1999 Oaxaca earthquake

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1999 Oaxaca earthquake
1999 Oaxaca earthquake is located in Mexico
1999 Oaxaca earthquake
Date September 30, 1999
Origin time 16:31 UTC
Magnitude Mw 7.4
Depth 61 km
Epicenter 16°03′32″N 96°55′52″W / 16.059°N 96.931°W / 16.059; -96.931Coordinates: 16°03′32″N 96°55′52″W / 16.059°N 96.931°W / 16.059; -96.931
Max. intensity MM VIII
Casualties 35

The 1999 Oaxaca earthquake occurred on September 30, 1999 at 11:31 local time (16:31 UTC) in Oaxaca, Mexico, 60 km NNW of Puerto Ángel.[1] The epicenter was located near San Agustin Loxicha.[2] It had a magnitude of Mw 7.4.[3] The maximum intensity reached MM VIII in southwestern Oaxaca, and could be felt strongly in Mexico City.[4] The torrential rains preceding and following the temblor intensified the damage of this earthquake. 35 people were reported dead.[5] The archeological site of the ancient Zapotec city of Monte Alban also suffered damage in this earthquake.[6] This was an intraplate earthquake in the Cocos Plate, with a normal-faulting mechanism. The fault plane was 90 km long and 45 km wide. The maximum slip was about 2.5 m, which was located about 20 and 40 km WNW of the hypocenter.[7][8] A research of M. A. Dunajecka and S. A. Pulinets showed that anomalies in temperature and humidity had been observed before the earthquake.[9]

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