Electronic Supplement to
A Historical Review of Induced Earthquakes in Texas

by Cliff Frohlich, Heather DeShon, Brian Stump, Chris Hayward, Matt Hornbach, and Jacob I. Walter

Table S3. Compilation of Focal Mechanisms and Moment Tensors Reported for Texas Earthquakes

Date and (yyyy/mm/dd)	Origin Time (hh:mm:ss)	Tpm*	Taz*	Tdip*	Bpm*	Baz*	Bdip*	Ppm*	Paz*	Pdp*	Moment†	Source‡	Location
1931/08/31	11:40:22		318	8		56	44		270	45	3.30 × 1025	D87	Valentine
			258	25		78	65		168	0		D80
			236	30		143	5		45	60		ST74
1978/06/16	11:46:54		329	9		64	27		222	61		VH80	Snyder
			329	10		64	26		219	62		SLM
1992/01/02	11:45:36		159	70		339	20		249	0		S93	Rattlesnake Canyon
1995/04/14	00:32:56	3.77	205	8	0.10	295	3	−3.87	44	82	3.82 × 1024	CMT	Alpine
		3.93	207	15	0.01	116	1	−3.94	21	75	3.90 × 1024	NEIC
2008/04/07	09:51:13	7.76	322	0	0.00	52	7	−7.76	228	82	7.80 × 1021	SLM	Falls City
2008/10/14	03:07:28	4.78	18	17	0.00	283	14	−4.79	156	66	4.80 × 1021	USGS	Miami
2010/02/04	09:41:28	1.04	7	1	0.00	98	51	−1.05	276	38	1.00 × 1021	NEIC	Vega
2010/08/08	01:12:38	1.43	321	6	0.00	227	35	−1.43	60	53	1.43 × 1021	NEIC	Snyder
2011/03/13	20:16:21	6.53	133	7	0.00	227	34	−6.53	33	55	6.50 × 1021	NEIC	Snyder
2011/09/11	12:27:44	3.94	164	11	−0.64	26	75	−3.30	256	10	3.70 × 1022	NEIC	Snyder
			339	11		219	69		73	17		SLM
2011/09/12	14:18:34	2.32	336	8	0.00	232	61	−2.32	70	28	2.30 × 1021	SLM	Snyder
2011/10/20	12:24:42	1.42	328	5	0.39	60	19	−1.87	225	71	1.80 × 1022	GCMT	Fashing
		1.78	145	27	0.03	53	1	−1.80	318	63	1.80 × 1022	NEIC
2012/05/10	15:15:40	10.40	41	26	−1.10	174	54	−9.30	299	23	9.80 × 1021	NEIC	Timpson
2012/05/17	08:12:01	2.53	18	14	0.13	140	64	−2.66	282	21	2.59 × 1023	GCMT	Timpson
		2.21	7	27	0.00	240	50	−2.21	113	27	2.20 × 1023	NEIC

^*Columns labeled Tpm, Taz, and Tdip are principal moment, azimuth, and plunge of the T axis; similarly notation is used for the B and P axes. Entries in which Tpm, Bpm, and Ppm are absent indicate events in which only focal mechanism was reported.

^†Tabled value for moment is given in units of dyn·cm.

^‡Key for sources: CMT, Centroid Moment Tensor (Harvard); D80, Dumas et al. (1980); D87, Doser (1987); GCMT, Global Centroid Moment Tensor; NEIC, National Earthquake Information Center; S93; Sanford et al. (1993); SLM, St. Louis University moment tensors (Herrmann et al., 2011); ST74, Sanford and Toppozada (1974); USGS, U.S. Geological Survey; VH80, Voss and Herrmann (1980).

[ Back ]