منابع مشابه
Shear - Velocity Heterogeneities in the Upper Mantle
Long-period surface waves are used to map lateral heterogeneities of velocity and anisotropy in the upper mantle. The dispersion curves are expanded in spherical harmonics up to degree 6 and inverted to find the depth structure. The data are corrected for the effect of surface layers and both Love and Rayleigh waves are used. Shear wave velocity and shear polarization anisotropy can be resolved...
متن کاملMonte-Carlo inversion for a global shear-velocity model of the crust and upper mantle
S U M M A R Y We describe a method to invert surface wave dispersion data for a model of shear velocities with uncertainties in the crust and uppermost mantle. The inversion is a multistep process, constrained by a priori information, that culminates in a Markov-chain Monte-Carlo sampling of model space to yield an ensemble of acceptable models at each spatial node. The model is radially anisot...
متن کاملConstructing a Geodynamic A Priori Seismic (GAPS) velocity model of upper mantle heterogeneity
[1] Seismic studies of the deep mantle suffer from the fact that the probing seismic waves must traverse the highly heterogeneous and poorly resolved shallow structure. One potential way forward is to develop highresolution models of the crust and upper mantle using other information. Here we describe the construction of a geodynamic a priori model of some aspects of upper mantle seismic veloci...
متن کامل3-dimensional upper mantle velocity structure for iranian plateau revealed by pn and sn tomography
studying crustal and upper mantel structures has been limited in the iranian plateau and there has been little work done in this field. in this paper we have a primary motive to map pn and sn velocities beneath most of the iranian plateau in order to test 3-d mantle models and to develop and test a method to produce pn and sn travel time correction surfaces that are the 3-d analogue of travel t...
متن کاملA global shear velocity model of the upper mantle from fundamental and higher Rayleigh mode measurements
[1] We present DR2012, a global SV-wave tomographic model of the upper mantle. We use an extension of the automated waveform inversion approach of Debayle (1999) which improves our mapping of the transition zone with extraction of fundamental and higher-mode information. The new approach is fully automated and has been successfully used to match approximately 375,000 Rayleigh waveforms. For eac...
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ژورنال
عنوان ژورنال: Geology and Mineral Resources of World Ocean
سال: 2016
ISSN: 1999-7566
DOI: 10.15407/gpimo2016.02.037