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活动断层探测作为减轻地震灾害而开展的一项重要工作,一直被人们所关注.高密度电法已广泛应用于地质调查中,为了进一步认识高密度电法不同装置的探测效果及活动断层探测的高密度电法装置的有效选择,本文进行了温纳装置、二极装置、偶极—偶极装置、三极装置和温施装置的理论模型正反演研究,以及常用的温纳装置、温施装置和偶极—偶极装置的实例应用研究与分析.(1)基于断层是否穿过第四系判断断层活动的前提,理论模型模拟表明高密度各装置均可进行活动断层的定性探测和进行地质分层,而表层为相对高阻层的地层结构有利于进行地质分层,其精度高于表层为相对低阻层的地层结构;(2)模型模拟表明高密度偶极—偶极装置进行活动断层的定性探测和地质分层是最有效的装置,三极装置次之;(3)理论模拟和实例应用表明,高密度偶极—偶极装置对活动断层的响应最敏感,可有效确定其性质,这与理论模拟结果完全相符,因此实际应用时宜采用偶极—偶极装置进行活动断层的探测.
Active fault detection has been attracting attention as an important work to mitigate the earthquake disaster.High-density electrical method has been widely used in geological survey. In order to further understand the detection effect of high-density electrical method and active fault detection In this paper, the forward and inverse theoretical models of WENER device, diode device, dipole-dipole device, three-pole device and temperature-applying device are studied, as well as the common WENNA device, temperature (1) Based on the premise of whether the fault passes through the Quaternary to judge the fault activity, the theoretical model simulation shows that all devices with high density can conduct qualitative detection of active fault and (2) Model simulations show that the high-density dipole-dipole device is more suitable for geological stratification than the high resistivity layer The qualitative detection and geological stratification of the active fault are the most effective devices, followed by the tripolar device. (3) Theoretical simulation and practical application show that the high density dipole-dipole device The dynamic response of the fault is the most sensitive, and its properties can be effectively determined. This is in good agreement with the theoretical simulation results. Therefore, the dipole-dipole device should be used to detect active faults in practical applications.