HR: 11:45h
AN: S52A-05    [Abstracts]
TI: Ambient Noise Surface Wave Tomography Across Europe
AU: * Richmond, R M
EM: Rachelle.Richmond@colorado.edu
AF: Center for Imaging the Earth's Interior, Department of Physics, University of Colorado at Boulder, Campus Box 390, Boulder, CO 80302, United States
AU: Ritzwoller, M H
EM: ritzwoll@merckx.colorado.edu
AF: Center for Imaging the Earth's Interior, Department of Physics, University of Colorado at Boulder, Campus Box 390, Boulder, CO 80302, United States
AU: Villasenor, A
EM: antonio@ija.csic.es
AF: Institute of Earth Sciences "Jaume Almera", Lluis Sole i Sabaris s/n, Barcelona, CO 08028, Spain
AU: Yang, Y
EM: yingjie.yang@colorado.edu
AF: Center for Imaging the Earth's Interior, Department of Physics, University of Colorado at Boulder, Campus Box 390, Boulder, CO 80302, United States
AU: Beck, S L
EM: slbeck@email.arizona.edu
AF: Department of Geosciences, University of Arizona, 1040 E. 4th St., Tucson, AZ 85721, United States
AU: Lerner-Lam, A
EM: lerner@ldeo.columbia.edu
AF: Lamont Doherty Earth Observatory, Columbia University, 61 Route 9W, Palisades, NY 10964, United States
AU: Levin, V
EM: vlevin@rci.rutgers.edu
AF: Department of Geological Sciences, Rutgers University 610 Taylor Road, Piscataway, NJ 08854, United States
AU: Shapiro, N M
EM: nshapiro@ipgp.jussieu.fr
AF: Institut de Physique du Globe de Paris, 4 place Jussieu, Paris, CO 75252, France
AB: We present updated ambient noise tomography (ANT) results from Rayleigh wave group and phase velocities obtained from empirical Green functions produced by cross-correlating long ambient noise sequences between available station pairs across Europe. We use longer time series and introduce stations from temporary networks in an attempt to improve upon the initial ANT results of Europe obtained by Yang et al. (2007) using one year of continuous data from the Virtual European Broadband Seismic Network (VEBSN). In this study, we use 4 years of continuous data (2000, 2001, 2005, 2006) from permanent stations throughout Europe, as well as data from temporary installations and emerging regional networks. Data from 2005-2006 includes three PASSCAL experiments, the North Anatolian Fault (NAF) network in Turkey, the REtreating TRench Extension and Accretion Tectonics (RETREAT) network in Northern Italy, and the Calabria-Apennine-Tyrrhenian/Subduction-Collision- Accretion Network (CAT/SCAN) in Southern Italy, the Spanish National Network, the Israel Broadband Seismic Network, and the Virtual European Broadband Seismograph Network (VEBSN) across Europe. Cross- correlations between stations from the Spanish National Network and the two PASSCAL experiments in Italy improve ray-path coverage in the western Mediterranean. Additionally, cross-correlation pairs between stations from the NAF network in Turkey, the Israel Seismic Network, and permanent stations in Europe improve ray coverage in the eastern Mediterranean region. The earlier time period (2000-2001) is included for improved resolution of the eastern Mediterranean, and utilizes continuous data from two PASSCAL experiments, the Eastern Turkey Seismic Experiment and the Mantle Investigation of the Deep Suture between Eurasia and Africa (Midsea), and other permanent and regional stations throughout Europe. Two-years of stacked cross-correlations are used to obtain Rayleigh wave group and phase velocity dispersion curves, and variation among sets of six- month stacks are used to estimate uncertainty measurements based on seasonal variations. The resulting tomographic images are interpreted in the context of the geophysical characteristics of the crust and upper mantle throughout Europe, and correlate well with known sedimentary basins and regions of thickened crust.
DE: 7205 Continental crust (1219)
DE: 7255 Surface waves and free oscillations
DE: 7270 Tomography (6982, 8180)
SC: Seismology [S]
MN: 2007 Fall Meeting