Seismic Velocity Structure of the Siberian Mantle.

Details Seismic Velocity Structure of the Siberian Mantle. Seismic Velocity Structure of the Siberian Mantle.

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.t33a1331p&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #T33A-1331

Computer Science

Sound

7255 Surface Waves And Free Oscillations, 7260 Theory And Modeling, 8124 Earth'S Interior: Composition And State (Old 8105), 7218 Lithosphere And Upper Mantle

Scientific paper

During the years between 1970 and 1990 an extensive program of deep seismic soundings (DSS) was carried out in northern Eurasia. As part of this program, data were acquired with peaceful nuclear explosions (PNE) as sources along several profiles. Seismic signals were recorded out to very large offsets (more than 3000 km) from the PNEs. In order to constrain the mantle structure, we perform two-dimensional P-wave velocity modeling and inversion of refraction and reflection travel times along three high resolution Russian PNE seismic data profiles (one perpendicular to the other two) from the Eastern Siberian platform: Kimberlite, Kraton and Meteorite. The seismic sections clearly show reflections from the discontinuities at 410, 520 and 660 km depth. Furthermore, a travel time delay is evident around 8 degrees offset in the profiles. It identifies the top of a low-velocity zone below ca. 100 km depth. A similar low-velocity zone has been identified by non-linear inversion of surface wave dispersion curves. Both inversion of group and phase velocities of an epicenter-station path crossing the Siberian Craton and the P-wave velocity structure obtained from the PNE data, suggest the presence of the low-velocity zone in the depth range of 70-150 km with S-wave velocity between 4.35 and 4.45 km/s and a velocity reduction less than 2 % as compared to the surrounding structure. This low-velocity zone is detected in a mantle with very high average seismic velocities, as typical of cratonic regions.
We are presently interpreting the PNE data for possible anisotropy in the low-velocity zone and modeling the physical parameters of seismic scatterers in this layer.

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