对于地震带的压力溶液流量定律:适用于卡斯卡迪亚
1Department of Geosciences, The Pennsylvania State University, University Park, PA 16802, USA.
Science advances
|January 24, 2024
概括
这项研究提出了一个新的流量定律,用于压力溶液在俯冲区,改善预测的地震间行为和预弧滑落赤字. 该模型与古代俯冲区和卡斯卡迪亚的地质观测相一致.
科学领域:
- 地质物理学 地质物理学
- 构造学 构造学 构造学 构造学
- 类风病学 类风病学 类风病学
背景情况:
- 压力溶液是沉积岩中的一个关键的变形机制.
- 了解浮沉沉积物的形学对于建模地震和无地震过程至关重要.
- 之前的模型没有详细纳入压力和温度对溶性的影响.
研究的目的:
- 开发压力溶液的线性粘性构成关系.
- 使用范特霍夫关系将压力和温度的依赖性与二氧化的溶解度结合起来.
- 运用这种流量定律来预测潜伏区,特别是卡斯卡迪亚的地震间行为.
主要方法:
- 开发了压力溶液的线性粘性构成关系.
- 使用实际的范特霍夫关系参数化的溶解度,包括压力和温度的依赖性.
- 将导出的流量定律应用于卡斯卡迪亚俯冲区,利用现有的热结构,几何,板速和GPS数据的数据.
主要成果:
- 开发的流量规律与地震带的上升极限附近的沉积泥石中的柔性应变相一致.
- 结果表明,相对板块运动在地震带的下沉极限附近被粘性变形所适应.
- 流量定律成功地预测了观察到的滑动率赤字随着深度的逐渐缩小.
结论:
- 新的线性粘性流量定律为理解潜水区压力溶液提供了强大的框架.
- 该模型增强了对地震间变形和滑动缺陷分布的预测.
- 这些发现对地震危险评估和俯冲区动态有重大影响.
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