| Autor: |
C. Jacques, A. I. Fernández, C. I. Huerta, O. Romero, R. R. Castro |
| Jazyk: |
English<br />Spanish; Castilian |
| Rok vydání: |
2009 |
| Předmět: |
|
| Zdroj: |
Geofísica Internacional, Vol 48, Iss 3, Pp 297-304 (2009) |
| Druh dokumentu: |
article |
| ISSN: |
0016-7169 |
| Popis: |
We analized body-waves of local and regional earthquakes recorded on the Seismic Network of Northeastern Sonora, Mexico (RESNES) are used to determine empirical attenuation functions for P and S waves in the interval of 0.4-63 Hz. The epicenters are near to the surface rupture of the May 3, 1887 (MW 7.5) Bavispe, Sonora earthquake. Seismograms of vertical and horizontal components at of ground motion hypocentral distances of 25 to 150 km were used in a nonparametric model. The reported attenuation curves indicate that the spectral amplitudes decay faster in the first 40 km of the path and show different decay rate at approximately 80 km. We found that in the upper crust the exponential dependence of Q with frequency is the same for P and S waves, namely Q ~ f 1.1, but QS is larger by a factor of 3. In the lower crust Q is more complex, showdence below 3 Hz and a weaker frequency dependence above 6 Hz. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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