Volcanoes, and Engineering (OEVE). As a consequence of this reorganization, Henry Spall has stepepd down as Science Editor for <i>Earthquakes & Volcanoes(E&V)</i>.
Recognition of the volcanic unrest at Mount Pinatubo in the Philippines began when steam explosions occurred on April 2, 1991. The unrest culminated ten weeks later in the world's largest eruption in more than half a century.
This issue of <i>Earthquakes & Volcanoes</i> focuses on a series of three powerful earthquakes centered near Cape Mendocino, California, on April 25-26, 1992. The sequence began with a magnitude 7.1 mainshock at 11:06 a.m. (local time) on April 25. Strong aftershocks with magnitudes of 6.6 and 6.7 occurred on April 26 at 00:41 a.m. and at 4:18 a.m., respectively.
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Studies suggest that magmatic gas seepage had turned Lake Nyos in Cameroon into a time bomb; evidence mounts against a volcanic trigger for last August's disaster.
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