Bulletin: April 2003


U.S. DEPARTMENT OF THE INTERIOR                                                                         NO. 4-03-EXP
GEOLOGICAL SURVEY                                                                                        MAY 14, 2003

                                         ROUTINE MINING SEISMICITY IN THE UNITED STATES

    

                                                            APRIL 2003

    

    

     ORIGIN TIME       GEOGRAPHIC       DEPTH MAGNITUDE  SD  GAP  NO.   F-E REGION, CONTRIBUTED MAGNITUDES AND COMMENTS
         UTC          COORDINATES                GS              STA                                                
   DAY HR MN SEC     LAT       LONG            mb  MS            USED                                                

   15  18 02 46.2* 43.723 N  105.297 W    0 G           1.2  161   11  WYOMING. ML 3.2 (GS). 40 miles (65 km) SSE of Gillette.
   16  19 17 54.1  44.129 N  105.334 W    0 G           0.6  148   16  WYOMING. ML 3.2 (GS). 20 km (15 miles) SSE of Gillette.
   20  17 01 38.9  44.155 N  105.419 W    0 G           0.8  149   25  WYOMING. ML 3.2 (GS).
   21  23 46 41.5  43.555 N  105.390 W    0 G           0.9  121   10  WYOMING. ML 3.0 (GS). 45 miles (75 km) ENE of Midwest, Wyoming.
   25  18 02 53.0  43.857 N  105.360 W    0 G           0.9  129   20  WYOMING. ML 3.1 (GS).

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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