摘要
以郯庐断裂带苏鲁交汇区及邻区近50年的地方震资料为数据样本,在定量分析交汇区最小完备震级和系统推导极大似然法原理的基础上,重点研究区域G-R关系尤其是b值时空分布演化特征,依据b值指示意义进行区域内5级以上地震关联性和构造应力分布状况分析.研究得到:b值时间分布特征表明中强震发生时段与中短期b值下降时段吻合明显;b值空间分布特征表明区域内郯庐断裂带西侧东经117°~118°、北纬33.5°~35.5°范围地壳应力较高,结合相关地质资料认为此范围处于孕震阶段,本文可对郯庐断裂带苏鲁交汇区潜在震源区和地震危险性的评估、推断提供一定的科学启示.
The data of local earthquakes in Jiangsu-Shandong intersection area and its adjacent area of TanLu fault zone in recent 50 years are taken as the data samples. Based on the quantitative analysis of the minimum complete magnitude in the intersection area and the systematic derivation of the principle of the maximum likelihood method, this paper focuses on the study of the G-R relationship in the area, especially the evolution characteristics of the temporal and spatial distribution of the b-value. According to the indication of the b-value, the correlation between the b-value and the earthquakes with M_L≥5 in the area and the distribution of the crustal tectonic stress indicated by theb-valueare analyzed. Research results reveal:The time distribution characteristics of b-valueindicate that the occurrence time of moderate strong earthquake coincides with that of the decrease time of medium and short-term value obviously. The spatial distribution of b-value indicates that the crustal stress in the west of TanLu fault zone is high between 117°~118°E and 33.5°~35.5°N. Combined with the relevant geological data, it is inferred that the region is in the stage of earthquake preparation.This paper can provide some scientific enlightenment for the evaluation and inference of the potential focal area and the seismic risk of the Jiangsu-Shandong intersection area of the TanLu fault zone.
作者
余腾
朱益民
王鑫
胡伍生
朱红
YU Teng;ZHU Yi-min;WANG Xin;HU Wu-sheng;ZHU Hong(School of Civil Engineering and Architecture,Suqian College,Suqian 223800,China;Institute of Crustal Dynamics,China Earthquake Administration,Beijing 100085,China;Department of Surveying Engineering,Southeast University,Nanjing 210096,China;Suqian Earthquake Service Center,Suqian 223800,China)
出处
《地球物理学进展》
CSCD
北大核心
2020年第6期2134-2142,共9页
Progress in Geophysics
基金
国家自然科学基金(41574022)
江苏省高校自然科学研究面上项目(20KJB170009)
宿迁市科技计划项目(K201914)联合资助。
关键词
郯庐断裂带
苏鲁交汇区
G-R关系
B值
时空分布
TanLu fault zone
Jiangsu-Shandong intersection area
G-R relationship
b-value
Temporal and spatial distribution
