Slow slip hidden in the noise: the intermittence of tectonic release. Slip rate and tremor genesis in Cascadia. Holocene earthquake records from the Cascadia subduction zone and northern San Andreas fault based on precise dating of offshore turbidites.
Deformation cycles of subduction earthquakes in a viscoelastic earth. Automated detection and location of Cascadia tremor. Northern Cascadia episodic tremor and slip: a decade of tremor observations from 1997 to 2007. Spatial–temporal patterns of seismic tremors in northern Cascadia. Space–time correlation of slip and tremor during the 2009 Cascadia slow slip event. Seismic and geodetic constraints on Cascadia slow slip. Seismic and aseismic slip on the Central Peru megathrust. Episodic tremor and slip on the Cascadia subduction zone: the chatter of silent slip. Nonvolcanic deep tremor associated with subduction in southwest Japan. We posit that this provides indirect real-time access to fault physics on the down-dip portion of the megathrust, and thus may prove useful in determining if and how a slow slip may couple to or evolve into a major earthquake. Using a method based on machine learning previously developed in the laboratory, we analysed large amounts of raw seismic data from Vancouver Island to separate this signal from the background seismic noise. Here we show that the Cascadia subduction zone is apparently continuously broadcasting a low-amplitude, tremor-like signal that precisely informs of the fault displacement rate throughout the slow slip cycle.
In the clearest cases, such as Cascadia, identified tremor occurs in discrete bursts, primarily during the slow slip event. Slow slip and associated tremor are common to many subduction zones, and occur down-dip from the neighbouring locked zone where megaquakes take place. Tectonic faults slip in various manners, which range from ordinary earthquakes to slow slip events to aseismic fault creep.
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