汇聚边界连续的大地测量结果显示,深部瞬时蠕变事件可释放大量的应变能而不产生可测震动,因而这种地震被称之为慢震或寂静地震。因为最大地震产生于消减带,所以了解慢震在多大程度上降低罕见大地震释放的能量,对地震危险性的评估至关重要。下面我们提供的资料说明发生在卡斯凯迪亚慢震的周期性和目前正在发生的这样一个地震。 Consecutive geodetic measurements at converging boundaries show that deep transient creep events can release a large amount of strain energy without producing measurable vibrations and are therefore known as slow or silent earthquakes. Because the largest earthquakes occur in the abatement zone, understanding how slow earthquakes reduce the energy released by rare large earthquakes is critical to assessing the seismic hazard. The information we provide below illustrates the cyclical nature of the slow earthquake that occurred in Cascadia and the ongoing earthquake such as this one.