Bulletin: April 1999
U.S. DEPARTMENT OF THE INTERIOR NO. 4-99-EXP
GEOLOGICAL SURVEY JUN 26, 1999
PROBABLE MINING EXPLOSIONS IN THE UNITED STATES
APRIL 1999
ORIGIN TIME GEOGRAPHIC DEPTH MAGNITUDE SD NO. REGION, CONTRIBUTED MAGNITUDES AND COMMENTS
UTC COORDINATES GS STA
DAY HR MN SEC LAT LONG MB Msz USED
02 22 59 02.9 40.233 N 107.778 W 0 G 0.8 14 COLORADO. ML 3.1 (GS). 25 miles (40 km) SSW of Craig,
Colorado.
06 22 12 52.7 40.315 N 107.805 W 0 G 1.3 10 COLORADO. ML 2.8 (GS). 20 miles (30 km) SW of Craig,
Colorado.
06 22 21 02.0 40.369 N 106.893 W 0 G 1.3 9 COLORADO. ML 2.8 (GS). 10 miles (20 km) SSW of Steamboat
Springs, Colorado.
08 21 04 32.4 40.454 N 106.917 W 0 G 0.7 10 COLORADO. ML 2.4 (GS). Near Steamboat Springs, Colorado.
08 23 01 26.8 41.829 N 108.722 W 0 G 1.0 16 WYOMING. ML 2.5 (GS). 30 miles (50 km) ENE of Rock Springs,
Wyoming.
09 18 15 49.3* 43.660 N 105.168 W 0 G 1.1 7 WYOMING. ML 2.8 (GS). 45 miles (80 km) SSE of Gillette,
Wyoming.
13 20 20 49.4* 44.179 N 105.379 W 0 G 1.0 10 WYOMING. ML 3.2 (GS). 10 miles (20 km) SE of Gillette,
Wyoming.
13 23 07 47.8* 43.598 N 105.107 W 0 G 1.3 9 WYOMING. ML 3.0 (GS). 50 miles (80 km) WSW of Newcastle,
Wyoming.
14 20 14 03.6 40.468 N 106.915 W 0 G 0.8 14 COLORADO. ML 2.6 (GS). Near Steamboat Springs, Colorado.
16 19 27 29.5 40.530 N 112.223 W 0 G 1.3 14 UTAH. ML 2.5 (GS). Near Tooele, Utah.
16 22 10 12.7 41.792 N 108.677 W 0 G 1.2 13 WYOMING. ML 2.5 (GS). 30 miles (50 km) ENE of Rock Springs,
Wyoming.
18 00 30 02.5 40.393 N 106.953 W 0 G 0.7 13 COLORADO. ML 2.3 (GS). 10 miles (10 km) SW of Steamboat
Springs, Colorado.
26 15 41 18.8 43.613 N 105.191 W 0 G 1.0 11 WYOMING. ML 3.0 (GS). 50 miles (80 km) SSE of Gillette,
Wyoming.
27 21 10 16.2* 44.263 N 105.258 W 0 G 1.3 6 WYOMING. ML 2.6 (GS). 10 miles (20 km) E of Gillette,
Wyoming.
28 19 06 14.1* 43.719 N 105.186 W 0 G 1.4 7 WYOMING. ML 3.1 (GS). 40 miles (70 km) SSE of Gillette,
Wyoming.
28 23 04 38.3* 43.559 N 105.087 W 0 G 1.1 7 WYOMING. ML 2.6 (GS). 50 miles (80 km) WSW of Newcastle,
Wyoming.
29 16 12 41.6 41.773 N 108.674 W 0 G 1.3 20 WYOMING. ML 2.6 (GS). 30 miles (50 km) ENE of Rock Springs,
Wyoming.
29 21 26 09.0 46.687 N 122.829 W 0 G 0.8 7 WASHINGTON. ML 2.4 (GS). 5 miles (10 km) ESE of Centralia,
Washington.
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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