INTERPRETATION TO THE OBSERVATIONAL DATA OF NETWORK OF SEISMIC STATIONS IN GANSU, QINGHAI AND NINGXIA FOR A SERIES OF EXPLOSIONS IN YONGDENG COUNTY AND CRUSTAL STRUCTURE OF THE REGION
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    Abstract:

    A series of artificial explosions was made from 1982 to 1983 in Yongdeng County, Gansu Province. This paper deals with the data recorded by the stations in Gansu Province, Qinghai Province and Ningxia Hui Autonomous Region. The velocity of every kind of waves is calculated here: Vpg6.00km/sec, Vsg=3.56km/esc, pn=8.16km/sec, Vsn=4.54kg/sec. The velocity of surface longitudinal wave reaches Vo=4.82km/sec. The reflection wave Pm on Moho discontinuity in 104-180km is 7-10 times greater than Pg wave. The thickness of crust in this region is also gained: 1) Hoxibao-Gaotai, in Gansu, about 48.3km; Gulang-Zhangye-Jiayuguan Pass, 50.2km; the piedmont of Qilianshan Mountain, 53.6km. 2) The middle part and south of Qinghai, 54.4km; 3) Lixian-Wudu, in the east of Gansu, 48.7km. Dingxi-Minxian-Tongwei, 50.5km. 4) Lioupanshan Mountain region, in Ningxia, 51.6km; Jingning, in the west of Lioupanshan Mountain, 48.6 km; Pingliang, in the east of Lioupanshan Mountain, 47.5km; and Baoji, in the southeast of the mountain, 46.1km. It is clear that there is a descend in the edge of northeast of Qinghai-Xizang plateau, by the distribution of crustal thickness mentioned above, but a fluctuation in the eastern area of Gansu Province.

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History
  • Received:May 08,1985
  • Revised:
  • Adopted:
  • Online: July 04,2017
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