Peroidic Slow Earthquakes from the Cascadia Subduction Zone

摘要

Continuous geodetic measurements from convergent margins have shown that deep transient creep events can release large amounts of strain energy without detectable seismic shaking, and they are thus known as slow or silent earthquakes. Because subduc- tion zones generate the largest earthquakes, seismic hazard assessment relies on under- standing the degree to which slow earth- quakes reduce the energy released by infre- quent large earthquakes. We present data that indicate the periodicity of slow earthquakes in Cascadia and the current onset of such an event.