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在更深的卡斯卡迪亚沉降接口上发生了一场无声滑动事件
1Geological Survey of Canada, Pacific Geoscience Centre, 9860 West Saanich Road, Sidney, British Columbia, Canada V8L 4B2. dragert@pgc.nrcan.gc.ca
概括
连续全球定位系统的数据显示,由于卡斯卡迪亚潜伏断层被锁定,不列颠哥伦比亚省和华盛顿州的陆地运动. 1999年的一次事件显示了无地震滑动,表明断层界面上的离散脉冲运动.
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
- 地震学 地震学
背景情况:
- 在不列颠哥伦比亚省西南部和华盛顿州西北部的全球定位系统 (cGPS) 站点显示陆地运动.
- 这种运动归因于海上卡斯卡迪亚沉降断层的锁定状态.
- 卡斯卡迪亚沉降区是一个主要的构造界限,能够产生大地震.
研究的目的:
- 为了调查1999年发生的异常事件,其中几个cGPS站点的运动方向逆转.
- 了解卡斯卡迪亚潜伏断层突然无地震移动背后的机制.
- 为了提供证据,在潜水接口的更深,更热的部分出现了偶尔的滑动.
主要方法:
- 来自不列颠哥伦比亚省西南部和华盛顿州西北部的全球定位系统 (cGPS) 连续数据的分析.
- 地测测量以检测地面的移位.
- 断层滑动的建模,以解释观察到的表面运动.
主要成果:
- 七个cGPS站点的集群在1999年夏天短暂地逆转了它们的运动方向.
- 在此事件期间没有检测到相关的地震性.
- 这些位移是由从地震带向下倾斜的俯冲界面的50公里×300公里面积约2厘米的无地震滑动解释的.
- 这次滑落事件相当于6.7级地震.
结论:
- 这项研究提供了证据,表明在卡斯卡迪亚潜伏接口的更深的塑料部分发生了无地震滑动.
- 这些无地震滑动事件可以在离散脉冲中发生.
- 这种脉冲有助于巨型冲击地震区域的应力负荷,可能会影响未来的大型地震的时间和强度.
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