与苏门答腊-安达曼大地震相关的板块边界变形
Cecep Subarya1, Mohamed Chlieh, Linette Prawirodirdjo
1National Coordinating Agency for Surveys and Mapping, Cibinong 16911, Indonesia.
2004年苏门答腊-安达曼地震造成了严重的地面移位,原因是桑达大震沿线发生了大规模破裂. 后地震滑动持续了几个月,特别是在造成毁灭性海的浅断层上.
科学领域:
- 地质物理学 地质物理学
- 地震学 地震学
- 构造学 构造学 构造学 构造学
背景情况:
- 2004年苏门答腊-安达曼地震 (Mw > 9.0) 是现代地质测量和地震学的发展后发生的一次罕见的巨大事件.
- 这一事件为研究大规模地震的特征提供了独特的机会.
研究的目的:
- 为了估计2004年苏门答腊-安达曼地震造成的地面移位.
- 为了分析这个巨大的地震的断裂特征和滑动分布.
主要方法:
- 全球定位系统 (GPS) 在苏门答腊西北部的近场调查.
- 在现场和远程观察珊瑚礁垂直运动.
- 地测和地震滑坡数据的比较.
主要成果:
- 桑达海底沉降巨型冲压的破裂延伸超过1500公里,宽度<150公里.
- 超级冲击滑落超过了苏门答腊北部海域20米,主要是在深度<30公里处.
- 在断裂后的1.5个月内,另外30%的断层滑落发生在无地震的过程中.
结论:
- 浅处的大冲击滑落,特别是阿切海起源的地方,是显著的.
- 断裂在西梅鲁岛附近突然结束,这是核形成区和前一次地震的地点.
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