论文部分内容阅读
2010年6月28日至8月中旬,广西凤山县至凌云县一带发生3级震群活动(简称“6·28”震群,亦称凌云—凤山3级震群活动),该震群震源浅、频次高、烈度大、灾害重。“6·28”震群发生于包容式岩溶区,该区降雨集中,地下水暴涨暴落,受地层岩性、地质构造及外源水的控制,岩溶发育强烈,巨大洞穴多处可见,尤其发现多处岩溶反虹管。文章通过对地震时的表象现象调查及深入研究当地岩溶水文地质条件,发现“6·28”震群震区存在岩溶气爆地震及岩溶陷落地震的有利条件,并通过研究期间的监测验证,认为“6·28”震群存在岩溶气爆地震及岩溶陷落地震,属暴雨诱发的岩溶震群活动。
From June 28, 2010 to mid-August 2010, a magnitude 3 earthquake swarm (or “6 · 28” swarm, also known as Lingyun-3 Fengshan earthquake swarm) occurred in Fengshan County, Guangxi Province, The epicenter of the epicenter is shallow, with high frequency, strong intensity and heavy disasters. The “June 28” earthquake swarm occurred in an encased karst area, where rainfall concentrated and groundwater surged. Due to the lithology, geological structure and exogenous water control, the karst developed strongly and huge caves were found everywhere, especially Find a number of karst reverse pipe. By investigating the phenomenon of earthquakes and studying the hydrogeological conditions of the karst area, the article finds that there are some favorable conditions for karst gas explosion and karst collapse earthquake in the earthquake area of “6.28” earthquake. Through the monitoring and verification during the research period It is considered that the karst gas burst earthquake and karst collapse earthquake exist in the “June 28” earthquake swarm, which belongs to rainstorm-induced karstification swarm activity.