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Attenuation of Coda Waves at the Tres Vírgenes Volcanic Area, Baja California Sur, México

Centro de Investigación Científica y de Educación Superior de Ensenada
Department of Seismology, Earth Sciences Division
Km-107 Carretera Tijuana-Ensenada
Ensenada 22860, Baja California, México
vwong{at}cicese.mx
Imunguia{at}cicese.mx
rebollar{at}cicese.mx

Manuscript received 27 February 2000.

We estimated the coda-wave attenuation quality factor Q_c at the Tres Vírgenes volcanic area from 26 local seismic events recorded by a portable network of seven digital stations. The quality factor Q_c was estimated using the single-scattering attenuation model of Sato (1977), in the frequency range from 6 to 24 Hz. The magnitudes of the analyzed events range from 1 to 3. These events occurred at hypocentral depths ranging from 3 to 6 km and were recorded at epicentral distances of up to 30 km. Within the variation of Q_c, six out of seven stations analyzed showed quite similar values at all frequencies. Data from these six stations led to an average Q_c given by Q_c(f) = (50 ± 3) f^(0.65±0.20) in the indicated frequency range. For the seventh station, which is located near a steam production well, anomalous low Q_c values were obtained. For this particular site we found Q_c(f) = (4.3 ± 0.6)f^(1.33±0.05). In this zone, we observed an abnormally strong reduction of Q_c, leading to attenuation values that are three to four times larger than for the whole area of study. Results from other geophysical studies suggest the presence of a highly conductive body below this particular area. A correlation of the observed coda attenuation with a geothermal anomaly is suggested.

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