摘要
作为广西24条深大断裂之一,恭城-栗木断裂带的现有研究状况与其重要地位极不相称。以断层岩为主要研究内容,从变形结构、变形环境与古应力场等方面入手探讨了断裂带的活动特征,并分析了其与地震和岩溶塌陷等地质灾害成生之间的联系。研究认为:⑴断裂带属脆性-脆韧性变形域,具有多期次的活动历史,新近构造应力场的主压应力轴有自东西方向向西北方向逆时针旋转的作用轨迹;⑵断裂带的变形结构及活动特征与区域地震的发震及其迁移规律相协调。遵循区域地震发震的折返规律,该断裂可能再次活动并成为控震断裂;⑶断裂带对沿线岩溶作用过程和岩溶塌陷的发育具有时空控制作用,其伴生的岩溶塌陷不仅具有高发概率和高危害性,而且具有可循的规律性。
Gongcheng-Limu fault zone is one of the 24 deep fracture zones in Guangxi. But, it is incommensurate between the low study levels and its important status now. This paper discussed the activity characteristic of the fault zone and analyzed its relationship with seismogenic rule and karst collapses based on the fault rock investigation which can explore the deformation structure and deformation background and paleo-tectonic stress fields of the fault zone. The research indicates that （1） The fault zone is a brittle to brittle - ductile deformation domain and has a multi-episodic activity history. The operation track of the principal compressive stress axis that acts on the fault zone in newly geological history has counterclockwise rotation from EW to NW. （2） The deformation structure of the fault zone and its activity characteristic is in accordance with the seismogenic formation and its transfer rule. It is possible that the fault zone will be active again and will become an earthguake-controlling one （3） The fault zone controls karst processes and karst collapse spatiotemporally. The associated karst collapse not only has high occurrence frequency but also has its regularity
出处
《自然灾害学报》
CSCD
北大核心
2009年第2期160-166,共7页
Journal of Natural Disasters
基金
江苏省土木工程与防灾减灾重点实验室资助项目(批准号:JSCE0702)
国家自然科学基金项目(40473052)
关键词
断裂带
构造分析
多期活动性
地震
岩溶塌陷
fault zone
structural analysis
multi-episodic activity
earthquake
karst collapse
