1982 Ometepec earthquake

Earthquake in Mexico 1982 Ometepec earthquake Mexico 1 16.51 N 98.25 W inline,title yes doublet 1982-06-07 06:52:34 1982-06-07 10:59:38 596705 596720 usp0001mrd usp0001mrg 7 June 1982 5.8 b y;EHB 5967056.9 s yAstiz Kanamori 1984. 6.0 b y;EHB 5967207.0 s yAstiz Kanamori 1984. A: 19.4 kmEHB 596705B: 19.9 km;EHB 596720 33.8 kmMexico 1982b Mexico A: VII B: VIII 9 deadEvent: OAXACA, MEXICO https://www.ngdc.noaa.gov/hazel/view/hazards/earthquake/event-more-info/4943 ngdc.noaa.gov The 1982 Ometepec earthquake that struck Mexico's southwestern coast near Ometepec (Guerrero) on 7 June was a doublet earthquake that ruptured in two steps. The first happened at 06:52 UTC, the second five hours later at 10:59 UTC. Estimated magnitudes are 6.9 and 7.0 on the s y scale, and 5.8 and 6.0 on the b y scale.EHB 596705 EHB 596720 Astiz Kanamori 1984. The maximum Mercalli intensities were VII and VIII, respectively.Mexico 1982a ShakeMap usp0001mrd/shakemap Mexico 1982b ShakeMap usp0001mrg/shakemap Mexico's southwestern coast is parallel to the 3,000 km mi on Middle America Trench (MAT), where the oceanic Cocos Plate (a remnant of the ancient Farallon Plate) is being subducted under the North American Plate, resulting in many major earthquakes.Astiz Kanamori 1984 26. Most earthquakes observed in this region are similar to earthquakes seen at other subduction zones, but in the vicinity of Ometepec, they tend to occur as doublets.Yamamoto González-Moran Quintanar Zavaleta 2013 375. This earthquake is unique in being (circa 2013) the "best documented doublet and for which near and teleseismic data are available", and has been extensively studied.Yamamoto González-Moran Quintanar Zavaleta 2013 379. The interruption of the main rupture that results in a doublet earthquake has been attributed to "asperities", patches in the fault where harder rock resists immediate rupture. However, the study of this earthquake's aftershocks shows a discontinuity in their spatial distribution.Yamamoto Quintanar Jiménez 2002 131. This has been interpreted as indicating a split in the subducting plate, where the plate is subducting at slightly different down angles on either side of the split.Yamamoto Quintanar Jiménez 2002 138. Notes 24em Sources 30em cs2 Mexico 1982a usp0001mrd M 6.9 – Oaxaca, Mexico cs2 Mexico 1982b usp0001mrg M 7.0 – Guerrero, Mexico cs2 EHB Luciana Astiz Hiroo Kanamori 1984 An earthquake doublet in Ometepec, Guerrero, Mexico. Physics of the Earth and Planetary Interiors 34 1–2 24–45 10.1016/0031-9201(84)90082-7 http://gps-prod-storage.cloud.caltech.edu.s3.amazonaws.com/people_personal_assets/kanamori/HKpepi84.pdf 1984PEPI...34...24A . Jaime Yamamoto Luis Quintanar Zenón Jiménez 2002 Why earthquake doublets in the Ometepec, Guerrero, Mexico subduction area? Physics of the Earth and Planetary Interiors 132 1–3 131–139 10.1016/S0031-9201(02)00048-1 https://www.researchgate.net/publication/232373408 2002PEPI..132..131Y . Jaime Yamamoto Tomas González-Moran Luis Quintanar Ana B. Zavaleta Araceli Zamora Victor H. Espindola January 2013 Seismic patterns of the Guerrero–Oaxaca, Mexico region, and its relationship to the continental margin structure Geophysical Journal International 192 1 375–389 10.1093/gji/ggs025 2013GeoJI.192..375Y free . See also 596705 Category:1982 earthquakes Category:Earthquakes in Mexico