CRUST SEISMIC SCATTERING STRENGTH BENEATH THE MIDDLE‐SOUTH SEGMENT OF THE TANCHENG‐LUJIANG FAULT ZONE

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS 地球物理学报 Pub Date : 2017-05-01 DOI:10.1002/CJG2.30042
Fan Xiao-ping, He Yi-cheng, Wang Jun-fei, Yang Yun
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引用次数: 2

Abstract

Broadband teleseismic waveform data from 10 earthquakes recorded by 134 digital seismic stations were selected to study the seismic scattering strength of the crust in the middle-south segment of the Tancheng-Lujiang fault zone by teleseismic fluctuation wave field method. The results show that strong transverse inhomogeneity exists beneath the middle-south segment of the Tancheng-Lujiang fault zone, and that the spatial distributions of seismic scattering strength exhibit conformity between the upper and lower crusts. Strong seismic scattering strength is found beneath the north China block and the Qinling-Dabie fold system, whereas weak seismic scattering strength is found under the Yangtze block. The peak value of seismic scattering strength is mainly distributed in Lu'an, Junan, Jiashan, and Yantai, among others. The tectonic blocks are correlated with seismic scattering strength. Different blocks show different seismic scattering strengths. Seismic scattering strength, which can be divided into three segments, shows a segmental feature along the Tancheng-Lujiang fault zone. The first segment is from Weifang to Linyi, the second is from Linyi to Jiashan, and the third is from Jianshan to Jiujiang. Earthquake activity is strongly correlated with seismic scattering strength, and the epicenters of moderate earthquakes are located along the gradient zone of seismic scattering strength. Many smaller earthquakes occur along the high gradients of seismic scattering strength throughout the Tancheng-Lujiang fault zone, such as the segment of Linyi to Jiashan, and the segment of Jianshan to Jiujiang. However, the segment of Linyi to Jiashan with fewer earthquakes shows a low gradient of seismic scattering strength. Seismic scattering strength shows coherency with tectonic blocks, deep fault structure, and earthquake activity. Thus, seismic scattering strength reflects the different physical properties of a medium in the crust and is also related to the physical morphology of the medium, substance migration, and variations in stress-strain environment in the deep structure.
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郯城—庐江断裂带中南段地壳地震散射强度
选取134个数字地震台站记录的10次地震的宽带远震波形资料,采用远震波动波场法研究了郯城—庐江断裂带中南段地壳的地震散射强度。结果表明,郯庐断裂带中南段存在较强的横向不均匀性,地震散射强度的空间分布表现为上下地壳间的整合性。华北地块和秦岭-大别褶皱体系的地震散射强度较强,扬子地块的地震散射强度较弱。地震散射强度峰值主要分布在六安、君安、嘉山、烟台等地。构造块体与地震散射强度相关。不同块体表现出不同的地震散射强度。地震散射强度沿郯城—庐江断裂带呈现分段特征,可划分为3个分段。第一段是从潍坊到临沂,第二段是从临沂到嘉山,第三段是从尖山到九江。地震活动性与地震散射强度密切相关,中等地震的震中位于地震散射强度梯度带。在整个郯城—庐江断裂带,沿地震散射强度的高梯度发生了许多小地震,如临沂—嘉山段和尖山—九江段。而临沂至嘉山段地震较少,地震散射强度梯度较小。地震散射强度与构造块体、深部断裂结构和地震活动具有一致性。因此,地震散射强度反映了地壳中介质的不同物理性质,也与介质的物理形态、物质迁移以及深部结构应力-应变环境的变化有关。
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来源期刊
地球物理学报
地球物理学报 地学-地球化学与地球物理
CiteScore
3.40
自引率
28.60%
发文量
9449
审稿时长
7.5 months
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