上海及邻区地震活动特征及地震构造区划  

Seismic activity characteristics and seismotectonic province division of Shanghai and nearby regions

作　　者：谢建磊[1] XIE Jian-Lei(Shanghai Institute of Geological Survey,Shanghai 200072,China)

机构地区：[1]上海市地质调查研究院,上海200072

出　　处：《上海国土资源》2018年第4期1-6,共6页Shanghai Land & Resources

基　　金：中国地质调查局地质调查项目"上海区域地质调查片区总结与服务产品开发"(DD20160345-07)

摘　　要：为进一步理解上海及邻区的地震活动规律和地震地质背景,对地震的空间分布、时间序列和震源深度特征进行了分析,并划分了地震构造区。结果表明,地震在空间上具有很强的丛集性、重复性、分块性和条带性,震源深度多在5-20km,存在5-10km、15-20km两个优势层。在时间上表现出相对平静期和显著活动期的交互特征。弱震震级与震源深度无相关性,其他地震震源深度与震级总体呈一定线性关系。研究认为:空间分布特征与变质基底、盖层结构的差异有关,且分块和条带性主要受北西向和北东向断裂带联合控制;北东向断裂带和复式背斜是主要控震构造,北西和北北西向断裂是重要发震构造;区内未来数年至十余年有发生6级左右地震的可能;部分地震震源深度较浅,会对局部地区产生明显影响。In order to further understand the seismic activity characteristics and geological background, this paper analyzes the characteristics of seismic space distribution, time series, and focal depth, and divides the seismotectonic province accordingly. The results show that earthquakes have strong characteristics of clusters, sub-blocks, and strips. The focal depth mainly concentrates between 5 and 20 km （existing two ascendant depths of 5-10 km and 15-20 km） and also shows interaction characteristics of a relative calm period and a signifcant active period. There is no certain relationship between the magnitude and focal depth. It was concluded that the spatial characteristics are infuenced by metamorphic basement and cap rock, and its sub-block and strip characteristics are jointly controlled by the NW and NE fault belts. NE fault belts and anticlinorium are the main tectonic systems that control earthquakes. The NW and NNW Fault is important for earthquake development because it triggers the tectonic system. It is possible that there will be an earthquake of M 6.0 within the next few years to more than ten years. Some earthquakes of shallow focal depth can infuence the stability of a local area.

关 键 词：地震地质 构造区划 地震活动性 震源深度 

分 类 号：P315.22[天文地球—地震学]