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《Chinese Journal of Geophysics》 1995-01
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SEISMIC TOMOGRAPHY BENEATH THE QINLINGDABIE OROGENIC BELTS AND BOTH THE NORTHERN AND SOUTHERN FRINGES

LIU JIAN-HUA;LIU FU-TIAN;SUN RUO-MEI;WU HUA;WU DAN (Institute of Geophysics,Chinese Academy of Sciences,Beijing 100101)  
In this paper 3-D velocity images of the crust and upper mantle beneath the Qinling-Dabie Oregenic belts and both the northern and southern fringes are reconstructed using 23600 P-wave arrivals of regional earthquakes recorded at 310 stations in the study area.The image results are summarized as follows:1.The velocity images given in this paper indicate a significant lateral heterogeneity in the crust and upper mantle beneath the Qinling-Dabie Orogenic belts and adjacent regions,which persists down to a depth of 110km.2.The velocity images of the upper crust are closely related to surface geological features:the velocities of upfold zones in the orogenic belts are high,and of basin.and depression zones are low.The southern boundary of the Qinling-Dabie Orogenic belts have been drawn by the velocity contrast on both sides of them.3.The image of the mid-crust shows some of low-velocity areas within the orogenic belts,corresponding to some large-scale nappe structures.4.The velocity image at a depth of 40+0km shows clearly fluctuation of Mohointerface.5.The low-velocity abnormity appears in the Northern Qinling tectonic belt located at Luanchuan,Shangxian,Danfeng,and it is probably due to thermal processes in the depths of the upper mantle.
【Fund】: 国家自然科学基金
【CateGory Index】: P542.2
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