U.S. DEPARTMENT OF THE INTERIOR NO. 12-08-EXP GEOLOGICAL SURVEY FEB 23, 2009 ROUTINE MINING SEISMICITY IN THE UNITED STATES DECEMBER 2008 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 01 20 06 51.7 43.793 N 105.222 W 0 G A 1.1 51 54 WYOMING. ML 3.4 (GS). 60 km (35 miles) SSE of Gillette. 06 19 11 36.9 43.797 N 105.262 W 0 G A 1.2 50 58 WYOMING. ML 3.3 (GS). 60 km (35 miles) SSE of Gillette. 06 21 07 11.5 43.740 N 105.180 W 0 G A 1.0 74 16 WYOMING. ML 3.0 (GS). 65 km (40 miles) SSE of Gillette. 06 22 00 20.7 43.591 N 105.288 W 0 G A 1.0 50 35 WYOMING. ML 3.2 (GS). 80 km (50 miles) SSE of Gillette. 07 19 12 33.4 43.705 N 105.133 W 0 G A 0.8 52 56 WYOMING. ML 3.4 (GS). 70 km (45 miles) SSE of Gillette. 08 19 07 25.8* 43.461 N 105.082 W 0 G B 3.1 134 35 WYOMING. ML 3.1 (GS). 85 km (50 miles) WSW of Newcastle. 13 22 38 58.9 43.680 N 105.215 W 0 G A 1.3 75 22 WYOMING. ML 2.8 (GS). 70 km (45 miles) SSE of Gillette. 19 18 29 03.0 45.103 N 106.707 W 0 G A 1.2 65 41 EASTERN MONTANA. ML 3.1 (GS). 40 km (25 miles) NNE of Sheridan. 20 18 05 11.1 43.464 N 105.045 W 0 G A 1.3 140 23 WYOMING. ML 3.1 (GS). 80 km (50 miles) WSW of Newcastle. 22 23 24 49.7 44.500 N 105.439 W 0 G A 1.1 98 20 WYOMING. ML 2.8 (GS). 25 km (15 miles) NNE of Gillette. 23 21 28 39.9 43.669 N 105.232 W 0 G A 0.9 120 21 WYOMING. ML 3.0 (GS). 75 km (45 miles) SSE of Gillette. 31 18 01 42.6 43.342 N 105.092 W 0 G A 1.5 52 34 WYOMING. ML 3.4 (GS). 70 km (45 miles) NNE of Douglas.