摘要
初步探讨了19871990年我国东部地形变场的分布特征及其与现代地壳垂直运动、地震带和中强地震震中分布的关系,并进行了典型个例分析.结果表明:现代地壳活动强烈区亦是地形变凸、凹中心的高发区,地凸、凹中心的分布与中强地震震中和地震带的分布比较吻合,地震易发生在地凸、凹区的接合部,也即水平切应力最大的地区.闽粤地区的地形变场可以捕捉到台湾的强震信息.两个(或多个)地凸区的突然增强或合并对大震有临界促发作用.
Basic features of the earth deformation field, especially the convex/concave area, in East China during 1987~1990 and relationship among distributions of deformation field, crustal movement, seismic belt and epicenters of middlestrong earthquakes are discussed,then some typical cases are analyzed.The results show that the convex/concave area tends to be centered at the region with intense vertical movement. Earthquakes prefer occurring at the copulae between convex and concave areas,which are also the areas with strongest horizontal shear stress. Some information of strong earthquake in Taiwan can be reflected in deformation fields in Fujian and Guangdong provinces.Enhancement or mergence of two or more convex areas may play an important role in triggering occurrence of strong earthquake.
出处
《西北地震学报》
CSCD
北大核心
2003年第2期112-118,共7页
Northwestern Seismological Journal
基金
中国科学院"王宽诚博士后工作奖励基金"成果
关键词
地形变场
地凸区
地凹区
地震
地热涡
Earth deformation field
Convex area
Concave area
Earthquake
Geothermal vortex
