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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS011 Oral Presentation 2118 Iranian Model Determination for Crust and Upper Mantle using Pn and Sn Tomography Dr. Shadi Tabatabai Institute of Geophysics University of Tehran IASPEI Eric Bergman, M.R. Gheitanchi This paper has a primary motive to map Pn and Sn velocities beneath most part of Iranian Plate inorder to test 3D mantel models and to develop and test a method to produce Pn and Sn travel time correction surfaces that are the 3D analogue of travel time curves for a 1D model. To the EHB data we apply the tomographic method of Barmin et al.(2001), augmented to include station and event corrections and an epicentral distance correction. The Pn and Sn maps are estimated on a 2o * 2o grid through out Iranian Plate. We define the phases Pn and Sn as arriving between epicentral distances of 3o and 15o. After selection, the resulting data set consists of about 42,000 Pn and 10,800 Sn travel times distributed inhomogeneously across Iranian Plate. The Pn and Sn maps compare favorably with recent 3D models of P and S in the uppermost mantle. The rms misfit to the entire Iranian data set from the Pn and Sn model increases linearly with distance and averages about 1.5 s for Pn and 3.1 s for Sn. Further research remains to determine if these results improve regional location capabilities. Keywords: iran, upper mantle, tomography
IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS011 Oral Presentation 2119 Crust and upper mantle structure in the Caribbean Region by group velocity tomography and regionalization Dr. Mariangela Guidarelli Department of Earth Sciences University of Trieste O'Leary Gonzales, Leonardo Alvarez, Giuliano Francesco Panza An overview of the crust and upper mantle structure of the Central America and Caribbean region is presented as a result of the processing of more than 200 seismograms recorded by digital broadband stations from SSSN and GSN seismic networks. Group velocity dispersion curves are obtained in the period range from 10 s to 40 s by FTAN analysis of the fundamental mode of the Rayleigh waves; the error of these measurements varies from 0.06 and 0.09 km/s. From the dispersion curves, seven tomographic maps at different periods and with average spatial resolution of 500 km are obtained. Using the logical combinatorial classification techniques, eight main groups of dispersion curves are determined from the tomographic maps and eleven main regions, each one characterized by one kind of dispersion curves, are identified. The average dispersion curves obtained for each region are extended to 150 s by adding data from a larger scale tomographic study (Vdovin et al., 1999) and inverted using a non-linear procedure. A set of models of the S-wave velocity vs. depth in the crust and upper mantle is found as result of the inversion process. In six regions we identify a typically oceanic crust and upper mantle structure, while in other two the models are consistent with the presence of a continental structure. Two regions, located over the major geological zones of the accretionary crust of the Caribbean region, are characterized by a peculiar crust and upper mantle structure, indicating the presence of lithospheric roots reaching, at least, about 200 km of depth. Keywords: tomography, caribbean, regionalization
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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy<br />
(S) - <strong>IASPEI</strong> - International Association of Seismology and Physics of the Earth's<br />
Interior<br />
JSS011 Oral Presentation 2118<br />
Iranian Model Determination for Crust and Upper Mantle using Pn and Sn<br />
Tomography<br />
Dr. Shadi Tabatabai<br />
Institute of Geophysics University of Tehran <strong>IASPEI</strong><br />
Eric Bergman, M.R. Gheitanchi<br />
This paper has a primary motive to map Pn and Sn velocities beneath most part of Iranian Plate inorder<br />
to test 3D mantel models and to develop and test a method to produce Pn and Sn travel time correction<br />
surfaces that are the 3D analogue of travel time curves for a 1D model. To the EHB data we apply the<br />
tomographic method of Barmin et al.(2001), augmented to include station and event corrections and an<br />
epicentral distance correction. The Pn and Sn maps are estimated on a 2o * 2o grid through out Iranian<br />
Plate. We define the phases Pn and Sn as arriving between epicentral distances of 3o and 15o. After<br />
selection, the resulting data set consists of about 42,000 Pn and 10,800 Sn travel times distributed<br />
inhomogeneously across Iranian Plate. The Pn and Sn maps compare favorably with recent 3D models<br />
of P and S in the uppermost mantle. The rms misfit to the entire Iranian data set from the Pn and Sn<br />
model increases linearly with distance and averages about 1.5 s for Pn and 3.1 s for Sn. Further<br />
research remains to determine if these results improve regional location capabilities.<br />
Keywords: iran, upper mantle, tomography
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