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《Chinese Journal of Geophysics》 1981-03
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THE VERTICLE VELOCITY STRUCTURE IN THE MANTLE OF BEIJING-SAHALIN PROFILE

SONG ZHONG-HE ZHU JIE-SHOU AN CHANG-QIANG ZHANG LI-JUAN  
In this paper, the authors study the velocity distribution with depth in the mantle of Beijing-Sahalin Profile, which is based on the records of more than 300 earthquakes in the area from Beijing to Western Aleutian Is., selected from 26 stations consisting of Beijing Network, Dalian, Changchun, Mudan Jiang, Vladivoctok, etc.According to Herglotz-Wiechert's formula, the authors calculate the V-h relation and use it as an initial model to compute the theoretical time-distance curves, and find out the velocity structure which agrees well with the results obtained from the practical time-distance curve. The velocity at the top of the mantle is about 7.8 km/sec. In the covering layer with high velocity, there is a positive velocity gradient, and the low velocity layer appears at the depth about 60-120 km. The velocity increases slowly below 130 Km. There are two transitional layers with greater velocity gradient at the depths of 370-440 km and 600-740 km, the former one having the greater velocity gradient, and its corresponding epicentral distance is 19°. Below 1000 km, the velocity increases a little more rapidly.By the method of Kaila, the results from the calculation of the velocity in the sources of deep earthquakes, whose sources are in the depth about 400 km, agree with the results above.
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