火山弧刚度变化被2011年东北奥基M9的共震变形所照亮
Simone Puel1,2, Thorsten W Becker1,2,3, Umberto Villa3
1Department of Earth and Planetary Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX 78712, USA.
Science advances
|June 5, 2024
概括
研究人员利用地震数据绘制了地下岩石特性. 他们发现了与火山活动和构造板结构相关的软岩区,改善了我们对地球动态的理解.
科学领域:
- 地质物理学 地质物理学
- 固体地球动力学 固体地球动力学
- 地震学 地震学
背景情况:
- 岩石强度会影响石质层变形和地震性.
- 弹性异质性为固体地球动力学提供了至关重要的见解.
- 缺乏对弹性特性的独立约束.
研究的目的:
- 通过使用全球导航卫星系统 (GNSS) 的共地震数据,同时推断弹性结构和断层滑动.
- 为了研究弹性异质和构造过程之间的关系.
- 在地球科学中探索多物理逆转的新方法.
主要方法:
- 利用来自2011年M9东北地震的全球导航卫星系统 (GNSS) 的数据.
- 应用一个反向方法,同时确定弹性结构和断层滑动.
- 整合地球物理数据用于多物理逆转.
主要成果:
- 在火山弧下面和100公里以上的地幔中确定了符合标准的 (软) 材料,与部分融化区域相关.
- 在沟附近检测到低刚度的材料,与地震性模式和可能的增积形结构相关.
- 证明了GNSS数据限制地下弹性特性的能力.
结论:
- 该研究为弹性异质性提供了新的约束,将其与地质结构和地震活动联系起来.
- 开发的反向方法为地震学和火山科学中的多物理反向提供了一种新的方法.
- 未来与InSAR等技术的整合可能会增强对过渡性岩层变形的理解.
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