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| Format: | Artículo científico |
| Language: | en |
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Universidad Nacional Autónoma de México
2000
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| Online Access: | https://www.redalyc.org/articulo.oa?id=56839404 |
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Table of Contents:
- Source areas of the Acapulco-San Marcos, Mexico earthquakes of 1962 (M 7.1; 7.0) and 1957 (M 7.7), as constrained by tsunami and uplift records J. Pacheco M. Ortiz S. K. Singh V. Kostoglodov Ciencias de la Tierra tsunami Earthquakes rupture zone South Mexico tide gauge records A reliable location of the rupture areas for the earthquake doublet of 11 May 1962 (M 7.1) and 19 May, 1962 (M 7.0), and theearthquake of 1957 (M 7.8) in the Acapulco-San Marcos region is essential for the assessment of the width and location of thestrongly-coupled patch along the plate interface and for the evaluation of possible rupture scenarios of future earthquakes in theGuerrero seismic gap. We analyze tsunamis recorded by tide gauges at Acapulco and Salina Cruz. A re-examination of the Acapulcorecord shows permanent uplifts of 15±3 cm and 7±3 cm during the 11 May and 19 May 1962 earthquakes, respectively. Nodetectable permanent uplift was found for the 28 July 1957 event. To model the tsunami records we select appropriate focalmechanisms, initial rupture dimensions (L and W), and average dislocations on the fault. By trial and error, we optimize thedimension and location of the rupture area so that the synthetic tsunami fits the residual tsunami waveform. In the case of the 1962events, the predicted uplift is fitted to the observed uplift. The surface projection of the rupture areas of 11 and 19 May 1962earthquakes mostly lies onshore, NW and SE from Acapulco, respectively. The estimated uncertainty in the rupture length and itsoffshore extension is about 5 km. For the 1957 earthquake we model the tsunami at Acapulco as well as at Salina Cruz. The resultssuggest that NW limit of the 1957 rupture area was 30(±5) km SE of Acapulco and L = 90(±20) km. The offshore extension of therupture was less than ~10 km. 2000 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56839404 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.4 Vol.39