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Seismic attenuation in southern Mexico using the coda Q method

CIVIL ENGINEERING SCHOOL POLITECHNIC UNIVERSITY OF CATALUNYA, BARCELONA, Spain

Abstract

The coda Q method has been applied to a set of earthquakes recorded by the short-period vertical component of the seismograph station OXM in southern Mexico. A frequency independent Q₀ value of 489 for the L_g phase has been found for southern Mexico. This value is similar to the values found for central Rocky Mountains, and higher than those obtained for the Western United States.

Assuming that P_g, P_n, S_g, and S_n phases behave as wave trains, attenuation coefficients have been found for periods close to 1 sec. The attenuation coefficient values for the P_g, S_n, and S_g phases are almost equal to that of the L_g phase. The P_n wave shows a slightly higher value than the corresponding L_g wave. This could be due to scattered P_n data. This study indicates that the 1 Hz L_g attenuation in southern Mexico is about three times lower than in California.