南京大学学报(自然科学版) ›› 2019, Vol. 55 ›› Issue (5): 869878.doi: 10.13232/j.cnki.jnju.2019.05.021
• • 上一篇
吴珍云1,2,3(),尹宏伟4,李长圣1,2,孙业君3,李丽梅3,杜航3,何奕成3,刘博雅3
Zhenyun Wu1,2,3(),Hongwei Yin4,Changsheng Li1,2,yejun Sun3,Limei Li3,Hang Du3,Yicheng He3,Boya Liu3
摘要:
通过分析茅东断裂带地质构造和历史地震特征,结合离散元模拟实验,分析了挤压应力下断陷盆地构造反转及断裂活动特征,探讨了茅东断裂带作为断陷盆地在现今区域应力场作用下反转构造特性及正断层反转控震机制.结果表明:(1)挤压应力下,断陷盆地发生构造反转,促使盆地中先存正断层再活化以及浅部地层褶皱变形,但盆地中先存断层总体仍保持正断形态;(2)构造反转过程中,应力应变汇聚易优先发生在基底断层面上,并逐渐向沉积地层中传播,最终在浅表触发构造形变;(3)茅东断裂带属于活动断裂群,以茅东断裂等控盆边界断裂(基底断裂)活动为主,沿着该类断裂,应力应变汇聚明显,具备中、大地震的发震构造条件;断陷内其他隐伏的次级先存断裂也存在活动可能性,且断块间地层在压扭应力场下存在应力应变汇聚,同样具备浅源小震的发震构造条件.
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