1999 Oaxaca earthquake
   | |
| UTC time | 1999-09-30 16:31:15 |
|---|---|
| ISC event | 1656664 |
| USGS-ANSS | ComCat |
| Local date | September 30, 1999 |
| Local time | 11:31 am |
| Magnitude | 7.5 Mw |
| Depth | 61 km |
| Epicenter | 16°03′32″N 96°55′52″W / 16.059°N 96.931°W |
| Total damage | $1.472 billion Mexican pesos |
| Max. intensity | MMI VIII (Severe) |
| Casualties | 35-46 dead, 215 injured |
The 1999 Oaxaca earthquake occurred on September 30 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 7.5.[3]
Earthquake
[edit]The Cocos plate subducts under Oaxaca at approximately 6.4 cm/yr.[4] This was an intraplate earthquake in the Cocos plate, with a normal-faulting mechanism. A similar normal-faulting earthquake was observed in June of the same year. 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.[5][6] The maximum intensity reached MM VIII in southwestern Oaxaca, and could be felt strongly in Mexico City.[7] A total of 21 aftershocks of Mw 4.0-4.7 were reported.[4]
Impact
[edit]The torrential rains and flooding preceding and following the temblor intensified the damage of this earthquake. Thirty-five people were reported dead,[8] although another source states forty-six deaths with 215 injuries.[9] Nearly 1.5 billion pesos of damage was accounted for, and over 45,000 homes were destroyed or damaged.[9] The archeological site of the ancient Zapotec city of Monte Alban also suffered damage in this earthquake.[10]
See also
[edit]References
[edit]- ^ "USGS Earthquake Hazards Program: Earthquake Report: OAXACA, MEXICO". United States Geological Survey. Archived from the original on October 21, 2011. Retrieved October 22, 2011.
- ^ "The Mexico Earthquake, September 30, 1999". Mceer.buffalo.edu. September 30, 1999. Archived from the original on March 31, 2012. Retrieved October 22, 2011.
- ^ "M 7.5 - 15 km W of San Baltazar Loxicha, Mexico". earthquake.usgs.gov. Retrieved April 15, 2025.
- ^ a b Singh, S.K.; et al. (2000). "The Oaxaca Earthquake of 30 September 1999 (Mw = 7.5): A Normal-faulting Event in the Subducted Cocos Plate". Seismological Research Letters. 711 (1): 67–78. Bibcode:2000SeiRL..71...67S. doi:10.1785/gssrl.71.1.67. Retrieved April 15, 2025.
- ^ "Archived copy" (PDF). Archived from the original (PDF) on February 2, 2010. Retrieved August 28, 2010.
{{cite web}}: CS1 maint: archived copy as title (link) - ^ Castro, R. R. (2005), "Stochastic Modeling of the 30 September 1999 Mw 7.5 Earthquake, Oaxaca, Mexico", Bulletin of the Seismological Society of America, 95 (6): 2259–2271, Bibcode:2005BuSSA..95.2259C, doi:10.1785/0120040145
- ^ "CNN Earthquake jolts Mexico City – September 30, 1999". CNN. Archived from the original on October 22, 2012. Retrieved October 22, 2011.
- ^ "Archived copy" (PDF). proteccioncivil.gob.mx. Archived from the original (PDF) on April 14, 2008. Retrieved January 14, 2022.
{{cite web}}: CS1 maint: archived copy as title (link) - ^ a b "Se cumplen 24 años del terremoto que azotó Oaxaca en 1999 | NVI Noticias". nvinoticias.com (in Spanish). April 10, 2025. Retrieved April 15, 2025.
- ^ "Quake Damaged Pre-hispanic Ruins, Archeological Sites". Chicago Tribune. October 3, 1999. Retrieved October 22, 2011.
External links
[edit]- The International Seismological Centre has a bibliography and/or authoritative data for this event.