摘要
研究和剖析了两次溧阳地震孕育和发生的主要地质因素 :新生代茅东裂陷盆地 ;茅东与南京—溧阳两玄武岩喷发带的交汇 ;茅东断裂带最活动的上沛带 ;震源区地壳层圈构造 (深、浅变质岩界面和低速层 )与茅东断裂带中、深脆—韧性剪切段的复合。探讨了控制溧阳地震震级的因素 :茅东断裂带属Ⅱ级断裂 ,茅东裂陷盆地属中、小型裂陷盆地。因此 ,决定溧阳地震震级为 5 0～ 6 0的中强地震。
The main geological factors for the earthquakes took place twice in Liyang are studied and analyzed in the paper:Maodong fracture basin of Cenozoic era; the intersection of the two basalt eruptive zones of Maodong and Nanjing to Liyang; the most active Shangpei belt within Maodong fault belt; the composition of the crustal layer structure (hypo and epi metamorphic rock interface as well as low velocity layer) in the earthquake source with the moderate and deep brittle to ductile shear zones of Maodong fault belt. The scale controlling factors for Liyang earthquakes are also discussed in the paper:Maodong fault belt is attributed to class Ⅱ fault belt, Maodong fracture basin in attributed to middle and small scale fault basin. So, the earthquake scale of Liyang is determined to be 5 0～6 0 which belong to medium strong earthquake.
出处
《江苏地质》
2001年第1期11-16,共6页
Jiangsu Geology
关键词
地震
成因
茅东裂陷盆地
茅东断裂带
地壳层圈构造
震源层
江苏
Earthquake
Origin
Maodong fracture basin
Maodong fault belt
Crustal layer structure
Earthquake focus layer
Liyang,Jiangsu
