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1931 Oaxaca earthquake
The 1931 Oaxaca earthquake affected portions of southern Mexico on January 15, at 01:50 UTC. It registered a magnitude of 8.0 on the surface wave magnitude scale and had a maximum perceived intensity of X (''Extreme'') on the Mercalli intensity scale.〔
==Tectonic setting==
The state of Oaxaca lies above the convergent boundary where the Cocos Plate is being subducted below the North American Plate at a rate of 6.4 cm/yr. The dip of the subducting slab is about 15° as defined by focal mechanisms and earthquake hypocenters. Seismicity in this area is characterised by regular megathrust earthquakes along the plate interface. In addition, there have been a series of historical normal fault events within the subducting slab. The area affected by moderate seismic intensities is about four times greater for the normal fault events compared to those on the plate interface and the peak horizontal acceleration is also higher in most cases.
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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