Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/6313
Authors: | Piccinini, D.* Di Bona, M.* Lucente, F. P.* Levin, V.* Park, J.* |
Title: | Seismic attenuation and mantle wedge temperature in the northern Apennine subtuction zone (Italy) from teleseismic body wave spectra. | Journal: | Journal of Geophysical Research | Series/Report no.: | /115 (2010) | Publisher: | AGU | Issue Date: | 14-Sep-2010 | DOI: | 10.1029/2009JB007180 | Keywords: | Northern Apennine Slab RETREAT attenuation mantle |
Subject Classification: | 04. Solid Earth::04.01. Earth Interior::04.01.03. Mantle and Core dynamics 04. Solid Earth::04.01. Earth Interior::04.01.05. Rheology 04. Solid Earth::04.02. Exploration geophysics::04.02.06. Seismic methods 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics |
Abstract: | We analyze P and S wave spectra from moderate‐ to deep‐focus teleseisms recorded at the Retreating‐Trench, Extension, and Accretion Tectonics (RETREAT) temporary broadband seismic network to assess the variations of the Earth mantle attenuation in the northern Apennines region (Italy). For each earthquake, we compute the ratio between the spectrum at each station and the average spectrum, in order to estimate t* residuals (Δt*) from the spectral ratio decay. The number and distribution of the teleseisms useable for the P wave t* calculation allow for a gross azimuthal analysis; although the (Δt*) values at single station display, in most cases, azimuthal‐dependent fluctuations, their overall distribution shows a partition of the study region into two main areas, whose gross features remain almost unchanged over the whole azimuthal range. This partition is confirmed by the S wave t* mean values, computed for each station over the set of useable events. We distinguish a relatively high attenuation area on the western, Tyrrhenian side and a relatively low attenuation area on the eastern, Adriatic side. By correlating our Δt* estimates and the velocity structure derived from the existing tomographic models, we compute the ranges of possible P and S wave Q values in the mantle wedge above the Apennines slab (on the Tyrrhenian side) and in the asthenosphere below the Adriatic region. Furthermore, the determined attenuation properties are used to draw some inferences on the thermal state of the uppermost mantle and on the physical properties of the tectonic elements, which constitute the subduction system in the region. | Description: | An edited version of this paper was published by AGU. Copyright (2010) American Geophysical Union. |
Appears in Collections: | Article published / in press |
Files in This Item:
File | Description | Size | Format | Existing users please Login |
---|---|---|---|---|
2009JB007180.pdf | 1.93 MB | Adobe PDF |
WEB OF SCIENCETM
Citations
20
13
checked on Feb 10, 2021
Page view(s) 5
608
checked on Apr 17, 2024
Download(s)
31
checked on Apr 17, 2024