Depth dependent seismic scattering attenuation in the Nuevo Cuyo region (southern central Andes)

Details Depth dependent seismic scattering attenuation in the Nuevo Cuyo region (southern central Andes) Depth dependent seismic scattering attenuation in the Nuevo Cuyo region (southern central Andes)

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3624307b&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 24, CiteID L24307

Physics

Geophysics

2

Physical Properties Of Rocks: Wave Attenuation, Mathematical Geophysics: Wave Propagation (0689, 2487, 4275, 4455, 6934), Seismology: Subduction Zones (1207, 1219, 1240)

Scientific paper

In the present work we separated intrinsic from scattering attenuation coefficients both for the crust and the upper mantle in the tectonically highly active areas of the Southern-Central Andes - Nuevo Cuyo region, analyzing two groups of earthquakes, well separated in depth. This region is characterized by the presence of flat subduction. We apply MLTWA (Multiple Lapse Time Window Analysis), coda normalization and Q-coda techniques to measure the scattering and intrinsic attenuation coefficient and the total Q for S waves. We find that intrinsic attenuation does not decrease with depth whereas scattering attenuation is higher in the crust than in the upper mantle, and that intrinsic attenuation predominates over scattering attenuation. We interpret this observation in terms of the release of water and other fluids into the overlying lithosphere due to the dynamics of the subduction process, in agreement with most of the prevalent geodynamic models.

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