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1911 Guerrero earthquake : ウィキペディア英語版 | 1911 Guerrero earthquake
The 1911 Guerrero earthquake occurred on December 16 at near the coast of Guerrero, Mexico along the Mexican subduction zone. The earthquake's energy was calculated using several different magnitude scales with an estimated moment magnitude of 7.6 and a surface wave magnitude of 7.8. Following the event, telegraphy reports came in from a broad area of Mexico. Cities from Guadalajara, Mérida (on the Yucatán Peninsula), and Tapachula (near Guatemala) all reported the tremors. The duration of the shaking was just over two minutes and the death toll was placed at 28. ==Tectonic setting== In the region, the Cocos, North American, and Caribbean Plates converge and create a tectonic zone of consistent and long term seismicity. Guerrero is located where the Cocos plate is being subducted under the North American plate, and the rupture area of the earthquake may have occurred in the Guerrero seismic gap, which is a stretch along the Middle America Trench that had not experienced movement nearly as often as nearby segments of the subduction zone. The convergence rate of the Cocos and North American plates in the Guerrero seismic gap varies between annually. This level of precision was made possible after the installation of permanent GPS monitoring stations, the first of which was installed in 1997 at Cayaco, Guerrero. The gap was defined as having a northwest section and a southeast section. The most recent significant events in the southeast sector were the 1907 and 1957 Guerrero earthquakes with respective magnitudes of 7.9 and 7.8. The 2007 report stated that the northwestern zone has not experienced a significant release of energy since the December 1911 event.〔
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