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1981 Playa Azul earthquake
The 1981 Playa Azul earthquake occurred on October 25, 1981 at 03:22 UTC (on October 24, 1981 at 21:22 local time). It was located near Playa Azul, Michoacán, Mexico. The magnitude of the earthquake was Mw 7.2, or Ms 7.3. Three deaths were reported, two from Michoacán and one from Mexico City. Some buildings were damaged in both Michoacán and Mexico City. A small tsunami was registered in Acapulco with a maximum height of 9 cm.
==Tectonic setting==
The southwestern coast of Mexico lies above the convergent boundary where the Rivera Plate and Cocos Plate are being subducted beneath the North American Plate along the Middle America Trench. The area is seismically very active with large thrust type earthquakes occurring along the plate interface and normal fault type earthquakes occurring at a somewhat deeper level within the descending slab. The plate interface seismicity in this area is strongly segmented, with separate Jalisco, Michoacán, Guerrero and Colima segments being recognised. The southeastern end of the Michoacan segment coincides with the broad Orozco fracture zone within the Cocos Plate. During the 1970s, with no major earthquakes recorded since at least 1911, the segment was recognised as a major seismic gap.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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