在表面负荷的冰川间冰川变化期间,正常断层的滑动率变化
1Institute of Geology, Department of Earth Sciences, ETH Zurich, Sonneggstr. 5, 8092 Zurich, Switzerland. rahetzel@uni-muenster.de
Nature
|May 6, 2005
概括
地球 地球 地球 地球 地球 地球
科学领域:
- 地质物理学 地质物理学
- 古代地震学 (paleoseismology) 是一种古地震学.
- 四年纪地质学四年纪地质学
背景情况:
- 地质数据显示,在晚期普世/早期全新世期间,Wasatch和相邻的正常断层的滑动率增加.
- 这种同步加速和全新世纪地震集群的原因尚不清楚.
- 断层滑坡加速与波恩维尔湖在最后一次冰川最大化后收缩之间的潜在联系已被提出.
研究的目的:
- 评估后冰川卸载和石层反弹在断层滑坡加速中的作用.
- 为了研究气候控制的表面负荷变化对断层行为的影响.
主要方法:
- 一个离散的正常故障的有限元建模.
- 在一层层的石化层中进行分析.
主要成果:
- 石质层反弹,由波恩维尔湖的回归和山脉脱冰驱动,是高Holocene断层率的可行机制.
- 后冰期卸载降低了滑动率,而石灰岩层反弹促进了更快的滑动.
结论:
- 气候驱动的表面负荷变化显著影响正常断层滑动历史.
- 石质层反弹为Holocene期间Wasatch地区加速断层滑落提供了一个合理的解释.
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