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《Seismological Research of Northeast China》 1990-01
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POSSIBLE APPLICATION OF SEISMIC TOMOGRAPHY IN DETERMINATION OF 3-D VELOCITY STRUCTURE IN VALCANO REGION

Chen Peishan Institute of Geophysics, SSB  
The principle and method of seismic tomography has been introduced in this paper, and its application, as an example. to Yun-nan province has been made. Images of the velocity cross- section at 10 different depths have been successfully reconstructed, using the lechniques of seismic tomography developed by Liu Futian. These velocity cross-sections are consistent with the results of six velocity profiles of deep seismic sounding. The image of the velocity in the upper crust above 20km depth is very similar to the well-known geological structure and ali the strong earthquakes nearly occurred in the transition zones between high and low velocity regions. There are low velocity layers in most regions of eastern and northern Yun-nan province in the mediate crust beneath 20km. V=5.6--6.0km/s. but no low velocity layers in the south-western part V=6.3--6.4 km/s. The velocity in the top upper mantle is nearly 7.6--7.8km in northern Yun-nan, but 8.05km/s in the south. There are significant low velocity layers in the upper mantle of 200km depth in most regions studied. There is still obvious lateral inhomogeity at 450km depth. The Teng-chong area is an entirely low velocity region from crust to the upper mantle, perhaps some thermal matter rises from the upper mantle to the surface. The reconstruction method of ST used in this paper has two advantages: 1) The velocity model is determined by specifying node-velocities of hexahedron and linear interpolation through known basic function. A velocity field with lateral continuous velocity. value and vertical discontinuities is established. This model is obviously better than the block model of constant velocity. The ver- tical discontinuities allow the model to simulate velocity discontinuities in the crust and upper mantle. 2) The velocity and hypocenter parameters are separated by introducing an orthogonal pro- jeetion operator. Sequential orthogonal triangulariza tion and modified singular decomposition are adopted. These measures reduce the RAM requirement by one order of magnitude and reduce the amount of conputation to a half. The technique of seismic tomography can also be used to determine 3-D velocity and Q- value structure in valcano region. But high quality or seismic network is necessary.
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