Structure of the Managua graben, Nicaragua, from remote sensing images

Structure of the Managua graben, Nicaragua, from remote sensing images
复制标题

遥感图像显示尼加拉瓜马那瓜地堑的结构

DOI：
--
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
A. Frischbutter
A. Frischbutter
中科院分区：
--
文献类型：
--
作者：
A. Frischbutter

文献摘要

被引文献

相似文献

根据遥感解释，结合 1972 年地震的地震数据，马那瓜断裂带被视为具有区域重要性的南北走向的复合结构。马那瓜断裂带的东缘由低阶、南北走向的地堑结构形成，例如马那瓜地堑或机场地堑，其边界是倾斜断层。随着正断层活动的增加，这些南北向断层上的横向运动强度似乎向东减弱。近年南北向断裂的侧向成分主要为右旋。与尼加拉瓜凹陷的西北向边缘断层相结合，这代表了马那瓜断层带的压变形机制。 1972 年马那瓜地震的地震数据清楚地表明了 NNE 至 NE 走向结构的左侧运动分量（马那瓜地堑、机场地堑等下部结构内的延伸）。 N 向、NW 向和 NE 向平面应被视为最近在该地区活跃。地震危险性评估必须考虑这些运动学关系： NE – 趋势面由于其伸展状态而被强调。据推测，在 1972 年的事件中，只有马那瓜地堑的西部部分被激活。近期地堑东缘应力集中程度较高可能是其后果之一。
From remote sensing interpretations, combined with seismological data of the 1972 earthquake, the Managua Fault Zone is seen as a N-S - trending, composite structure of regional importance. The eastern margin of the Managua Fault Zone is formed by lower-order, N-S - trending graben structures such as the Managua graben or the Airport graben, which are bordered by oblique faults. The intensity of lateral movements on these N-S trending faults seems to decrease to the east as normal faulting increases. Lateral components on N-S trending faults are mainly dextral in recent times. In combination with the NW - trending marginal faults of the Nicaragua depression this represents a transpressional regime for the Managua Fault Zone. Components of left lateral movements on NNE- to NE - trending structures are clearly indicated from seismological data for the 1972 Managua earthquake (extension within substructures like the Managua graben, Airport graben). N-, NW- and NE - trending planes should be regarded as recently active in the region. These kinematic relations must be taken into account for seismic hazard assessment: NE – trending planes are emphasized because of their extensional regime. It is postulated that during the 1972 event only the western part of the Managua graben was activated. Higher recent stress concentration along the eastern margin of the graben may be a consequence, among others.