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
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Abstract
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 the earthquake of 1957 (M 7.8) in the Acapulco-San Marcos region is essential for the assessment of the width and location of the strongly-coupled patch along the plate interface and for the evaluation of possible rupture scenarios of future earthquakes in the Guerrero seismic gap. We analyze tsunamis recorded by tide gauges at Acapulco and Salina Cruz. A re-examination of the Acapulco record shows permanent uplifts of 15±3 cm and 7±3 cm during the 11 May and 19 May 1962 earthquakes, respectively. No detectable permanent uplift was found for the 28 July 1957 event. To model the tsunami records we select appropriate focal mechanisms, initial rupture dimensions (L and W), and average dislocations on the fault. By trial and error, we optimize the dimension and location of the rupture area so that the synthetic tsunami fits the residual tsunami waveform. In the case of the 1962 events, the predicted uplift is fitted to the observed uplift. The surface projection of the rupture areas of 11 and 19 May 1962 earthquakes mostly lies onshore, NW and SE from Acapulco, respectively. The estimated uncertainty in the rupture length and its offshore extension is about 5 km. For the 1957 earthquake we model the tsunami at Acapulco as well as at Salina Cruz. The results suggest that NW limit of the 1957 rupture area was 30(±5) km SE of Acapulco and L = 90(±20) km. The offshore extension of the rupture was less than ~10 km.
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References
ANDERSON. J. G., J. N. BRUNE, J. PRINCE, R. QUAAS, S. K. SINGH, D. ALMORA, P. BODIN, M. OÑATE, R. VASQUEZ and J. M. VELASCO, 1994. The Guerrero accelerograph network. Geofísica Internacional, 33, 341-371. DOI: https://doi.org/10.22201/igeof.00167169p.1994.33.3.1177
ANDERSON. J. G., S. K. SINGH, J. M. ESPINDOLA and J. YAMAMOTO, 1989. Seismic strain release in the Mexican subduction thrust. Phys. Earth Plan. Interiors., 58, 307-322. DOI: https://doi.org/10.1016/0031-9201(89)90102-7
CROSS, R. H., 1968. Tide Gage Frequency Response. Journal of the Waterways and Harbors Division. Proceedings of the American Society of Civil Engineers., 317-330. DOI: https://doi.org/10.1061/JWHEAU.0000575
CRUZ, G. and M. WYSS, 1983. Large earthquakes, mean sea level, and tsunamis along the Pacific coast of Mexico and Central America. Bull. Seism. Soc. Am., 73, 553-570. DOI: https://doi.org/10.1785/BSSA0730020553
DEMETS, C., R. GORDON, D. ARGUS and S. STEIN, 1994. Effect of recent revisions to the geomagnetic reversal time scale on estimates of current plate motions. Geophys. Res. Lett.,. 21, 2191-2194. DOI: https://doi.org/10.1029/94GL02118
GODIN, G., R. DE LA PAZ, N. RODRIGUEZ and M. ORTIZ, 1980. La marea y el nivel del mar a lo largo de la costa occidental de México. Geofísica Internacional, 19, 239-258. DOI: https://doi.org/10.22201/igeof.00167169p.1980.19.3.887
GONZALEZ-RUIZ, J. R. and K. C. McNally, 1988. Stress accumulation and release since 1882 in Ometepec, Guerrero, Mexico: Implications for failure mechanism and risk assessments of a seismic gap. J. Geophys. Res.,93, 6297-6317. DOI: https://doi.org/10.1029/JB093iB06p06297
GOTO, C., Y. OGAWA, N. SHUTO and F. IMAMURA 1997.IUGG/IOC TIME Project: Numerical Method of Tsunami Simulation with the Leap-Frog Scheme, Intergovernmental Oceanographic Commission of UNESCO, Manuals and Guides # 35, Paris, 4 Parts.
GRIVEL, F., 1967. Anomalies of the mean sea level at Acapulco, Gro., Mexico. Geofísica Internacional, 7, 53-61. DOI: https://doi.org/10.22201/igeof.00167169p.1967.7.2.1130
KOSTOGLODOV, V. and L. PONCE, 1994. Relationship between subduction and seismicity in the Mexican part of the Middle America trench. J. Geophys. Res., 99, 729-742. DOI: https://doi.org/10.1029/93JB01556
KOSTOGLODOV V., W. BANDY, J. DOMINGUEZ and M. MENA, 1996. Gravity and seismicity over the Guerrero seismic gap, Mexico. Geophys. Res. Lett., 23, 3385-3388. DOI: https://doi.org/10.1029/96GL03159
KOSTOGLODOV, V., R. VALENZUELA, A. GORBATOV,J. MIMIAGA, S. I. FRANCO, J. A. ALVARADO and R. PELAEZ, 2000. Deformation in the Guerrero seismic gap, Mexico, from leveling observations, accepted for J. Geodesy. DOI: https://doi.org/10.1007/s001900000144
LIU, P., Y. CHO and S. SEO, 1995. Numerical Simulations of the 1960 Chilean Tsunami Propagation and Inundation at Hilo, Hawaii. Tsunami Progress in Prediction, Disaster Prevention and Warning. Y. Tsuchiya and N. Shuto (editors). Kluwer Academic Publishers. DOI: https://doi.org/10.1007/978-94-015-8565-1_7
MANSINHA, L. and E. SMYLIE, 1971. The Displacement Field of Inclined Faults. Bull. Seimol. Soc. Am., 61, 1433-1440. DOI: https://doi.org/10.1785/BSSA0610051433
MERINO y CORONADO, J., 1957. El Temblor del 28 de Julio de 1957. Anal. Inst. Geofísica, UNAM., 3, 89-125.
MERINO y CORONADO, J., E. SALYANO, J. J. ROSALES and M. MARTINEZ, 1962. Los temblores de Acapulco de 1962. Anal. Inst. Geofísica, UNAM., 8, 23-36.
NISHENKO S. P. and S. K. SINGH, 1987a. Conditional probabilities for the recurrence of large and great interplate earthquakes along the Mexican subduction zone. Bull. Seism. Soc. Am., 77, 2096-2114.
NISHENKO S. P. and S. K. SINGH, 1987b. The Acapulco-Ometepec, Mexico, earthquakes of 1907-1982: Evidence for a variable recurrence history. Bull. Seism. Soc. Am.,77, 1359-1367.
ORTIZ, M., S. K. SINGH, J. PACHECO and V. KOSTOGLODOV, 1998. Rupture length of the October 9, 1995 Colima-Jalisco earthquake (Mw 8) estimated from tsunami data. Geophys. Res. Lett.,25, 2857-2860. DOI: https://doi.org/10.1029/98GL02059
PEDLOSKY, J., 1979. Geophysical Fluid Dynamics, 624 pp. Springer-Verlag. DOI: https://doi.org/10.1007/978-1-4684-0071-7
SAVAGE, J. C., 1983. A dislocation model of strain accumulation and release at a subduction zone. J. Geophys. Res., 88, 147-157. DOI: https://doi.org/10.1029/JB088iB06p04984
SINGH, S. K., E. BAZAN and L. ESTEVA, 1980. Expected earthquake magnitude from a fault. Bull. Seism. Soc. Am.,70, 903-914. DOI: https://doi.org/10.1785/BSSA0700030903
SINGH, S. K., J. M. ESPINDOLA, J. YAMAMOTO and J. HAVSKOV, 1982. Seismic potential of Acapulco-San Marcos region along the Mexican subduction zone. Geophys. Res. Lett.,9, 633-636. DOI: https://doi.org/10.1029/GL009i006p00633
SINGH, S. K., T. DOMINGUEZ, R. CASTRO and M. RODRIGUEZ, 1984. P waveform of large, shallow earthquakes along the Mexican subduction zone. Bull. Seism. Soc. Am., 74, 2135-2156. DOI: https://doi.org/10.1785/BSSA0740062135
SINGH, S. K. and F. MORTERA, 1991. Source-time functions of large Mexican subduction earthquakes, morphology of the Benioff zone and the extent of the Guerrero gap. J. Geophys. Res., 96, 21487-21502. DOI: https://doi.org/10.1029/91JB02047
S. M., 1993-1997. Navigational Charts: SM600, scale 1:707,300, Jul, 1993; SM500, scale 1:750,000. Feb.,1994; SM529, scale 1:10,000, Ene, 1996; SM628, scale1:12,500, Nov, 1997. Secretaría de Marina de México.
UTSU, T. and A. SEKI, 1954. A relation between the area of aftershock region and the energy of main shock (in Japanese). J. Seism. Soc. Jap., 7, 233-240. DOI: https://doi.org/10.4294/zisin1948.7.4_233
WYRTKI, K., 1990. Sea level rise: The facts and the future. Pacific Sci., 44, 1-16.
WYSS, M., 1979. Estimating maximum expectable magnitude of earthquakes from fault dimensions. Geology 7, 336-340. DOI: https://doi.org/10.1130/0091-7613(1979)7<336:EMEMOE>2.0.CO;2