论文部分内容阅读
本文概述郯城-庐江断裂带地震活动的地质构造背景和第四纪晚期断层新活动与地震的关系。指出沿带地震活动性具有明显的分段性,这与各段位于不同性质的大地构造单元和第四纪晚期断裂活动的差异性有较好的相关性。活断层粘滑运动的遗迹,是鉴别古地震及其重复发生的一种地质标志。同一活动构造带,强震有原地重演的可能。晚更新世以来发生过断层的粘滑运动,而二千多年来又无强震的“地震休眠段”,其危险性将比历史地震区(段)更紧迫。必须考查板内活断裂带强震重复活动的地质-地貌标志和年代学的研究。
This article summarizes the geological tectonic setting of the Tancheng-Lujiang fault zone seismic activity and the relationship between the late Quaternary fault activity and the earthquake. It is pointed out that the seismogenic activity along the belt has obvious segmentality, which is in good correlation with the difference of the tectonic units of different tectonic units in different stages and the fault activities in the late Quaternary. The remnant of the active-slip stick-slip movement is a geological marker for identifying the ancient earthquakes and their recurrence. The same event tectonic belt, strong earthquake may repeat itself. Slipped stick-slip movement occurred since the late Pleistocene, and the “earthquake hibernation segment” that has not been subjected to strong earthquakes for more than two thousand years will be more dangerous than the historical earthquake zone. The geologic-geomorphological signs and geochronology studies of repetitive activities of strong earthquakes in live intra-plate fractures must be examined.