Hi DH. The small quake you’re referring to appears to be in the area where a swarm of quakes has occurred recently (Jan 2004.) This swarm of quakes is known as the Livermore swarm.

The map I have shows a small east/west trending fault in the approximate area, but isn’t named. Take Care…Don in creepy town

catalog=ANSS
start_time=1990/01/01,00:00:00
end_time=2004/12/21,22:34:14
minimum_magnitude=0.1
maximum_magnitude=10
event_type=E
delta=0 km to 02 km from (37.715,-121.817)
Date Time Lat Lon Depth Mag Magt Nst Gap Clo RMS SRC Event ID
----------------------------------------------------------------------------------------------
1999/07/10 22:17:06.33 37.7260 -121.8025 17.86 2.12 Md 56 54 6 0.11 NC 21033551
1999/07/11 05:30:34.37 37.7200 -121.8095 16.17 1.45 Md 30 105 10 0.07 NC 21033630
2000/10/29 01:21:22.35 37.7087 -121.8110 5.04 1.00 Md 5 161 18 0.04 NC 51102621
2001/06/13 11:12:01.76 37.7093 -121.8293 11.84 1.00 Md 7 118 10 0.04 NC 21170082
2003/05/24 18:14:15.04 37.7160 -121.8142 13.11 0.86 Md 9 101 2 0.10 NC 21283434
2004/01/18 13:00:57.56 37.7220 -121.8113 17.12 2.92 Md 67 72 2 0.13 NC 51136823
2004/01/19 00:38:34.89 37.7205 -121.8162 16.58 1.78 Md 38 71 10 0.07 NC 21335284
2004/01/19 04:02:13.05 37.7187 -121.8087 17.86 2.21 Md 48 69 9 0.10 NC 51136855
2004/01/19 05:20:52.93 37.7197 -121.8072 14.91 1.55 Md 31 92 3 0.11 NC 21335341
2004/01/19 22:59:14.72 37.7183 -121.8122 17.48 1.93 Md 28 91 10 0.09 NC 51136888
2004/01/20 05:19:39.35 37.7183 -121.8150 16.76 3.22 ML 66 90 2 0.13 NC 51136906
2004/01/20 05:22:36.57 37.7192 -121.8135 16.98 1.85 Md 23 92 10 0.07 NC 51136907
2004/01/20 05:44:05.50 37.7163 -121.8140 16.40 2.33 Md 55 69 10 0.11 NC 51136909
2004/01/20 06:01:05.86 37.7193 -121.8122 17.79 1.58 Md 20 91 10 0.07 NC 51136911
2004/01/20 06:11:04.27 37.7205 -121.8187 15.67 1.31 Md 13 92 10 0.05 NC 51136912
2004/01/20 06:12:12.16 37.7208 -121.8135 17.01 1.45 Md 15 93 10 0.06 NC 51136913
2004/01/20 06:58:22.34 37.7197 -121.8132 15.74 1.57 Md 32 92 2 0.13 NC 30226865
2004/01/20 12:42:25.14 37.7132 -121.8088 16.93 1.72 Md 27 87 10 0.11 NC 51136927
2004/01/20 22:27:05.63 37.7192 -121.8223 14.07 1.18 Md 8 109 11 0.04 NC 51136946
2004/01/21 05:31:44.15 37.7132 -121.8152 16.74 2.32 Md 57 87 10 0.09 NC 51136958
2004/01/21 06:23:00.83 37.7203 -121.8187 18.64 3.53 ML 112 71 8 0.14 NC 30226981
2004/01/21 06:26:11.70 37.7210 -121.8142 18.61 1.61 Md 11 93 10 0.04 NC 51136963
2004/01/21 06:35:09.98 37.7202 -121.8178 17.91 3.42 ML 74 71 10 0.13 NC 51136964
2004/01/21 07:13:34.65 37.7232 -121.8067 18.07 2.38 Md 52 72 9 0.11 NC 51136967
2004/01/21 07:15:52.49 37.7187 -121.8113 15.29 1.24 Md 8 91 10 0.04 NC 51136968
2004/01/21 07:26:58.80 37.7237 -121.8160 18.81 2.14 Md 62 73 10 0.12 NC 21335958
2004/01/21 07:30:30.38 37.7293 -121.8135 18.43 2.86 Md 66 77 9 0.09 NC 51136970
2004/01/21 07:35:13.14 37.7187 -121.8188 17.17 3.07 ML 69 70 2 0.13 NC 51136971
2004/01/21 07:37:31.48 37.7088 -121.8190 15.33 1.19 Md 6 108 11 0.06 NC 51136972
2004/01/21 07:57:34.60 37.7242 -121.8087 18.13 2.26 Md 50 73 9 0.09 NC 51136974
2004/01/21 08:26:21.99 37.7092 -121.8178 16.23 2.30 Md 50 85 10 0.09 NC 51136975
2004/01/21 10:08:39.06 37.7238 -121.8150 17.32 1.46 Md 16 95 10 0.05 NC 51136978
2004/01/21 15:33:19.04 37.7103 -121.8215 16.24 1.97 Md 48 85 10 0.09 NC 21336062
2004/01/21 22:19:12.40 37.7202 -121.8153 18.60 1.99 Md 52 91 10 0.08 NC 21336151
2004/01/22 01:05:57.96 37.7137 -121.8173 18.36 1.55 Md 16 87 10 0.07 NC 40151980
2004/01/22 12:45:48.98 37.7185 -121.8060 18.14 2.15 Md 47 69 9 0.10 NC 40152013
2004/01/22 20:51:12.57 37.7178 -121.8102 11.95 1.24 Md 9 114 10 0.04 NC 40152035
2004/01/24 12:05:12.41 37.7142 -121.8228 16.48 1.45 Md 25 87 10 0.08 NC 21337174
2004/02/03 14:12:56.14 37.7210 -121.8120 14.26 1.54 Md 23 159 2 0.09 NC 21339904
2004/02/26 13:03:21.34 37.7160 -121.8305 16.52 1.86 Md 10 88 11 0.04 NC 40153841
2004/03/05 23:37:54.14 37.7195 -121.8217 12.75 1.30 Md 7 211 2 0.03 NC 21348039
2004/03/06 12:00:34.06 37.7205 -121.8243 12.55 1.31 Md 16 112 1 0.07 NC 21348185
2004/03/08 01:18:29.55 37.7117 -121.8228 16.47 1.86 Md 57 86 10 0.09 NC 21348565
2004/03/13 10:25:39.01 37.7152 -121.8262 12.00 1.22 Md 13 88 2 0.06 NC 21350148
2004/03/16 09:34:53.79 37.7217 -121.8172 13.17 1.29 Md 13 127 2 0.06 NC 21350847
2004/03/26 00:24:41.43 37.7197 -121.8272 12.14 1.34 Md 10 100 1 0.03 NC 21353422
2004/04/05 07:09:29.39 37.7158 -121.8275 17.69 1.47 Md 14 88 11 0.05 NC 30227341
2004/04/16 10:20:35.10 37.7120 -121.8248 14.01 1.40 Md 12 86 2 0.06 NC 21358385
2004/04/18 04:00:43.06 37.7108 -121.8200 16.32 1.43 Md 27 109 11 0.06 NC 21358749
2004/04/26 19:13:59.72 37.7243 -121.8210 18.92 3.27 ML 102 55 1 0.16 NC 30227453
2004/04/26 19:17:09.74 37.7163 -121.8180 16.23 2.34 Md 49 73 2 0.21 NC 30227454
2004/04/26 19:18:58.66 37.7193 -121.8173 17.50 2.02 Md 49 91 9 0.08 NC 30227455
2004/04/26 19:19:18.85 37.7265 -121.8213 16.67 1.50 Md 38 77 1 0.20 NC 30227456
2004/04/26 19:20:54.04 37.7242 -121.8193 19.23 2.31 Md 62 55 9 0.12 NC 30227457
2004/04/26 19:58:36.42 37.7213 -121.8207 12.26 1.31 Md 9 92 1 0.04 NC 21360317
2004/04/26 20:21:54.47 37.7263 -121.8077 13.30 1.34 Md 16 92 2 0.08 NC 21360320
2004/04/26 22:42:05.25 37.7198 -121.8233 13.10 1.40 Md 14 88 1 0.06 NC 21360361
2004/04/27 00:25:54.20 37.7088 -121.8213 16.30 1.43 Md 11 147 11 0.04 NC 21360398
2004/04/27 04:58:37.81 37.7222 -121.7998 12.80 1.17 Md 11 96 3 0.07 NC 21360467
2004/04/28 10:44:33.66 37.7208 -121.8273 12.81 1.40 Md 15 92 1 0.06 NC 21360787
2004/04/28 20:49:24.95 37.7143 -121.8248 15.52 1.88 Md 37 123 2 0.16 NC 21360894
2004/04/28 21:49:12.50 37.7232 -121.8172 15.62 1.91 Md 49 75 2 0.14 NC 21360898
2004/04/29 04:38:15.12 37.7172 -121.8228 15.44 1.96 Md 44 72 2 0.11 NC 21360932
2004/04/29 04:40:06.11 37.7148 -121.8348 14.18 1.78 Md 30 67 2 0.16 NC 30227554
2004/04/29 17:19:30.92 37.7122 -121.8270 11.82 1.34 Md 8 85 2 0.09 NC 21361010
2004/04/29 19:49:58.87 37.7277 -121.8180 18.78 3.63 ML 88 56 1 0.15 NC 40156432
2004/04/29 20:09:22.18 37.7287 -121.8072 13.22 1.30 Md 7 234 2 0.05 NC 21361038
2004/05/04 13:42:24.13 37.7107 -121.8257 16.83 2.07 Md 46 85 10 0.13 NC 21362281
2004/05/04 18:58:26.74 37.7232 -121.8192 14.48 1.43 Md 17 94 1 0.12 NC 21362370
2004/05/05 17:43:32.07 37.7222 -121.8148 12.25 1.40 Md 6 166 2 0.04 NC 21362536
2004/05/16 09:12:31.78 37.7157 -121.8257 15.51 1.36 Md 8 116 10 0.08 NC 40156961
2004/05/20 02:43:56.99 37.7223 -121.8047 18.69 2.32 Md 45 76 8 0.15 NC 40157066
2004/06/04 08:00:19.36 37.7180 -121.8225 14.13 1.31 Md 13 90 2 0.09 NC 21368757
2004/06/04 08:01:58.71 37.7187 -121.8237 18.22 1.47 Md 17 90 11 0.06 NC 21368758
2004/06/09 16:05:54.85 37.7173 -121.8255 17.69 2.19 Md 57 89 10 0.10 NC 21369852
2004/06/14 04:40:54.98 37.7222 -121.8065 15.25 1.42 Md 10 200 3 0.07 NC 21370593
2004/06/17 06:37:29.02 37.7182 -121.8248 15.27 1.56 Md 6 90 11 0.03 NC 21371194
2004/06/17 09:47:31.44 37.7203 -121.8222 14.47 1.42 Md 10 92 10 0.05 NC 21371212
2004/07/01 00:26:00.73 37.7178 -121.8225 16.90 1.56 Md 16 74 11 0.08 NC 21374508
2004/07/01 00:43:05.96 37.7157 -121.8252 13.84 1.31 Md 8 116 2 0.05 NC 21374515
2004/07/04 04:17:24.35 37.7155 -121.8260 12.54 1.40 Md 9 121 2 0.05 NC 21375429
2004/08/01 06:51:03.70 37.7157 -121.8275 18.32 1.88 Md 41 122 10 0.08 NC 21385332
2004/08/07 08:20:02.67 37.7158 -121.8348 12.17 1.27 Md 7 87 1 0.05 NC 21386708
2004/08/09 23:16:57.94 37.7097 -121.8195 16.59 1.85 Md 37 84 9 0.10 NC 21387326
2004/09/19 00:24:37.35 37.7275 -121.8090 18.13 2.90 Md 75 77 9 0.12 NC 51146419
2004/09/19 00:36:02.51 37.7285 -121.8025 18.79 2.41 Md 57 79 9 0.09 NC 51146432
2004/09/19 00:43:18.23 37.7265 -121.8017 19.41 1.39 Md 10 97 8 0.04 NC 51146436
2004/11/01 09:33:11.40 37.7097 -121.8285 12.69 1.35 Md 15 84 2 0.13 NC 51152393
2004/12/10 17:31:21.58 37.7198 -121.8103 15.30 2.01 Md 54 74 2 0.10 NC 21426465
2004/12/21 15:18:16.18 37.7148 -121.8173 16.41 2.31 Md 47 72 2 0.15 NC 40169852

• Livermore Swarm