概括
圣安德烈亚斯断层系统上的地震滑落在冲击滑落和俯冲滑落断层之间共享. 这种滑动分区受断层沉降的影响,会影响断层滑动率的估计.
科学领域:
- 地质物理学和构造学
- 地震学 地震学
- 结构地质学 结构地质学
背景情况:
- 圣安德烈亚斯断层 (SAF) 系统通过突击滑动和俯冲滑动的组合来适应构造趋同.
- 最近的大型地震 (棕泉,科林加,洛马普里塔) 提供了关于SAF系统中复杂的滑动分区的见解.
- 了解滑动分布对于准确的地震危险评估和断层滑动率计算至关重要.
研究的目的:
- 为了调查跨越圣安德烈亚斯断层系统的地震滑动的分割.
- 为了确定断层倾斜和摩擦特性在地震期间对滑动方向的影响.
- 通过纳入活跃的滑断层的贡献,重新评估断层滑动率.
主要方法:
- 从最近的大型地震中滑动分布的分析 (M) 6.0棕泉,M) 6.7科林加,M) 7.1洛马普里埃塔).
- 模拟滑动分区,基于尽量减少对摩擦所做的工作的原则.
- 断层滑动率的估计,考虑垂直冲滑和平行滑断层贡献.
主要成果:
- 整个SAF系统的滑动趋同被分为主要的垂直冲滑断层和并行滑断层.
- 最近地震的滑动方向主要由断层沉降控制,这表明断层之间正常应力和摩擦系数 (微) 的变化.
- 纳入活跃的滑断层可以显著降低垂直SAF的估计滑动率,在洛马普里塔段约为50%,在北棕斯普林斯段为100%.
结论:
- 滑板隔离是圣安德烈亚斯断层系统中规范变形的关键机制.
- 断层沉降和摩擦特性在地震事件期间的滑动行为中起着重要作用.
- 准确估计断层滑动率需要明确考虑相关的滑结构上的滑动.
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