从新构造观点试论深圳市的地壳稳定性

The Evaluation on the Crustal Stability of Shenzhen from the View-point of Neotectonics

处于莲花山断裂带西南段的深圳活动断裂带,新构造时期,尤其是全新世以来,断块的差异升降幅度和速率,水热活动,断裂及地震活动性所反映出的地壳活动强度均处于较低水平,不具备产生大震的构造背景。深圳市建于深圳断裂带上,这里经过长期侵蚀,多已成为平原或谷地。是工程建设的良好场址。但基底破碎,增加了建设的投资和工程量;为确保城市的安全,仍应对深圳断裂带不同地段的近期活动性进行切实的监测。

A low intensity of crustal movement around the Shenzhen area has been shown by various determining methods, such as the amplitude and velocity of the differential uplifting and subsiding of the fault blocks, hydrothermal activities, activities of faults and seismicity since Neogene, especially since the Holocene. The fault zone does not provide the geological background for macroseismisms. An evaluation of the regional stabilily in the Shenzhen Fault block area shows that Shenzhen City belongs to a stable area. Despite the fact that Shenzhen City is located just in the Shenzhen Fault Zone and the basement in Shenzhen is very scattered tends to increase investment and amount of engineering work. the fault zone has undergone a long time of erosion and formed a broad alluvial plain. That is a good site for engineeeing construction. To ensure the safety of the city we should monitor the activities in different parts of the Shenzhen Fault Zone. It is recommended that land deformation geodetic measurement. including leveling and triangulation be carried out, and dating of active faults zone.