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郯庐断裂带南段及邻区地震b值的空间分布特征
吴萍萍 贾建鹏
防灾科技学院 河北三河 065201
摘要:
郯庐断裂带是中国东部地区上的一条主干断裂带,切穿了中国东部不同大地构造单元,控制着东部地区的构造活动。本文收集中国地震台网中心1970~2010年的地震目录,将研究区划分成1°×1°网格,分别求出每个网格的b值,最后得出研究区b值的空间分布特征。研究结果发现:郯庐断裂带及周围b值表现为低值,由于郯庐断裂附近的小震活动性比较弱,因此低b值可能反映了研究区内大震周期长的特征;断裂带两侧苏鲁和大别造山带b值分布特征与高压超高压变质带分布趋势相似;华北中央造山带地区b值表现为高值,地震大多沿着断裂分布,地震频度高。通过结合已有地质和地球物理研究,发现b值的分布特征与岩性或介质物性参数分布有一定的对应关系,说明研究区内的b值分布(即地震活动特征)与该地区地壳介质不均匀性密切相关。
关键词:  郯庐断裂带  b值  地震活动  地震频度
DOI:
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基金项目:
Spatial Distribution Characteristic of the b-value in Dabie-Sulu and Its Adjacent Areas
Wu Pingping and Jia Jianpeng
Institute of Disaster Prevention,Sanhe 065201,Hebei,China
Abstract:
The Tanlu (Tancheng-Lujiang) fault is one of the major structures in eastern China,which cuts across different blocks and controls the tectonic activity. Using the seismic data from the China Earthquake Networks Center,we investigate the spatial variations of the b-value in the Dabie-Sulu (Jiangsu-Shandong) organic belt by calculating the b-value of each grid (1°×1°) from 1970 to 2010. The study shows that: the b-value is smaller in the Tanlu fault and its adjacent area,which might suggest that the major earthquake recurrence period is relatively long due to the lower frequency of small earthquake activity. In both sides of Tanlu fault,the b-value is higher at the edge of Sulu block and the eastern part of Dabie orogenic belt. The b values are higher in North China central orogenic belt,and small earthquake activity which occurred along the central orogenic belt is frequent. Additionally, combined with geological and geophysical study,we find that the b-value has a certain correspondence relationship with the lithologic distribution,which informs us that seismic activity features are closely related to the inhomogeneous media in the crust.
Key words:  Tanlu(Tancheng-Lujiang) fault b-value  Earthquake activity  Earthquake frequency