孕震构造块体与相应地震区划分方法  

Partition method of seismogenic tectonic block and its corresponding seismic zone

作　　者：吴晓娲 秦四清[2,3,4] 薛雷 张珂[2,3,4] 陈竑然[2,3] 翟梦阳[2,3,4] WU Xiaowa;QIN Siqing;XUE Lei;ZHANG Ke;CHEN Hongran;ZHAI Mengyang(BGI Engineering Consultants LTD,Beijing,100038;Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029;Innovation Academy for Earth Science,Chinese Academy of Sciences,Beijing,100029;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing,100049)

机构地区：[1]北京市勘察设计研究院有限公司,北京100038 [2]中国科学院地质与地球物理研究所中国科学院页岩气与地质工程重点实验室,北京100029 [3]中国科学院地球科学研究院,北京100029 [4]中国科学院大学地球与行星科学学院,北京100049

出　　处：《地质论评》2021年第2期325-339,共15页Geological Review

基　　金：第二次青藏高原综合科学考察研究资助项目(编号:2019QZKK0904);国家重点研发计划资助项目(编号:2019YFC1509701)的成果。

摘　　要：可靠地划分地震区可奠定地震预测与地震危险性评价的地质基础,具有十分重要的意义。笔者等通过研究分析指出板内孕震构造块体侧向边界可由区域性大断层或由区域性大断层与板块边界界定,底边界为康拉德面或低速高导层;板间孕震构造块体为俯冲板块,可由区域性大断层和(或)板块边界约束;在同一个孕震构造块体和同一轮地震周期的地震具有内在联系。因此,地震区可定义为代表相应孕震构造块体地震活动的区域,其可表征该块体内源自锁固段破裂的地震活动。基于笔者等提出的孕震构造块体和相应地震区边界确定原则,把全球两大地震带(环太平洋地震带和欧亚地震带)划分为62个地震区;每个地震区的分区方案均通过了多锁固段脆性破裂理论的检验,这说明方案可靠。进而,笔者等归纳总结了地震区划分方法。The reliable partition of seismic zones is very important for earthquake prediction and seismic hazard evaluation.We have recognized that an intraplate seismogenic tectonic block is laterally bounded by major faults,or by major faults and plate boundaries,and its bottom boundary is the Conrad discontinuity or the lowvelocity and high-conductivity layer;an interplate seismogenic tectonic block,a subducting plate,is constrained by major faults and/or plate boundaries;the earthquakes within the same seismogenic tectonic block and the same seismic period are intrinsically linked.Thus,a seismic zone can be defined as an area representing the seismicity generated from the locked segment’s cracking within the corresponding seismogenic tectonic block.Based on the principle of determining the boundaries of a seismogenic tectonic block and its corresponding seismic zone we propose,the two major seismic belts worldwide,the Circum-Pacific seismic belt and the Eurasia seismic belt,are divided into 62 seismic zones;the partition scheme of each seismic zone has passed the test of the brittle failure theory of multiple locked segments,which shows that the scheme is reliable.Furthermore,we summarize the seismic zoning method.

关 键 词：孕震构造块体 地震区划分 区域性大断层 板块边界 锁固段 

分 类 号：P31[天文地球—固体地球物理学]