Bulletin: December 2011
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.
For origin times after September 30, 2002, USGS computations of hypocenters and magnitudes for routine mining events are listed in this publication only for exceptionally large events and for events that are also listed in the Reviewed Event Event Bulletins (REB) of the International Data Center of the United Nations' Comprehensive Nuclear-Test-Ban Treaty Organization.
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