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《Northwestern Seismological Journal》 1981-03
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TRAVEL TIME OF P-WAVE AND UPPER MANTLE STRUCTURE IN THE QINGHAI-XIZANG PLATEAU REGION

Jia Su-juan Cao Xue-feng Yan jia-quan (Institute of Geophysics, State Seismological Bureau)  
Using the data of natural earthquakes, we have studied the characteristics of P-wave travel time in Qinghai-Xizang plateau and its vicinity. From2°to 26°, travel time of p-wave could be approximately de scribed by three sections of straight line, there are remarkable changes for apparent velocities near 10°and 19°Inferred upper mantle structure shows:(1)The P-wave velocity in the uppermost part of the mantle beneath the plateau is 8.11±0.04 km/sec;(2)In the Tengchong(腾冲)district, there exists a low-velocity layer with a p-wave velocity of 7.59±0.09km/sec The depth of the lowvelocity Iaye is between 40km and 170km;(3)The depth of "20°discontin.aity" is 450-500km, and theP wave velocity beneath it is about 9.9km/sec;(4)P-wave velocities increase, with depth from Moho towards "200 discontinuity".Besides, we have discussed the tectouophysical implications of the results, in this paper.
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