LATEST UPDATE ON 2005 SILENT EARTHQUAKE AND DEEP TREMOR

Slow earthquakes affecting southern British Columbia and northern Washington have been occurring every 14 months or so over the last 10 years. The PNSN has deployed additional seismometers to record expected tremor events to gain insight into the process and into the stresses that eventually will lead to the region's next major earthquake

REFERENCE:http://www.pnsn.org