Deep Tremors and Slow Quakes.

This article discusses how research facilitating the increased understanding of slow earthquakes may provide a more complete understanding of the processes associated with ordinary earthquakes. The term slow earthquake encompasses a number of phenomena, including slow-slip events and very-low-frequency earthquakes. Slow earthquakes are typically accompanied by deep tremor and occur as shear slip events of tectonic plates. These tremors can be sensitive to small variations in geophysical stress, as they have been triggered by lunar tides. Monitoring of tremor phenomena via seismic stations is discussed, and peculiarities associated with the San Andreas Fault are elucidated.