Bulletin: April 2004

U.S. DEPARTMENT OF THE INTERIOR                                                                         NO.  4-04-EXP
GEOLOGICAL SURVEY                                                                                        MAY 28, 2004


                                      ROUTINE MINING SEISMICITY IN THE UNITED STATES
 
                                                         APRIL 2004
 

  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                                                
 
06  18 11 36.8* 43.778 N  105.249 W   0 G           B 0.7  179    7  WYOMING. ML 2.8 (GS). 60 km (40 miles) SSE of Gillette.
09  18 57 45.7  43.767 N  105.328 W   0 G           A 0.9  123   14  WYOMING. ML 3.1 (GS). 60 km (35 miles) SSE of Gillette.
13  18 03 17.2  43.830 N  105.264 W   0 G           A 0.7   94   10  WYOMING. ML 3.5 (GS). 55 km (35 miles) SSE of Gillette.
16  18 07 44.1  43.710 N  105.151 W   0 G           A 1.1  122   12  WYOMING. ML 3.2 (GS). 70 km (45 miles) SSE of Gillette.
18  18 04 04.5  43.646 N  105.226 W   0 G           A 0.7  123   17  WYOMING. ML 3.1 (GS). 75 km (50 miles) SSE of Gillette.
19  18 02 08.4  43.812 N  105.257 W   0 G           A 0.7  113   22  WYOMING. ML 3.2 (GS). 55 km (35 miles) SSE of Gillette.
22  22 20 32.6  41.227 N  117.432 W   0 G           A 1.3   85   11  NEVADA. ML 2.4 (GS). ML 2.4 (GS). 40 km (25 miles) NE
                                                                      of Winnemucca.
23  00 40 07.9  43.728 N  105.178 W   0 G           A 1.0  120   14  WYOMING. ML 3.0 (GS). 70 km (40 miles) SSE of Gillette.
23  21 11 49.7  43.771 N  105.272 W   0 G           A 0.6  123   15  WYOMING. ML 3.5 (GS). 60 km (40 miles) SSE of Gillette.
23  23 07 11.9  43.782 N  105.521 W   0 G           A 1.2  107   16  WYOMING. ML 2.9 (GS). 55 km (35 miles) S of Gillette.
24  18 05 58.1  43.810 N  105.241 W   0 G           A 0.8  112   34  WYOMING. ML 3.5 (GS). 60 km (35 miles) SSE of Gillette.

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.

Routine U.S. Mining Seismicity Home Page | Goal and Scope of the Bulletin | Evidence used in Identifying Routine Mining Seismicity | Explanation of Catalog Listings | Mining Seismicity Source Regions