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.