Cascadia Slow Slip Catalog

This catalog includes large events (Mw > 6) inferred from the time dependent inversion of 3-component GPS time series. Events on central and southern Cascadia are poorly resolved (and not included) because of the sparse GPS network prior to ~2007.

Date	Location#	Mw	Ave Slip$
Jul 1998	Port Angeles	6.5	2.6 cm
Aug 1999	Port Angeles	6.6	2.1
Dec 1999	SW Washington	6.3	2.4
Dec 2000	Port Angeles	6.3	2.6
Apr 2001	SW Washington	6.2	1.5
Feb 2002	Port Angeles	6.3	1.7
Feb 2003%	SW Washington	6.2	1.7
Feb 2003%	Olympia	5.9	1.5
Feb 2003%	Port Angeles	6.1	2.1
Jan 2004	Port Angeles	6.0	2.1
May 2004	SW Washington	6.4	2.7
Jul 2004	Port Angeles	6.2	2.5
Apr 2005	Tacoma	6.2	2.2
Sep 2005	Port Angeles	6.4	3.9
Jan 2006	SW Washington	6.1	1.9
Jan 2007	Port Angeles	6.3	3.9
Jul 2007	S Oregon	5.9	2.7
May 2008	Port Angeles	6.4	2.1
Apr 2009	Port Angeles	6.7	1.4
Aug 2009	Portland	6.4	2.8
Aug 2010	Port Angeles

# Approximate location of event or where maximum fault slip is inferred.
$ Values represent the average slip for fault elements with slip greater than 0.5 mm.
% The 2003 event has been divided into 3 distinct sub-events which are separated in time.

sliprate_1998-2008.mov

Movie file showing the distributed slip rate on the plate interface for consecutive events.

For more information, refer to:

Schmidt , D. A. and H. Gao (2010), Source parameters and time-dependent slip distributions of slow slip events on the Cascadia subduction zone from 1998 to 2008, J. Geophys. Res., 115, B00A18, doi:10.1029/2008JB006045. Abstract

Gao, H., D. A. Schmidt, and R. Weldon (2012), Scaling relationships of source parameters for slow slip events Bull. Seis. Soc. Am., 102, 1, 352-360, doi:10.1785/0120110096. Abstract | Supplementary Table