U.S. DEPARTMENT OF THE INTERIOR NO. 4-11-EXP GEOLOGICAL SURVEY JUL 26, 2011 ROUTINE MINING SEISMICITY IN THE UNITED STATES APRIL 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 03 18 06 52.8 43.694 N 105.360 W 0 G A 1.0 148 17 WYOMING. ML 3.1 (GS). 71 km (44 miles) SSE of Gillette. 07 19 40 58.3? 45.38 N 106.66 W 0 G C 3.3 70 15 EASTERN MONTANA. ML 2.7 (GS). 56 km (35 miles) S of Colstrip. 08 17 59 03.5 43.764 N 105.102 W 0 G A 1.5 47 61 WYOMING. ML 3.3 (GS). 67 km (41 miles) SSE of Gillette. 12 20 06 28.3 43.631 N 105.156 W 0 G A 1.3 29 60 WYOMING. ML 3.5 (GS). 78 km (49 miles) SSE of Gillette. 12 21 04 58.1 43.728 N 105.233 W 0 G A 0.8 73 20 WYOMING. ML 3.3 (GS). 66 km (41 miles) SSE of Gillette. 13 19 39 20.6 43.630 N 105.133 W 0 G A 1.1 102 19 WYOMING. ML 3.0 (GS). 79 km (49 miles) WSW of Newcastle. 16 21 57 44.4 43.993 N 105.296 W 0 G A 1.4 94 16 WYOMING. ML 3.0 (GS). 37 km (23 miles) SSE of Gillette. 17 20 06 07.9 43.816 N 105.373 W 0 G A 1.2 50 17 WYOMING. ML 3.1 (GS). 54 km (33 miles) S of Gillette. 20 00 15 13.8 45.784 N 106.895 W 0 G A 1.3 94 29 EASTERN MONTANA. ML 2.7 (GS). 23 km (15 miles) WSW of Colstrip. 20 19 39 04.7 43.610 N 105.110 W 0 G A 1.3 82 36 WYOMING. ML 3.4 (GS). 78 km (49 miles) WSW of Newcastle. 20 20 49 24.6 45.920 N 106.359 W 0 G A 1.3 82 16 EASTERN MONTANA. ML 2.8 (GS). 21 km (13 miles) E of Colstrip. 22 19 50 20.7 41.891 N 106.348 W 0 G A 1.3 46 32 WYOMING. ML 3.4 (GS). 62 km (38 miles) NE of Saratoga. 27 19 09 23.0 43.629 N 105.352 W 0 G A 1.9 74 19 WYOMING. ML 3.0 (GS). 75 km (46 miles) S of Gillette. 29 18 10 02.4 43.654 N 105.225 W 0 G A 0.9 29 66 WYOMING. ML 3.6 (GS). 73 km (45 miles) SSE of Gillette.