January 2007 Northern Cascadia Slow Slip Event

This page summarizes deformation detected on the Pacific Northwest GPS Array during the January, 2007 slow slip event. In the figures below, which link to larger versions, are: the finalized longitude positions, the final latitude positions, a vector diagram showing how each GPS station within the Pacific Northwest Geodetic Array moved during the slow slip event, and a mathematical estimation of the amount of fault slip that took place during the slow slip event. The maximum amount of fault slip estimated is 3.1 cm, and the total energy released during the 3 weeks from Jan 15-February 2 was equivalent to a regular earthquake of magnitude 6.7. The white stars on the right hand figure show the estimated locations of seismic tremor deduced from the PNSN (provided courtesy of Aaron Wech and Ken Creager).