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1942 Peru earthquake : ウィキペディア英語版 | 1942 Peru earthquake
The 1942 Peru earthquake occurred on August 24 at and was located near the border of the departments of Ica and Arequipa, Peru. It had a magnitude of Mw 8.2, or Ms 8.4.〔http://earthquake.usgs.gov/earthquakes/world/events/1942_08_24.php〕〔"Do trench sediments affect great earthquake occurrence in subduction zones?" by L. J. Ruff〕〔http://www.igp.gob.pe/igp/images/documents/64/publicaciones/otras_publicaciones/monografias/sismicidad_tectonica_peru_Bernal_Tavera.pdf〕 ==Earthquake== This is a megathrust earthquake which ruptured part of the boundary between the Nazca Plate and the South American Plate.〔http://hal.inria.fr/docs/00/65/87/93/PDF/2010JB008166.pdf〕〔http://www2.ess.ucla.edu/~giovanni/new_site/Giovanni_etal_2002.pdf〕 In this area, the Nazca Plate is subducting beneath the South America Plate with a convergence vector of about 7.6 cm/yr. Much of the rupture zone of the 1942 earthquake overlapped with that of the 1996 Nazca earthquake. The rupture zone of the 1942 earthquake was about 40 km longer than that of the 1996 earthquake.〔ftp://white-dome.gps.caltech.edu/pub/avouac/Ge277-2007-fall/Spence_PAG1999.pdf〕 The epicenter of the 1942 earthquake was very close to, but slightly southeast of, that of the 1996 earthquake.〔"Source characteristics of the 12 November 1996 Mw 7.7 Peru subduction zone earthquake" by J. L. Swenson and S. L. Beck〕 The energy released by the 1942 earthquake was about 2.5×1017 Nm.〔
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