李昌珑^1,2,,
吴健^1,2,
高孟潭^1,2
1. 中国地震局地球物理研究所, 北京 100081
2. 中国地震风险与保险实验室, 北京 100081

基金项目: 国家自然科学基金（41704045）和中国地震局地球物理研究所基本科研业务专项（DQJB17T04，DQJB16B19）联合资助


详细信息

作者简介: 李昌珑, 男, 1989年生, 助理研究员, 从事地震构造和地震危险性研究. E-mail:changlongli@163.com

中图分类号: P315;P541

收稿日期:2017-01-16
修回日期:2017-08-27
上线日期:2018-12-05

Study on interaction between major earthquakes around Ordos Block

LI ChangLong^1,2,,
WU Jian^1,2,
GAO MengTan^1,2
1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
2. China Earthquake Risk and Insurance Laboratory, Beijing 100081, China


MSC: P315;P541

--> Received Date: 16 January 2017
Revised Date: 27 August 2017
Available Online: 05 December 2018


摘要
摘要:活动地块作为地质构造单元，其周缘的地震常常较为活跃，并且有时表现出大地震丛集发生的现象.鄂尔多斯地块处于受来自青藏高原NE向的主压应力等多重构造应力作用下的区域构造环境中，地块周缘大地震间相互作用的机制值得研究.本文以鄂尔多斯地块周缘的几次历史地震为例，分别研究了级联断层、地块同侧断层、地块不同侧断层间大地震间应力转移的现象，尝试对地块在其周缘发生大地震时的应力传递和转移行为获得新的认识.得到的结论有：1920年宁夏海原8 1/2级和1927年甘肃古浪8.0级地震分别使六盘山东麓断裂和香山-天景山断裂的大地震期望复发时间提前了800年和20年，六盘山东麓断裂当前的大地震危险性较高.1626年山西灵丘7级地震和1654年甘肃天水南8级地震分别使五台山北麓断裂的大地震复发期望时间提前了50年和279年，鄂尔多斯地块可能将其西南缘受到的部分库仑应力扰动传递到了东缘的五台山北麓断裂.
关键词: 鄂尔多斯地块/
库仑破裂应力/
大地震/
地震发生率

Abstract:As geological structural units, active blocks often have active earthquakes surrounding them, and sometimes show a characteristic of major earthquake clusters.The Ordos Block is in a tectonic environment of multiple tectonic stresses including the NE-trending compressive stress from Tibetan Plateau, the mechanism of the interaction between the major earthquakes around the Ordos Block is worthy of study. In this paper, several historical earthquakes around Ordos Block are taken as examples to study the phenomenon of stress transfer between major earthquakes on cascade faults or faults on one side or different sides of the block, respectively. We tried to obtain new understanding on the block's role in the transfer of stress and transfer behavior around it. The conclusions we got are:the M8 1/2 Ningxia Haiyuan earthquake in 1920 and M8.0 Gansu Gulang earthquake in 1927 led to 800 and 20 years advances of the expected recurrence time on Liupanshan East Fault and Xiangshan-Tianjingshan Fault respectively. The current seismic hazard of Liupanshan East Fault is high. The M7 Shanxi Lingqiu earthquake in 1626 and M8 Gansu Tianshui South earthquake in 1654 led to 50 and 279 years advances of the expected recurrence time on Wutaishanbeilu Fault respectively. Ordos Block may have transferred part of the Coulomb stress disturbance on the southwestern edge to Wutaishanbeilu Fault on the east edge.
Key words:Ordos Block/
Coulomb failure stress/
Major earthquake/
Earthquake occurrence rate



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