STUDY ON THE CRUSTAL THICKNESS BENEATH STATIONS OF SEISMIC NETWORK IN ANHUI PROVINCE BY TELESEISMIC RECEIVER FUNCTION

doi:10.3969/j.issn.0253-4967.2013.04.014

Abstract

Abstract: In this paper,we calculate receiver functions of body wave under the 18 stations in Anhui Province from 3-component digital waveform data of teleseismic earthquake events and obtain the thickness and V_P/V_S ratio in the crust of this area through H-Kappa stacking. Our result is consistent with previous studies. Combining the tectonics data and our result,we consider that Anhui area can be divided into three areas according to the crustal thickness. The first one is the Dabie Shan area in the southwest of Anhui Province,the crustal thickness is about 35 to 38km; the second one is the southeast of Anhui Province,the crustal thickness is about 34km; and the last one is middle and northeast of Anhui,the crustal thickness is about 31 to 32km. The V_P/V_S ratio in Anhui area does not vary obviously spatially,but there are three stations LAN,SCH and JSA,under which the crustal velocity ratio is obviously higher,up to 1.79,1.80 and 1.80,respectively. In fact,the station LAN and SCH are located at the border between the North China block and the Yangtze block,and the JSA station is on the Tan-Lu Fault zone and beside the Sulu UHP metamorphic belt. Therefore,we infer that the high crustal velocity ratio under LAN,SCH and JSA stations are probably attributable to the deep large faults beneath the stations.

Key words: receiver function, crustal thickness, H-Kappa stacking

摘要： 据安徽台网18个台站的远震波形资料，用频率域反褶积方法提取接收函数，由H-Kappa叠加方法反演得到各台站下方的地壳厚度及平均波速比。研究结果显示，安徽地区地壳厚度在空间分布上存在明显的区域特征。主要表现为：秦岭大别造山带地壳厚度较厚，如佛子岭台下方地壳厚度达38km；皖南地区地壳厚度在34km左右；皖北平原地区地壳厚度基本都在30～32km，变化较小。分析认为，安徽地区地壳厚度分布和波速比分布与安徽省地质构造背景有很好的关联性。在波速比方面，除嘉山台、宿城台和六安台之外的其他15个台站下方波速比变化不大，为1.70～1.75。而处在秦岭大别造山带和华北平原地块交界处的六安台和宿城台以及位于苏鲁超高压变质带西侧的郯庐带上的嘉山台，具有较高的波速比，分别为1.79、1.80和1.82。高波速比可能与台站下方深大断裂有关。

关键词: 接收函数, H-Kappa叠加, 地壳厚度

CLC Number:

P315.61

HONG De-quan, WANG Xing-zhou, LI Jun-hui, NI Si-dao. STUDY ON THE CRUSTAL THICKNESS BENEATH STATIONS OF SEISMIC NETWORK IN ANHUI PROVINCE BY TELESEISMIC RECEIVER FUNCTION[J]. SEISMOLOGY AND GEOLOGY, 2013, 35(4): 853-863.

洪德全, 王行舟, 李军辉, 倪四道. 利用远震接收函数研究安徽地区地壳厚度[J]. 地震地质, 2013, 35(4): 853-863.

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