U.S. DEPARTMENT OF THE INTERIOR NO. 12-11-EXP GEOLOGICAL SURVEY FEB 15, 2012 ROUTINE MINING SEISMICITY IN THE UNITED STATES DECEMBER 2011 ORIGIN TIME GEOGRAPHIC DEPTH MAGNITUDE Q SD GAP NO. F-E REGION, CONTRIBUTED MAGNITUDES AND COMMENTS UTC COORDINATES GS STA DAY HR MN SEC LAT LONG mb MS USED 02 19 08 12.9 43.769 N 105.233 W 0 G A 1.1 114 26 WYOMING. ML 3.4 (GS). 62 km (38 miles) SSE of Gillette. 02 23 05 26.5 44.321 N 105.226 W 0 G A 1.4 80 17 WYOMING. ML 2.8 (GS). 22 km (14 miles) E of Gillette. ML 2.8 (GS). 03 21 08 10.9 43.708 N 105.376 W 0 G A 1.1 147 10 WYOMING. ML 2.9 (GS). 66 km (41 miles) S of Gillette. 04 21 07 04.2 43.716 N 105.236 W 0 G A 1.1 51 64 WYOMING. ML 3.5 (GS). 69 km (43 miles) SSE of Gillette. 08 20 06 18.4 43.617 N 105.169 W 0 G A 1.0 79 16 WYOMING. ML 3.0 (GS). 80 km (49 miles) SSE of Gillette. 08 21 49 42.5 41.845 N 108.551 W 0 G A 1.4 70 18 WYOMING. ML 2.5 (GS). 61 km (38 miles) ENE of Rock Springs. 08 23 01 51.9 40.543 N 109.292 W 0 G A 1.2 137 12 UTAH. ML 2.6 (GS). 22 km (14 miles) ENE of Vernal. 09 21 03 40.7 43.676 N 105.241 W 0 G A 1.0 51 20 WYOMING. ML 3.2 (GS). 70 km (43 miles) SSE of Gillette. 10 19 34 31.4 43.803 N 105.274 W 0 G A 0.9 47 34 WYOMING. ML 3.1 (GS). 57 km (36 miles) SSE of Gillette. 12 20 00 33.6 43.204 N 105.766 W 0 G A 1.1 89 39 WYOMING. mbLg 2.6 (GS). 48 km (30 miles) ESE of Midwest. 12 20 11 04.5 43.784 N 105.191 W 0 G A 1.0 45 48 WYOMING. mbLg 2.8 (GS). 61 km (38 miles) SSE of Gillette. 14 17 31 15.6 43.507 N 105.351 W 0 G A 1.3 69 53 WYOMING. mbLg 2.8 (GS). 76 km (47 miles) E of Midwest. 15 20 39 41.7* 44.372 N 104.997 W 0 G B 2.0 76 33 WYOMING. mbLg 3.0 (GS). 41 km (26 miles) ENE of Gillette. 15 22 04 21.4* 41.521 N 109.078 W 0 G B 1.3 95 9 WYOMING. ML 2.6 (GS). 13 km (8 miles) SE of Rock Springs. 19 19 14 31.4 43.822 N 105.207 W 7 A 0.8 69 51 WYOMING. ML 3.4 (GS). 57 km (36 miles) SSE of Gillette. 19 20 27 35.5 43.586 N 105.194 W 0 G A 0.9 80 38 WYOMING. mbLg 2.8 (GS). ML 3.3 (GS). 82 km (51 miles) SSE of Gillette. 20 22 49 03.5* 45.945 N 107.166 W 0 G B 0.4 87 9 EASTERN MONTANA. mbLg 2.7 (GS). 39 km (24 miles) S of Hysham. 21 19 03 00.3 43.692 N 105.216 W 0 G A 1.0 40 64 WYOMING. ML 3.3 (GS). 69 km (43 miles) SSE of Gillette. 21 19 08 30.2 43.805 N 105.151 W 0 G A 0.8 71 42 WYOMING. ML 3.6 (GS). 62 km (38 miles) SSE of Gillette. 21 21 06 27.6 44.466 N 105.461 W 0 G A 0.8 121 12 WYOMING. mbLg 2.7 (GS). 20 km (12 miles) N of Gillette. 21 22 57 23.2* 43.759 N 105.350 W 0 G B 1.2 131 7 WYOMING. mbLg 2.3 (GS). 60 km (37 miles) SSE of Gillette. 22 21 58 31.4? 45.78 N 106.53 W 0 G C 1.8 223 7 EASTERN MONTANA. ML 2.7 (GS). 13 km (8 miles) SSE of Colstrip. 22 23 14 36.1* 40.697 N 109.428 W 0 G B 0.9 108 8 UTAH. ML 3.0 (GS). 28 km (17 miles) NNE of Vernal. 25 19 08 36.9 43.729 N 105.241 W 0 G A 1.4 140 17 WYOMING. mbLg 2.7 (GS). 66 km (41 miles) SSE of Gillette. 28 21 07 32.0 43.799 N 105.314 W 0 G A 0.8 88 10 WYOMING. mbLg 2.8 (GS). 55 km (34 miles) SSE of Gillette. 28 22 07 41.5* 44.140 N 105.415 W 0 G B 0.7 102 8 WYOMING. mbLg 2.7 (GS). 18 km (11 miles) SSE of Gillette. 29 21 03 31.2* 45.326 N 107.057 W 0 G B 1.4 178 6 EASTERN MONTANA. ML 2.5 (GS). 59 km (37 miles) N of Sheridan. 29 21 40 17.9* 43.956 N 105.110 W 0 G B 0.9 134 8 WYOMING. ML 3.2 (GS). 49 km (31 miles) SE of Gillette. 30 19 51 18.3 45.155 N 106.768 W 0 G A 1.4 65 34 EASTERN MONTANA. ML 3.0 (GS). 42 km (26 miles) NNE of Sheridan.