地震滑落在海洋转变断层上的错误
1Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, USA. rachel@seismology.harvard.edu
Nature
|March 10, 2001
概括
通过分析地震深度和破裂机制,可以更好地理解海洋转变断层的滑动. 以前报道的地震前的缓慢滑动前体可能是建模文物.
科学领域:
- 地球科学 地球科学 地球科学
- 地震学 地震学
- 板块构造学是一种板块构造学.
背景情况:
- 海洋转变断层是关键板边界,但它们的滑动行为不太了解.
- 之前的研究表明,缓慢的地震断裂和可检测的缓慢滑动在海洋转变地震之前发生.
- 了解这些过程对地震预测有影响.
研究的目的:
- 为了研究罗曼切和链转变断层的地震深度和破裂机制.
- 为了确定海洋石化层中脆性失效的最大深度.
- 重新评估1994年罗曼切地震及其潜在的前体.
主要方法:
- 模拟身体波的宽带地震图.
- 分析罗曼什河和链转变断层上发生的14次地震.
- 重新计算1994年罗曼切地震的源光谱.
主要成果:
- 罗曼施变换中的地震系统地比链式变换中的地震更深.
- 在海洋石化层中,脆性失效的最大深度约为600°C.
- 1994年罗曼切地震的体波是通过单个断层的深度滑动很好地模拟的.
结论:
- 之前报道的1994年罗曼切地震的缓慢滑动前体可能是模型不确定性的产物.
- 地震深度和破裂机制为海洋转变断层行为提供了关键的见解.
- 这项研究完善了我们对海洋石化层脆性失败的理解.
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