Journal
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
Volume 173, Issue 1-2, Pages 33-50Publisher
ELSEVIER
DOI: 10.1016/j.pepi.2008.10.013
Keywords
Seismic tomography; Upper mantle; Hainan plume; Plume deflection
Categories
Funding
- Natural Science Foundation of China [40774044]
- Active-fault Investigation in the 10th Five-year National Plan [0106512]
- Japanese Ministry of Education and Science [17204037]
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We present a high-resolution tomographic image in the upper mantle for the Hainan plume determined by using both local and teleseismic data. The arrival-time data from teleseismic events are measured precisely from seismograms recorded by nine permanent seismic stations in Hainan island and Leizhou peninsula. Our results show that striking low-velocity (low-V) anomalies of up to -5% in the crust and -2% in the mantle are visible under the Hainan hotspot from the surface down to 250 km depth. The Hainan plume is imaged as a continuous, NW-SE tilting, low-V column with a diameter of about 80 km. Given the denser data coverage and finer parameterization, our result represents a significant improvement with respect to earlier, regional and global tomographic studies. Such an inclination of the Hainan plume can be explained by numerical simulations. The tilted plume conduit in the upper mantle could be associated with the subduction of oceanic plates, especially the Philippine Sea plate, and the extrusion of the Eurasian plate. Most likely, the tilted plume conduit has buoyantly risen from the lower mantle. (c) 2008 Elsevier B.V. All rights reserved.
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