A comparative analysis of the quality factor Q for the regions of Guerrero and Oaxaca, México
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Abstract
Estimates of the quality factor Q. of S waves reported for the regions of Oaxaca and Guerrero, Mexico show that the attenuation in Oaxaca is 3.7 to 5.0 times greater than that in Guerrero for the frequency band from 1 to 30 Hz. This important difference in attenuation of these neighboring regions cannot be completely explained by petrological difference. When the observed values of Q. for Oaxaca and Guerrero are compared with the age of the rocks and the heat flow, it turns out that the attenuation in Oaxaca is greater than expected relative to that in Guerrero. This suggest that the most likely mechanism to explain the observed differences in Q. may be related to the state of stress prevailing when Q. was measured. The high values of Q. estimated for Guerrero can be the result of a Jess fractured crust and tectonic stress accumulated in this region.
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References
ACOSTA-CHANG, J. G., 1980. Estudio de atenuación de ondas sísmicas en el área del terremoto de Oaxaca del 30 de noviembre de 1978. M. S. Thesis, Centro de Investigación Científica y de Educación Superior de Ensenada.
AKI, K., 1980a. Attenuation of shear-waves in the lithosphere for frequencies from 0.05 to 25 Hz. Phys. Earth Planet. Interiors 2I, 50-60. DOI: https://doi.org/10.1016/0031-9201(80)90019-9
AKI, K., 1980b. Scattering and attenuation of shear waves in the lithosphere. J. Geophys. Res. 85, 6496-6504. DOI: https://doi.org/10.1029/JB085iB11p06496
ANDERSON, J. G., S. K., SINGH, J. M. ESPINDOLA and J. YAMAMOTO, 1989. Seismic strain release in the Mexican subduction thrust. Phys. Earth Planet. Interiors 58, 307-322. DOI: https://doi.org/10.1016/0031-9201(89)90102-7
ANDERSON, J. G., 1991. A preliminary descriptive model for the distance dependence of the spectral decay parameter in southern California. Bull. Seism. Soc. Am. 81, 2186-2193.
ARCHAMBEAU, C. B., E. A. FLINN and D. H. LAMBERT, 1969. Fine structure of the upper mantle. J. Geophys. Res. 74, 5825-5865. DOI: https://doi.org/10.1029/JB074i025p05825
BORN, W. T., 1941. Attenuation constant of earth materials. Geophysics 6, 132-148. DOI: https://doi.org/10.1190/1.1443714
CANAS, J. A., L. LL. PUJADES and J. J. EGOZCUE, 1988. Anelastic attenuation Q and attenuation of Lg waves in the region Oaxaca-Chiapas of southern Mexico. Rev. de Geofísica 44, 1229-134.
CASTRO, R. R., J. G. ANDERSON and S. K. SINGH, 1990. Site response, attenuation and source spectra of S waves along the Guerrero, Mexico, subduction zone. Bull. Seism. Soc. Am. 80, 1481-1503.
CASTRO, R. R. and L. MUNGUIA, 1993. Attenuation of P-and S-waves in the Oaxaca, Mexico subduction zone. Phys. Earth Planet. Interiors 76, 179-187. DOI: https://doi.org/10.1016/0031-9201(93)90010-7
CHAVEZ, M., R. GAULON and G. PADILLA, 1993. Coda Q in the Isthmus of Tehuantepec region, Mexico. Seism. Res. Lett. 64, 35.
DELGADO-ARGOTE, L. A. and E. A. CARBALLIDO-SANCHEZ, 1990. Análisis tectónico del sistema transpresivo neogénico entre Macuspana, Tabasco, y Puerto Angel, Oaxaca. Rev. Inst. Geología, UNAM, 9, 21-32.
FLORES, A., 1992. Evolución espacio-temporal de Ia atenuación de ondas sísmicas en Ia costa grande de Guerrero. B. S. Thesis, Universidad Nacional Autónoma de México.
HOUGH, S. E. and J. G. ANDERSON, J. N. BRUNE, F. VERNON III, J. BERGER, J. FLETCHER, L. HAAR, T. HANKS and L. BAKER, 1988. Attenuation near Anza, California. Bull. Seism. Soc. Am. 78, 672-691.
HOUGH, S. E., J. G. ANDERSON, 1988. High-frequency spectra observed at Anza, California: implications for Q structure. Bull. Seism. Soc. Am. 78, 692-707. DOI: https://doi.org/10.1785/BSSA0780020692
HUMPHREY, J. R., and J. G. ANDERSON, 1992. Shear-wave attenuation and site response in Guerrero, Mexico. Bull. Seism. Soc. Am. 82, 1622-1645.
JIN, A., T. CAO and K. AKI, 1985. Regional change of coda Q in the oceanic lithosphere. J. Geophys. Res. 90, 8651-8659. DOI: https://doi.org/10.1029/JB090iB10p08651
KANAMORI, H., P. C. JENNINGS, S. K. SINGH and L. ASTIZ, 1993. Estimation of strong ground motions in Mexico City expected for large earthquakes in the Guerrero seismic gap. Bull. Seism. Soc. Am. 83, 811-829. DOI: https://doi.org/10.1785/BSSA0830030811
JOHNSTON, D. H, M. N. TOKSOZ and A. TIMUR, 1979. Attenuation of seismic waves in dry and saturated rocks: II. Mechanisms. Geophysics, 44, 691-711. DOI: https://doi.org/10.1190/1.1440970
LOCKNER, D., J. B. WALSH and J. BYERLEE, 1977. Changes in seismic velocity and attenuation during deformation of granite. J. Geophys. Res. 82, 5374-5378. DOI: https://doi.org/10.1029/JB082i033p05374
MAHDYIAR, M., 1984. Attenuation properties of the Petatlán region, Mexico, and a local magnitude scale for microearthquakes in this area. Ph. D. Thesis, University of Wisconsin-Madison, Madison, Wisconsin.
MAVKO, G. and A. NUR, 1979. Wave attenuation in partially saturated rocks. Geophysics, 44, 161-178. DOI: https://doi.org/10.1190/1.1440958
MIKAMI, N. and K. HIRAHARA, 1981. Global distribution of long-period P-wave attenuation and its tectonic implications. J. Phys. Earth 29, 97-117. DOI: https://doi.org/10.4294/jpe1952.29.97
MINSTER, J. B. and T. H. JORDAN, 1978. Present day plate motions. J. Geophys. Res. 83, 5331-5354. DOI: https://doi.org/10.1029/JB083iB11p05331
MINSTER, J. B. and T. H. JORDAN, 1979. Rotation vectors for Philippine and Rivera plates (abstract). EOS, Trans. Am. Geophys. Union 60, 958.
NOVELO-CASANOVA, D. A., E. BERG, V. HSU and C. E. HELSLEY, 1985. Time-space variation of seismic S wave coda attenuation (Qc-1) and magnitude distribution (b-values) of the Petatlán earthquake. Geophys. Res. Lett. 12, 789-792. DOI: https://doi.org/10.1029/GL012i011p00789
NOVELO-CASANOVA, D. A., E. BERG and C. E. HELSLEY, 1990. S wave coda Q from 3 to 20Hz and P wave Q for foreshocks and aftershocks of the Petatlán earthquake. J. Geophys. Res. 95, 4787-4795. DOI: https://doi.org/10.1029/JB095iB04p04787
NUR, A. and J. R. BOOKER, 1972. Aftershocks caused by pore fluid flow? Science, 175, 885-887. DOI: https://doi.org/10.1126/science.175.4024.885
ORDAZ, M. and S. K. SINGH, 1992. Source spectra and spectral attenuation of seismic waves from Mexican earthquakes, and evidence of amplification in the hill zone of Mexico City. Bull. Seism. Soc. Am. 82, 24-43.
ORTEGA-GUTIERREZ, F., 1981. Metamorphic belts of southern Mexico and their tectonic significance. Geofísica Internacional, 20, 177-202. DOI: https://doi.org/10.22201/igeof.00167169p.1981.20.3.1085
PROL-LEDESMA, R. M., V. M. SUGROBOV, E. L. FLORES, G. JUAREZ, YA. B. SMIRNOV, A. P. GORSKOV, V. G. BONDARENKO, V. A. RASHIDOV, L. N. NEDOPEKIN and V. A. GAVRILOV, 1989. Heat flow variations along the middle America trench. Mar. Geoph. Res. 11, 69-76. DOI: https://doi.org/10.1007/BF00286248
REBOLLAR, C. J. and R. M. ALVAREZ, 1987. Stress drop estimates for some aftershocks of the Ometepec, Guerrero, Mexico, earthquake of June 7, 1982. Can. J. Earth Sci. 24, 1727-1733. DOI: https://doi.org/10.1139/e87-165
REBOLLAR, C. J., L. MUNGUIA, A. REYES, A. URIBE and O. JIMENEZ, ·1991. Estimates of shallow attenuation and apparent stresses from aftershocks of the Oaxaca earthquake of 1978. Bull. Seism. Soc. Am. 81, 99-108.
RODRIGUEZ, M., J. HAVSKOV and S. K. SINGH, 1983. Q from coda waves near Petatlán, Guerrero, Mexico. Bull. Seism. Soc. Am. 73, 321-326. DOI: https://doi.org/10.1785/BSSA0730010321
RODRIGUEZ-GONZALEZ, M., 1985. Efectos de atenuación, fuente y sitio de las réplicas del temblor de Oaxaca (Ms=7.8), ocurrido el 29 de noviembre de 1978, M. S. Thesis, Centro de Investigación Científica y de Educación Superior de Ensenada.
SINGH, S. K., E. MENA, J. G. ANDERSON, R. QUAAS and J. LERMO, 1990. Source spectra and RMS acceleration of Mexican subduction zone earthquakes. Pageoph 133, 447-474. DOI: https://doi.org/10.1007/BF00878000
SINGH, S. K. and F. MORTERA, 1991. Source time functions of large Mexican subduction earthquakes, morphology of the Benioff zone, age of the plate, and their tectonic implications. J. Geophys. Res. 96, 487-502. DOI: https://doi.org/10.1029/91JB02047
SIPKIN, S. A. and T. H. JORDAN, 1980. Regional variation of Qscs· Bull. Seism. Soc. Am. 70, 1071-1102.
STEWART, R. R., M. N. TOKSOZ and A. TIMUR, 1983. Strain dependent attenuation: Observations and a proposed mechanism. J. Geophys. Res. 88, 546-554. DOI: https://doi.org/10.1029/JB088iB01p00546
SUAREZ, G., T. MONFRET, G. WITTLINGER and C. DAVID, 1990. Geometry of subduction and depth of the seismogenic zone in the Guerrero gap, Mexico. Nature, 345, 336-338. DOI: https://doi.org/10.1038/345336a0
TOKSOZ, M. N., D. H. JOHNSTON and A. TIMUR, 1979. Attenuation of seismic waves in dry and saturated rocks: I. Laboratory measurements. Geophysics, 44, 681-690. DOI: https://doi.org/10.1190/1.1440969
TURCOTTE, D. L. and G. SCHUBERT, 1982. Geodynamics. Applications of continental physics to geological problems. John Wiley and Sons, 450 p.
VALDES, C., 1993. Seismic structure, scaling, seismic attenuation, and gaps, using aftershocks from the major 1979 Petatlán (Ms=7.6) earthquake. Ph.D. Thesis, University of Wisconsin-Madison, Madison, Wisconsin.
VASSILIOU, M., C. A. SALVADO and B. R. TITTMANN, 1982. Seismic attenuation in CRC Hand-book of Physical Properties of Rocks. Vol. III, R.S. Cormichael (Editor), CRC Press, Boca Raton, Florida.
WINKLER, K. W. and A. NUR, 1982. Seismic attenuation: effects of pore fluids and frictional sliding. Geophysics, 47, 1-15. DOI: https://doi.org/10.1190/1.1441276
ZIAGOS, J. P., D. D. BLACKWELL and F. MOOSER, 1985. Heat flow in southern Mexico and the thermal effects of subduction. J. Geophys. Res. 90, 5410-5420. DOI: https://doi.org/10.1029/JB090iB07p05410