HR: 1330h
AN: S32B-0850    [PDF]
TI: Investigation of crustal structure throughout Middle East, North Africa and Southern Europe using receiver functions and surface-wave dispersion
AU: * Kosarian, M
EM: mkosarian@geosc.psu.edu
AF: Penn State, Department of Geosciences 503 Deike Building, University Park, PA 16802 United States
AU: Ammon, C J
EM: cammon@geosc.psu.edu
AF: Penn State, Department of Geosciences 503 Deike Building, University Park, PA 16802 United States
AU: Pasyanos, M E
EM: pasyanos1@llnl.gov
AF: Lawrence Livermore National Laboratory, Energy and Environmental Sciences, Livermore, CA 94551 United States
AU: Walter, W R
EM: walter5@llnl.gov
AF: Lawrence Livermore National Laboratory, Energy and Environmental Sciences, Livermore, CA 94551 United States
AU: Herrmann, R B
EM: rbh@eas.slu.edu
AF: Saint Louis University, Department of Earth and Atmos. Sci. 3507 Laclede Avenue, St. Louis, MO 63103 United States
AB: Mapping Earth's structure remains an important, challenging problem. Although, considerable research has been devoted to map lithospheric structure with different data sets, less attention has been given to estimating Earth's structure using multiple data sets. The aim of this research is to estimate lithospheric structure of diverse tectonic environments by applying joint inversion of receiver functions and surface-wave dispersion methods to provide constraints on the character of the lithosphere (crustal velocities and thickness, crust-mantle transition velocity contrast). We included data from 49 more permanent and temporary three-component broadband seismic stations located in the research areas. We computed over 4900 receiver functions for 69 stations for the period of 1990-2003. Many of the sites have been carefully investigated by other researchers using receiver functions that provide good benchmarks for comparing our results. We first applied the thickness-Vp/Vs ratio estimation procedure of Zhu and Kanamori [2000] to estimate crustal thickness and Poisson's ratio. For most stations crustal thickness estimates are consistent with previous geophysical and or seismological work but several stations produce some differences from standard models. For the joint receiver-function surface-wave-dispersion inversions, we use localized group velocities for both Love and Rayleigh waves from tomographic analyses with a 2-degree resolution in the period of 10 to 100 seconds. We present results from the thickness-Vp/Vs stacking procedure and joint inversions for select stations.
UR: http://eqseis.geosc.psu.edu/~cammon/AGUF03B
DE: 7203 Body wave propagation
DE: 7205 Continental crust (1242)
DE: 7218 Lithosphere and upper mantle
DE: 7219 Nuclear explosion seismology
DE: 7255 Surface waves and free oscillations
SC: Seismology [S]
MN: 2003 Fall Meeting