Electronic Supplement to
Location of Aftershocks of the 4 April 2010 M_w7.2 El Mayor-Cucapah Earthquake of Baja California, Mexico

by Raul R. Castro, Jose G. Acosta, Victor M. Wong, Arturo Perez-Vertti, Antonio Mendoza, and Luis Inzunza

The following material is provided in this supplement:

• Station list
• Hypocenter list

Table S1. Coordinates of the Stations of the Local Seismic Network

Station (code)	Latitude (Deg Min)	Longitude (Deg Min)	Altitude (mts)
LS01	31 51.35N	115 11.38W	11
LS02	32 02.90N	115 14.83W	18
LS03	32 12.32N	115 19.15W	12
LS04	32 23.73N	115 21.05W	33
LS05	32 30.13N	115 17.80W	13
LS06	32 31.45N	115 25.86W	14
LS07	32 33.16N	115 35.45W	10
LS08	32 35.19N	115 45.52W	40
LS09	32 27.93N	115 44.64W	5
LS10	32 18.68N	115 41.97W	00
LS11	32 08.79N	115 31.76W	00
LS12	32 03.74N	115 25.63W	3
LS13	31 56.03N	115 24.07W	17
LS14	31 50.58N	115 17.06W	10

Table S2. Hypocenter List. Coordinates of the best relocated aftershocks of the El Mayor-Cucapah M_w7.2 earthquake.

Yr	Mn	Day	Hr	Min	Sec	Lat (°)	Lon (°)	Depth (km)
10	04	06	21	06	17.29	32.4153	-115.5104	08.46
10	04	06	21	10	52.74	32.2977	-115.3189	11.00
10	04	06	21	26	18.13	32.3364	-115.3637	04.05
10	04	06	21	35	08.08	32.2403	-115.1943	20.14
10	04	06	21	37	16.82	32.3641	-115.3820	13.22
10	04	06	21	47	05.91	32.2673	-115.2902	12.91
10	04	06	21	56	14.17	32.2047	-115.2431	13.93
10	04	06	22	05	56.52	32.6127	-115.6991	03.61
10	04	06	22	09	09.19	32.6186	-115.7172	02.11
10	04	06	22	13	23.77	32.2630	-115.3276	10.20
10	04	06	22	28	18.77	32.3245	-115.3614	10.22
10	04	06	22	50	50.28	32.3800	-115.7723	21.69
10	04	06	23	02	36.87	32.3146	-115.3064	06.36
10	04	06	23	06	44.68	32.2548	-115.2665	12.25
10	04	06	23	14	54.55	32.3162	-115.3069	04.11
10	04	06	23	25	56.15	32.3300	-115.3959	06.42
10	04	06	23	29	07.53	32.4025	-115.4650	06.55
10	04	06	23	35	50.85	32.3280	-115.2962	09.01
10	04	06	23	37	21.19	32.2952	-115.3241	04.02
10	04	06	23	41	18.76	32.3239	-115.4059	05.80
10	04	07	00	00	53.64	32.2160	-115.2544	06.43
10	04	07	00	01	22.88	32.1453	-115.1435	18.56
10	04	07	00	02	45.09	32.1456	-115.1719	07.03
10	04	07	00	14	50.19	32.2367	-115.2752	08.55
10	04	07	00	21	17.05	31.8582	-115.5348	26.84
10	04	07	00	33	46.06	32.2341	-115.2856	07.64
10	04	07	00	35	14.06	32.4401	-115.5033	07.40
10	04	07	00	35	33.33	32.2223	-115.2859	07.96
10	04	07	00	45	49.60	32.3009	-115.2873	06.58
10	04	07	00	46	16.21	32.3120	-115.3212	07.78
10	04	07	00	48	50.72	32.2837	-115.3251	10.46
10	04	07	00	58	33.34	32.4207	-115.4760	11.19
10	04	07	01	06	41.87	32.4363	-115.5285	07.82
10	04	07	01	08	04.79	32.3074	-115.3047	10.61
10	04	07	01	10	59.09	32.2534	-115.2873	10.28
10	04	07	01	15	03.79	32.3442	-115.3916	04.98
10	04	07	01	17	11.90	32.3104	-115.3629	09.50
10	04	07	01	20	38.04	32.2200	-115.2473	05.65
10	04	07	01	22	15.82	32.5490	-115.6619	14.16
10	04	07	01	27	31.12	32.2323	-115.2663	09.19
10	04	07	01	28	45.09	32.2570	-115.2929	11.41
10	04	07	01	28	59.07	32.3127	-115.2949	08.81
10	04	07	01	37	34.34	32.3089	-115.3791	06.67
10	04	07	01	42	47.54	32.4105	-115.4266	12.66
10	04	07	01	43	14.08	32.4312	-115.5322	04.04
10	04	07	01	43	50.20	32.1628	-115.1929	06.16
10	04	07	01	44	31.85	32.1625	-115.1946	05.71
10	04	07	02	30	45.81	32.6105	-115.7574	06.48
10	04	07	02	50	56.17	32.2853	-115.3415	09.53
10	04	07	02	55	26.60	32.2195	-115.2439	09.11
10	04	07	02	57	20.73	32.3106	-115.3199	13.09
10	04	07	03	05	37.02	32.3386	-115.4071	05.94
10	04	07	03	09	51.28	32.1905	-115.2263	05.85
10	04	07	03	29	05.05	32.2124	-115.2300	09.11
10	04	07	03	31	25.81	32.2093	-115.2630	05.92
10	04	07	03	31	55.07	32.2757	-115.2738	09.85
10	04	07	03	36	16.25	32.1757	-115.2229	08.48
10	04	07	03	37	45.07	32.6188	-115.7077	03.47
10	04	07	03	39	50.85	32.3215	-115.3753	10.19
10	04	07	03	40	49.23	32.1475	-115.2110	08.18
10	04	07	03	46	09.41	32.4382	-115.5264	13.66
10	04	07	03	58	21.61	32.2422	-115.2894	08.92
10	04	07	04	02	50.74	32.3042	-115.3061	09.71
10	04	07	04	16	11.65	32.2382	-115.2819	08.90
10	04	07	04	19	02.49	32.2897	-115.3172	09.13
10	04	07	04	19	44.02	32.2256	-115.2608	11.39
10	04	07	04	21	11.29	32.4100	-115.5100	07.61
10	04	07	04	25	42.69	31.7332	-115.1356	11.65
10	04	07	04	31	22.21	32.2214	-115.2396	07.80
10	04	07	04	47	04.61	32.2555	-115.3212	08.09
10	04	07	05	03	04.27	32.2532	-115.2646	08.74
10	04	07	05	06	11.08	32.1638	-115.2154	08.59
10	04	07	05	14	15.65	32.2636	-115.3150	09.24
10	04	07	05	17	16.08	32.1701	-115.2053	03.66
10	04	07	05	19	31.08	32.3226	-115.3178	05.24
10	04	07	05	20	17.40	32.3250	-115.3979	04.39
10	04	07	05	21	25.13	32.6768	-115.8451	01.13
10	04	07	05	25	30.68	32.6788	-115.8397	00.75
10	04	07	05	28	16.16	32.6745	-115.8472	01.90
10	04	07	05	33	30.65	32.1548	-115.2183	07.46
10	04	07	05	35	18.95	31.8825	-115.0893	00.01
10	04	07	05	39	06.95	32.6821	-115.8489	01.98
10	04	07	05	43	30.82	32.1765	-115.2155	07.89
10	04	07	05	47	06.61	32.3572	-115.3878	11.20
10	04	07	06	04	31.82	32.4360	-115.5261	09.19
10	04	07	06	06	14.77	32.5435	-115.6365	09.52
10	04	07	06	06	31.21	32.5446	-115.6491	12.06
10	04	07	06	10	21.94	32.6743	-115.8087	01.15
10	04	07	06	13	37.86	32.2253	-115.2292	10.19
10	04	07	06	16	10.77	32.2364	-115.2729	09.21
10	04	07	06	30	33.72	32.4256	-115.5275	06.61
10	04	07	06	31	12.06	32.2683	-115.3312	06.84
10	04	07	06	34	55.59	32.1929	-115.2384	03.98
10	04	07	06	36	26.47	32.0284	-115.0658	08.08
10	04	07	06	36	26.53	32.0274	-115.0872	08.32
10	04	07	06	37	58.55	32.0943	-115.1466	09.39
10	04	07	06	45	19.74	32.2388	-115.2859	07.12
10	04	07	06	51	43.16	32.2413	-115.3183	06.10
10	04	07	06	52	16.23	32.4422	-115.5269	08.79
10	04	07	06	53	16.25	32.1379	-115.2017	07.50
10	04	07	06	56	52.71	32.3110	-115.2792	05.98
10	04	07	07	01	47.09	32.1429	-115.1839	07.61
10	04	07	07	09	59.48	32.2167	-115.2613	09.02
10	04	07	07	15	29.61	32.2136	-115.2291	03.65
10	04	07	07	15	46.03	31.9547	-115.0476	01.14
10	04	07	07	22	52.34	32.1597	-115.2146	08.66
10	04	07	07	27	51.76	32.1240	-115.1525	04.88
10	04	07	07	29	47.46	32.5142	-115.6081	09.20
10	04	07	07	33	56.36	32.6730	-115.8385	00.73
10	04	07	07	36	22.60	32.2477	-115.2982	08.33
10	04	07	07	39	18.27	32.2119	-115.2266	08.71
10	04	07	07	41	10.50	32.1966	-115.2669	07.17
10	04	07	07	42	20.95	32.6137	-115.7139	03.56
10	04	07	07	44	15.96	32.1995	-115.2642	07.00
10	04	07	07	48	41.18	32.1759	-115.2055	06.52
10	04	07	07	49	56.11	32.2043	-115.2498	06.71
10	04	07	07	54	21.85	32.5761	-115.7157	00.55
10	04	07	07	59	49.49	32.3043	-115.3270	10.53
10	04	07	08	16	35.18	32.3649	-115.4023	11.89
10	04	07	08	19	20.09	32.2708	-115.3309	07.17
10	04	07	08	24	41.48	32.2483	-115.2835	11.23
10	04	07	08	37	30.11	32.2135	-115.2469	09.32
10	04	07	08	41	05.75	32.2446	-115.2884	06.54
10	04	07	08	46	44.79	32.3163	-115.3164	05.92
10	04	07	08	47	47.00	32.3125	-115.3214	07.62
10	04	07	08	49	32.63	32.3030	-115.3143	08.73
10	04	07	09	00	13.27	32.3351	-115.3212	05.45
10	04	07	09	01	42.37	32.2540	-115.2887	09.06
10	04	07	09	10	55.45	32.2138	-115.2614	06.11
10	04	07	09	14	29.63	32.0805	-115.1317	04.89
10	04	07	09	19	48.36	32.2447	-115.2950	08.78
10	04	07	09	21	46.81	32.3431	-115.4048	06.45
10	04	07	09	27	35.40	32.6703	-115.8288	00.06
10	04	07	09	30	38.59	32.0050	-115.0565	04.77
10	04	07	09	32	51.71	32.2060	-115.2428	10.55
10	04	07	09	46	32.00	32.2407	-115.2919	08.38
10	04	07	09	52	03.04	32.2512	-115.3096	07.83
10	04	07	10	04	08.42	32.6118	-115.7624	05.82
10	04	07	10	14	50.65	32.1692	-115.2242	08.34
10	04	07	10	35	30.52	32.2646	-115.3250	08.29
10	04	07	10	47	38.05	32.3116	-115.3252	07.05
10	04	07	10	51	51.17	32.3418	-115.3642	11.99
10	04	07	10	52	17.95	32.2292	-115.2699	08.24
10	04	07	10	55	06.77	32.1844	-115.2260	07.11
10	04	07	11	00	39.18	32.5708	-115.7194	00.00
10	04	07	11	01	39.83	32.5704	-115.7218	00.00
10	04	07	11	04	12.71	32.3295	-115.4017	03.91
10	04	07	11	30	46.46	32.2131	-115.2559	06.68
10	04	07	11	37	18.40	32.1637	-115.2196	04.81
10	04	07	12	15	46.00	32.2904	-115.3278	08.26
10	04	07	12	18	37.23	32.3135	-115.3363	06.99
10	04	07	12	23	15.88	32.3303	-115.3241	07.21
10	04	07	12	36	04.39	32.2311	-115.2648	05.46
10	04	07	12	43	01.77	32.2673	-115.3184	10.46
10	04	07	12	43	01.80	32.2731	-115.3243	09.59
10	04	07	12	54	22.83	32.5585	-115.7443	00.78
10	04	07	13	04	10.80	32.3259	-115.3180	08.54
10	04	07	13	07	27.45	32.2444	-115.3079	08.49
10	04	07	13	08	44.61	32.2595	-115.3208	08.01
10	04	07	13	11	54.60	32.1619	-115.2031	06.34
10	04	07	13	12	38.57	32.1976	-115.2309	09.92
10	04	07	13	18	07.33	32.2225	-115.2472	10.91
10	04	07	13	30	36.47	32.2455	-115.2911	09.57
10	04	07	13	31	56.28	32.5155	-115.6058	13.16
10	04	07	13	33	07.28	31.9159	-115.0752	00.00
10	04	07	13	46	26.53	32.2784	-115.3139	09.12
10	04	07	13	49	26.14	32.3168	-115.3385	10.83
10	04	07	13	51	23.64	32.2406	-115.2891	09.44
10	04	07	13	55	12.32	32.3280	-115.3321	05.69
10	04	07	14	01	42.69	32.2302	-115.2742	10.32
10	04	07	14	04	31.62	32.2968	-115.3412	11.29
10	04	07	14	12	31.96	32.2767	-115.3049	08.42
10	04	07	14	50	01.89	32.2745	-115.3193	06.73
10	04	07	15	11	40.51	32.3042	-115.3029	08.18
10	04	07	15	19	14.84	32.4447	-115.5125	10.67
10	04	07	15	28	36.14	32.2983	-115.3202	08.51
10	04	07	15	30	23.78	32.2983	-115.3304	07.76
10	04	07	15	31	06.06	32.2384	-115.2673	07.91
10	04	07	15	32	36.19	32.3456	-115.4271	08.17
10	04	07	15	36	40.62	32.0714	-115.1143	06.32
10	04	07	15	37	43.20	32.1047	-115.1755	04.46
10	04	07	15	39	06.55	31.9173	-115.1107	00.00
10	04	07	15	47	04.08	32.2760	-115.3041	08.54
10	04	07	15	52	48.78	32.2361	-115.2934	08.63
10	04	07	16	02	41.06	32.2375	-115.2815	09.57
10	04	07	16	03	53.77	32.2699	-115.3226	10.27
10	04	07	16	22	34.55	32.2930	-115.3556	08.16
10	04	07	16	38	36.39	32.5922	-115.7263	04.32
10	04	07	16	51	07.39	32.1293	-115.1824	07.38
10	04	07	17	02	43.27	32.5155	-115.5851	09.05
10	04	07	17	15	07.28	32.3005	-115.3557	08.51
10	04	07	17	26	22.85	32.2956	-115.3203	10.91
10	04	07	17	45	50.32	32.0906	-115.1226	05.67
10	04	07	17	49	43.35	32.2134	-115.2479	07.71
10	04	07	17	51	03.03	32.1838	-115.2433	05.55
10	04	07	18	27	30.04	32.2480	-115.2830	10.26
10	04	07	18	45	39.29	32.6160	-115.7601	06.38
10	04	07	18	57	03.16	32.3797	-115.4340	09.90
10	04	07	19	29	35.41	32.4597	-115.5492	19.53
10	04	07	19	40	19.60	32.2030	-115.2595	07.00
10	04	07	19	44	10.41	32.6704	-115.7613	03.84
10	04	07	19	45	19.13	32.1235	-115.1643	07.65
10	04	07	19	56	40.17	32.3138	-115.3490	10.92
10	04	07	20	11	09.71	32.6412	-115.7126	00.08
10	04	07	20	12	52.35	32.3267	-115.3787	09.35
10	04	07	20	14	56.70	32.4169	-115.5035	10.76
10	04	07	20	33	29.00	32.2918	-115.2151	07.03
10	04	07	20	37	36.37	32.2510	-115.3077	08.49
10	04	07	20	46	45.79	32.1569	-115.2143	04.24
10	04	07	20	55	42.43	32.2088	-115.2530	03.56
10	04	07	21	00	43.64	32.2329	-115.2829	08.77
10	04	07	21	17	54.71	32.2184	-115.2588	07.23
10	04	07	21	19	18.40	32.1987	-115.2525	06.61
10	04	07	21	21	51.30	32.6056	-115.7104	01.95
10	04	07	21	40	32.38	32.2348	-115.2572	09.94
10	04	07	21	41	15.78	32.2739	-115.3334	09.52
10	04	07	21	51	05.58	32.1478	-115.1943	08.18
10	04	07	22	05	01.26	32.2332	-115.2768	07.70
10	04	07	22	05	17.77	32.2105	-115.2459	05.41
10	04	07	22	11	40.56	32.2668	-115.3315	08.71
10	04	07	22	18	11.65	32.5844	-115.6854	10.76
10	04	07	22	24	49.84	32.5073	-115.5824	07.35
10	04	07	22	30	06.83	32.2812	-115.3371	09.89
10	04	07	22	34	20.42	32.2979	-115.3559	08.33
10	04	07	22	34	38.82	32.2970	-115.3545	08.28
10	04	07	22	37	52.06	32.3315	-115.3178	07.44
10	04	07	22	46	09.84	32.3048	-115.3601	10.16
10	04	07	22	47	14.46	32.4377	-115.5189	09.56
10	04	07	22	50	00.05	32.1601	-115.2229	08.24
10	04	07	22	53	46.95	32.2688	-115.3140	07.88
10	04	07	23	06	30.48	32.3323	-115.3450	08.02
10	04	07	23	09	01.72	32.3750	-115.4013	04.99
10	04	07	23	09	28.48	32.3163	-115.3990	05.68
10	04	07	23	15	01.03	32.2740	-115.3375	07.40
10	04	07	23	21	36.75	32.2073	-115.2776	06.30
10	04	07	23	49	43.46	32.4267	-115.5206	08.77
10	04	07	23	56	55.03	32.2281	-115.2314	10.09
10	04	07	23	58	58.53	31.9072	-115.1032	00.00
10	04	08	00	01	28.57	32.2886	-115.3327	06.96
10	04	08	00	25	37.30	32.2446	-115.2446	10.66
10	04	08	00	36	02.32	32.5679	-115.7188	00.00
10	04	08	00	48	40.58	32.2225	-115.2729	09.30
10	04	08	00	57	01.28	32.0834	-115.1096	02.95
10	04	08	01	11	04.38	32.2454	-115.2516	10.10
10	04	08	15	44	58.28	32.6137	-115.7529	06.87
10	04	08	16	44	24.29	32.2220	-115.2462	05.96
10	04	09	05	32	13.99	32.2235	-115.2836	08.91
10	04	09	23	05	40.08	32.2101	-115.2361	04.50
10	04	10	09	12	27.31	32.6689	-115.7497	07.73
10	04	11	19	13	47.88	32.0692	-115.0591	03.74
10	04	19	04	26	07.72	32.6797	-115.8230	05.34
10	04	22	14	22	02.56	32.6544	-115.7733	07.03
10	04	22	17	12	11.94	32.6537	-115.7759	06.28
10	05	04	11	26	30.89	32.2874	-115.2741	10.51
10	05	08	18	33	09.88	32.6703	-115.7725	03.17

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