IMAGING OF VELOCITY STRUCTURE OF THE UPPER MANTLE FOR THE NORTHERN PORTION OF NORTH-SOUTH SEISMIC BELT(Ⅲ)-APPLICATION AND RESULTS
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    Abstract:

    Based on[1] [2], imaging of seismic velocity structure of crust and upper mantle for the northern portion of N-S Seismic Belt is made. The velocity distribution of upper crust exists three low-velocity belts oriented near EW trend, which agrees with recent active fracturing zones, while in upper mante there are a lot of low velocity belts trend NE and NW, which appear network structures across each other. It is pointed out that the Haiyuan-Guyuan fracturing zone may be a great deep fault, being low velocity belts in upper-, lower-crust and upper mantle. Finally, it is suggested that the northeastern boundary of the Qinghai-Xizhang Block may locate along Tianzhu-Lanzhou-Jingning-Qianyang-Lueyang-Jiangyou, by using inversion.

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History
  • Received:November 20,1988
  • Revised:
  • Adopted:
  • Online: June 30,2017
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