Upper mantle P wave velocity structure of the northern part of China and Mongolia |
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| Authors: | Jian-Ping Wu Rong-Sheng Zeng and Yue-Hong Ming |
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| Institution: | (1) Institute of Geophysics, China Seismological Bureau, 100081 Beijing, China |
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| Abstract: | The average upper mantle P wave velocity structure and lateral heterogeneity in the northern part of China and Mongolia are
investigated by waveform inversion of broadband body waveform data recorded by CDSN and digital stations around China. The
average model has a low P wave velocity lid (about 7.8–8.0 km·s−1) with thickness about 60 km, and two discontinuities with velocity jumps of 0.29 km·s−1 and 0.55 km·s−1 at depth of 410 km and 665 km respectively. In the Jungger basin, the P wave velocity of uppermost mantle is about 7.7 km·s−1. The lid thickness (90–100 km) and velocity gradient (average gradient is greater than 0.005 5/s) are large. At the depth
of 140 km the P wave velocity reaches to 8.2 km·s−1. Near in Baikal, the lid is about 30 km thick with average P wave velocity of 8.00–8.05 km·s−1.
Contribution No. 98A01012, Institute of Geophysics, China Seismological Bureau, China.
This subject is sponsored by the State Natural Science Foundation of China and by the Chinese Joint Seismological Science
Foundation (9507413). |
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| Keywords: | upper mantle P wave velocity structure waveform inversion the northern part of China Mongolia |
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