松坪沟活断层对地质灾害的影响

Impacts of the Songpinggou Active Faults on Geological Hazards

松坪沟流域地质构造复杂且发育断层,地质灾害频发,为研究松坪沟断层对地质灾害的影响;通过野外勘察、物探等方式对松坪沟主沟发育的松坪沟断层进行厘定,同时对该区地质灾害进行详细勘察分析。结果表明:松坪沟断层破裂带整体走向为北偏西,沿着松坪沟主沟发育,起始于茂县较场弧形构造带及其西侧,分为三段斜列式展布。地质灾害沿着断层的两侧呈带状分布,距离断层越近,地质灾害越发育且规模越大,断层两头的部分地质灾害发育集中。地质灾害发育的坡向与断层走向呈斜交,表明受到了断层长期活动的影响;地质灾害发育规模从断层南东段向北西段依次逐渐减少,进一步说明断层活动性依次减弱。

In Songpinggou watershed,characterized by its well-developed faults and frequent geological disasters,studies were conducted to investigate the impacts of the Songpinggou fault on these hazards.Field surveys and geophysical exploration methods were utilized to delineate the development of the fault along the main valley of Songpinggou,and detailed investigations of the geological hazards in the area were carried out.As a result,a better understanding of the fault′s influence on geological disasters was achieved,which provide a reference for the prevention and control of such hazards in the region.The research results are as follows.The overall trend of the rupture zone of the Songpinggou fault extends northwestward along the main valley of Songpinggou,starting from the arcuate structure zone in Mao County and its western side,and is divided into three segments arranged in a staggered manner.Geological disasters are distributed in a belt-like pattern along both sides of the fault,with a higher frequency and larger scale of disasters occurring closer to the fault,and a concentration of geological hazards at the endpoints of the fault.The development of geological disasters is seen to be oblique to the trend of the fault,indicating a long-term influence from the fault's activity;the scale of geological disaster development gradually decreases from the southeast end to the northwest end of the fault,further suggesting a gradual weakening of the fault′s activity.