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《North China Earthguake Sciences》 2001-01
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Q-VALUE STRUCTURE OF THE UPPER CRUST IN CHANGBAISHAN Mt.VOLCANIC REGION

Deng Hongzhao Zhang Xiankang (Research Center of Exploration Geophysics,China Seismological Bureau,Zhengzhou 450002)  
Compared with earthquake data,artificial earthquake profiling data have a lot of advantages,such as that source is spherically symmetrical and their position is known;observational points are very dense;sources and observing points are in a straight line;and the velocity structure of the studied area can be determined exactly.In this paper,a new model to inverse the Q-values in layered medium with artificial earthquake data has been proposed.Based on the function of Q-value in depth,combining the results of each explosion points we can study the lateral variation of Q-value along the profile. Using the method above mentioned the Q-value structure of the upper crust along profile L1 in Changbaishan Mt.Region was calculated.It is found that the Q-value under the Tianci Volcano region is much smaller than that in adjacent regions.This low Q-value region locates just above the low velocity anomalous body in Tianci Region,which corresponds to the magma eruption channel in the past.
【Fund】： 中国地震局“九五”重点研究项目!( 95-1 1 -0 2 -0 1 -0 1 )
【CateGory Index】： P315.3
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