Electronic Supplement to
Scaling Relationships of Source Parameters for Slow Slip Events

by Haiying Gao, David A. Schmidt, and Ray J. Weldon II

Table S1. Catalog of source parameters used in our exploration of scaling relationships.

Regions	Date	Length (km)	Width (km)	Mw	Duration (day)	Rise time (day)	Vrpt (km/s)	D (cm)	Δσ (MPa)	References
Cascadia	Jul-98	163	59	6.49	56	13	3.38E-05	2.62	0.02	(Schmidt & Gao, 2010)
	Aug-99	251	70	6.63	52	21	5.59E-05	2.13	0.01
	Dec-99	153	47	6.31	23	20	7.69E-05	1.75	0.01
	Dec-00	190	55	6.27	19	17	1.16E-04	2.65	0.03
	Apr-01	208	41	6.22	28	25	8.61E-05	0.95	0.01
	Feb-02	190	71	6.3	23	18	9.54E-05	1.67	0.01
	Feb 2003 N	70	41	6.08	15	13	5.44E-05	1.57	0.02
	Feb 2003 M	44	47	5.88	15	13	3.46E-05	1.08	0.01
	Feb 2003 S	167	59	6.2	19	10	1.02E-04	1.06	0.01
	Jan-04	72	47	6.01	13	12	6.39E-05	1.45	0.02
	May-04	159	71	6.37	37	17	4.97E-05	1.79	0.01
	Jul-04	92	76	6.21	32	11	3.33E-05	2.51	0.03
	Apr-05	66	59	6.15	16	14	4.77E-05	1.53	0.02
	Sep-05	101	94	6.44	45	18	2.60E-05	3.89	0.04
	Jan-06	99	47	6.06	11	5	1.05E-04	1.42	0.02
	Jul-07	41	58	5.88	20	15	2.36E-05	1.63	0.03
	Jan-07	188	71	6.26	26	12	4.19E-05	3.95	0.05
	May-08	291	80	6.4	40	16	4.21E-05	2.08	0.02
	Apr-09	188	100	6.41	46	9	4.72E-05	1.4	0.01
	Aug-09	292	88	6.39	54	20	6.26E-05	2.81	0.02
New Zealand	Oct-02	70	30		10		8.10e-5*	18?		Douglas et al. (2005)
	Jan 04-Jun 05	100	75	7	540		2.14e-7*	35?	0.09*	Wallace & Beavan (2006)
Japan	Nov-04	37	45	5.9	2		2.14e-4*	1.2	0.02*	Hirose & Obara (2006)
	Dec-04	30	29	5.8	3		1.16e-4*	1.8	0.03*
	Jul-05	41	41	5.7	4		1.19e-4*	0.8	0.01*
	Aug-03	71	56	6.8	90		9.13e-6*	10.9	0.10*	Hirose & Obara (2005)
		80	20	5.9	3		3.09e-4*	1.28	0.02*
		28	39	6	5		6.48e-5*	2.64	0.05*
	Nov-03	66	44	6.2	4		1.91e-4*	2.41	0.02*
	Feb-04	28	47	6	3.5		9.26e-5*	2.1	0.04*
	Apr-04	69	27	5.8	5		1.60e-4*	0.79	0.01*
	1996	60	60	6.6	300		2.31e-6*		0.06*	Hirose et al. (1999)
	Aug-02	48	36	5.8	4		1.39e-4*	3	0.01*	Obara et al. (2004)
		62	18	5.7	3		2.39e-4*	0.7	0.02*
	Jan-May 2006			3.3	1.16E-04				0.01*	Ito et al. (2007)
	2004 VLF			3.8					0.045	Ito & Obara (2006)
				3.9					0.034
				3.9					0.003
		7.5	7.5	4.1	1.16E-04	5.79E-05	0.98	0.6	0.001
				3.7					0.003
	1994 east	100	60	7.7	365		3.17e-6*	69.4	1.34*	Heki et al. (1997)
	1994 west	90	80	7.7	365		2.85e-6*	88.5	1.02*
	1997-2007	90	70	6.6	45		2.31e-5*	5.5	0.03*	Heki & Kataoka (2008)
	1996-1998	230	145	7.1	570		4.67e-6*		0.01*	Ozawa et al. (2007)
	2002-2004	230	145	7.1	660		4.03e-6*		0.01*
	tremor			4	0.0012	2.31E-04				Ide et al. (2008)
		15	5	1.6					6.80E-07	Ide et al. (2006)
	Long-term SSE	130	52	7.7				93.5	1.12*	Ueda et al. (2001)
		130	52	7.35				28	0.34*
	1989	100	50	7.37	10		1.16e-4*		0.56*	Kawasaki et al. (2001)
	1992	75	50	6.92	1.5		5.79e-4*		0.18*
	1994	150	70	7.67	365		4.76e-6*		0.52*
	Apr-06	66	36	6	3		2.54e-4*	1.2	0.02*	Shelly et al. (2007)
	1996-1998	232	100	7.2	365		7.36e-6*		0.03*	Miyazaki et al. (2003)
	Feb-99	17	13	5.6	9		2.19e-5*	3.4	0.13*	Nakagawa et al. (2000)
	May-96	50	50	6.4	7		1.16e-4*		0.05*	Sagiya (2004)
	2001			6.7	66					Sato et al. (2004)
	2000-2001			6.8	510				0.25*	Miyazaki et al. (2006)
	2003-2008	40	20	3.5					1.38E-05	Ito et al. (2009)
	Aug-01			6.7	66					Sato et al. (2004)
	2002			6	12					Maeda & Obara (2009)
	2003			6.1	13
	2005A			6	13
	2005B			6	10
	2006			6.1	8
	2007			5.9	11
	2007			3.6	2.00E-04					Matsuzawa et al. (2009)
				3.5	1.40E-04
				3.8	1.40E-04
				3.6	2.00E-04
	2008			3.1	4.00E-04					Takeo et al. (2010)
				3.1	8.70E-04
				2.7	4.30E-04
				2.4	2.20E-04
	Aug-02			6	6		1.60E-04			Hirose & Obara (2010)
	Aug-03			6.1	6		1.10E-04
	Apr-04			6.1	8
	May-05			6	5		9.26E-05
	Oct-05			6	3
	Apr-06			6.1	5		2.09E-04
	Mar-07			5.9	3
Mexico	2002	400	150	7.5					0.02*	Cotton et al. (2008)
	2006	230	150	7.5	180		1.48e-5*		0.05*
	2004	100	50	6.6	180		6.43e-6*		0.04*	Correa-Mora et al. (2008)
	2001	550	250	7.5	195		8.68e-5*	10	0.01*	Kostoglodov et al. (2003)
	1995-1996			7.1	240					Larson et al. (2004)
	1998	117	10	7.1	160	83	7.41e-6*		0.25*
	2006			7.1	30					Correa-Mora et al. (2009)
	2007			7	30
Alaska	1998-2001	550	440	7.2	1100		5.79e-6*	12-16.5	<0.01*	Ohta et al. (2006)
Costa Rica	2000	12		6.8	25.5		5.45E-06	300		LaBonte et al. (2009)
Hawaii	Nov-00	16	7	5.8	1.5		1.23E-04	6	0.74*	Montgomery-Brown et al. (2009)
	Sep-98	8.5	6.5	5.7	2		4.92E-05	5	1.52*	Segall et al. (2006);
	Dec-00	20	15	5.6	1.5		1.54E-04		0.09*	Montgomery-Brown et al. (2009)
	Jul-03	11.5	10	5.4	1.5		8.87E-05		0.18*
	Jan-05	17.5	10	6	2.2		9.20E-05	15	0.42*
San Andreas Fault	Dec-92			4.8	7					Linde et al. (1996)
	Dec 1999(E&C)	2.3	0.3				2.00E-04	0.5	0.34*
	Dec 1999(C)	1.7	2.7				3.50E-04	2.8	0.74*
	Dec 1999(A)	8	4					0.33	0.03*
	Dec 1999(B)	8	4					0.45	0.05*
	Dec 1999(D)	8	4					0.89	0.09*

* indicates values we have calculated based on what is reported by the original authors.

Note: The average static stress drop is estimated by assuming Mo=μD A, Δσ=16/(3π)*μD /W, and L=2W for a rectangular fault.

The average rupture velocity is calculated by dividing the rupture length by the event duration.

In Figure 3, the data for a slow-earthquake sequence in Japan (plus symbol) is from the courtesy of S. Ide (see Ide et al., 2008). The short-term slow slip events (small open circles) are from the table by Sekine et al. (2010).

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