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|Title:||S wave attenuation in the coastal region of Jalisco-Colima, Mexico|
|Abstract:||Aftershock data from the October 9, 1995, M = 7.6 earthquake, that occurred in the coastal subduction region of Colima-Jalisco, Mexico, are used to obtain estimates of the frequency independent quality factor Q(s) and spectral decay parameter ?, in the approximate frequency range 3 Hz ? f ? 40 Hz, as functions of hypocentral distance r. A regression analysis results in the relations for S waves: Q(s) = 261.397 + 3.198r � 15.536 ? = 0.009651 + 0.000462r � 0.0012. The observed distance dependence of Q(s) and ? is similar to that reported for the Mexican regions of Oaxaca and Guerrero. Our Q(s) values agree with those reported for Oaxaca and northern Baja CA for frequencies around 8 Hz, and are somewhat lower (a factor of ~0.8 to ~0.5) for higher frequencies around 20 Hz; however, they are siginificantly lower than all but the lowest values reported for the Guerrero region, attaining factors ~ 0.25 and ~ 0.13 for frequency ranges around 8 and 20 Hz, respectively. It thus appears that the Guerrero region has an anomalously low attenuation compared with the flanking coastal regions of Oaxaca-Chiapas to the SE and Jalisco-Colima to the NW.|
|Appears in Collections:||Producción científica UdeG|
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