Physics
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pepi..115..247n&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 115, Issue 3-4, p. 247-257.
Physics
3
Scientific paper
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 Qs and spectral decay parameter κ, 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:Qs=261.397+3.198r+/-15.536/κ=0.009651+0.000462r+/- 0.0012.The observed distance dependence of Qs and κ is similar to that reported for the Mexican regions of Oaxaca and Guerrero. Our Qs 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 significantly 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.
Castro Rafael
García-Arthur R.
Márquez B.
Nava Alejandro F.
Núnñez-Cornú F.
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