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《Chinese Journal of Geophysics》 1993-04
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THE 2-D STRUCTURE AND IT'S TECTONIC IMPLICATIONS OF THE CRUST IN THE LIJIANG-PAN- ZHIHUA-ZHEHAI REGION

XIONG SHAO-BAI ZHENG YE YIN ZHOU-XUN ZENG XIAO-XIAN QUAN YOU-LI SUN KE-ZHONG(Institute of Geophysics, Academia Sinica, Beijing 100101)  
A reconfirmation of the seismic phases and computations of 2-D ray tracing and synthetic seismograms are completed in this paper for the explosion seismological data along profile WE in the Panzhihua-Xichang region Seven seismic phases Pg,P1,P2,P3,P4, Pm and Pn have been confirmed, the P1 and P3 are neglected in 1-D explanation in the past.The result shows that: There are four low- and several high-velocity zones near the surface and they are well related to the geology and tectonics. A high-velocity body near Panzhihua extends downwards from surface to the bottom of upper crust and forms a shape out horst structure which are seemly deeper tectonic background from whole structure of the crust. This high-velocity body is related to the Panzhihua mineralization and it is thought that to the west from Huaping is also a favorable zone for looking for mineral deposit. There is a low-velocity zone about 9km thick and it is possible a tenacity shear zone in the crust. The top of this zone is located at 27.0-29.5km deep which is in keeping with the lower depth of earthquake focusi and to the Curie deep in the region. There is another small low-velocity zone at the upper part of the middle crust, and it is reflecting tectonized inhomogeneity in different parts of the tectonic belt-The crust is 53.0-56.0 km thick and the Moho is not obvious uplift in the middle part of the tectonic belt.
【Fund】: 国家自然科学基金
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