沙湾断裂带主要特征及灾害影响

Main features and disaster impacts of Shawan fault zone

沙湾断裂带是珠江三角洲内重要的区域性活动构造,呈北西向展布,贯穿了整个珠江三角洲,多隐伏于城市和水系之下,是广州及其周边城市经济发展的内在隐患.在野外地表调查、物化探勘察、测年分析等工作的基础上,结合前人研究成果,发现沙湾断裂带延伸长、分布广、时代新,具有多期活动的历史,但在目前活动性较弱,主要从改变地应力和地壳稳定性、威胁工程建设的安全、控制震害和次生灾害的形成3个方面对沿带城市产生实际灾害影响.

The Shawan fault zone, important and buried beneath the cities and rivers, crosses the development regional in active tectonics of the Pearl River Delta and whole delta in NW-trending and restricts the economic Guangzhou city and other cities nearby. According to the surface survey, the date of geophysical and geochemical prospecting and previous studies, the zone was found to be extended, widespread, young, hazardous with a history of multi-periodic activities yet weak ones at present, and creates disaster from changing the in-situ stress and crustal stability, controlling the generation of earthquake and secondary disaster, damaging construction.