Monitoring and Research

Seismic Events Within 3 km of Collapse in Crandall Canyon Mine

Updated 10/02/2007 17:00 UTC

seismap

Seismic Events Within 3 km of Collapse in Crandall Canyon Mine
Data Explanation

Lat. N

Long. W

Date

Time (UTC)

hh:mm:ss.s

Magnitude

Depth (km)

MC

ML

39º 26.71' 111º 12.41 10/02/2007 17:37:45.41 1.2 --- 2.03
39º 27.24' 111º 13.46' 10/02/2007 07:40:47.98 1.4 --- 2.35
39º 27.90' 111º 13.00' 9/30/2007 19:23:08.76 2.0 1.5 0.66
39º 27.71' 111º 12.83' 9/30/2007 09:09:49.48 1.9 1.4 0.32
39º 27.98' 111º 13.25' 9/21/2007 07:20:05.91 1.1 --- 0.10
39º 27.42' 111º 11.77' 9/20/2007 02:47:08.93 1.2 --- 0.06
39º27.86' 111º 12.62' 9/18/2007 04:43:25.92 1.6 --- 0.04
39º 26.99' 111º 12.00' 9/15/2007 00:06:55.60 1.3 --- 0.05
39º 27.88' 111º 12.72' 8/27/2007 18:27:02.76 1.3 --- 0.03
39º 27.35' 111º 11.99' 8/27/2007 17:25:29.33 0.8 --- 0.35
39º 27.74' 111º 13.72' 8/26/2007 09:14:19.14 1.1 --- 0.01
39º 27.85' 111º 13.73' 8/25/2007 21:40:53.47 1.3 --- 0.00
39º 27.19' 111º 11.83' 8/25/2007 21:00:31.15 0.9 --- 0.17
39º 27.82' 111º 13.52' 8/25/2007 18:52:33.46 2.1 1.4 0.00
39º 27.99' 111º 12.81' 8/25/2007 14:27:46.09 1.3 --- 0.41
39º 27.97' 111º 12.37' 8/24/2007 19:10:17.83 1.3 --- 0.32
39º 27.88' 111º 13.4 0' 8/23/2007 22:14:53.67 2.0 1.1 0.06
39º 28.12' 111º 13.49' 8/23/2007 21:55:56.90 1.2 --- 0.02
39º 27.97' 111º 13.13' 8/23/2007 02:32:27.97 1.6 --- 0.44
39º 27.86' 111º 12.99' 8/21/2007 14:53:20.88 1.1 --- 0.37
39º 27.77' 111º 12.66' 8/19/2007 07:48:13.22 1.3 --- 0.32
39º 27.86' 111º 13.03' 8/18/2007 17:38:02.06 1.2 --- 0.69
39º 28.02' 111º 12.92' 8/17/2007 12:12:33.00 0.9 --- 0.59
39º 27.88' 111º 12.45' 8/17/2007 07:12:28.73 1.2 --- 0.27
39º 27.59' 111º 12.92' 8/17/2007 00:38:56.96 1.9 1.6 0.28
39º 27.76' 111º 12.82' 8/16/2007 16:04:01.19 1.5 --- 0.03
39º 27.87' 111º 12.41' 8/16/2007 06:40:03.79 1.3 --- 0.32
39 27.82' 111 12.74' 8/15/2007 08:26:59.13 1.2 --- 0.16
39º 27.94' 111º 13.47 ' 8/15/2007 00:23:36.50 1.0 --- 0.38
39 27.97' 111 13.12' 8/14/2007 01:40:53.49 1.5 0.9 0.66
39 27.94' 111 13.18' 8/14/2007 00:12:20.51 1.4 0.7 0.48
39 27.72' 111 13.60' 8/13/2007 23:00:06.93 2.2 1.7 0.39
39 27.78' 111 13.43' 8/13/2007 17:40:59.80 1.7 --- 0.46
39º 27.71' 111º 13.31' 8/7/2007 21:42:51.06 2.1 1.7 7.66
39 28.25' 111 13.31' 8/7/2007 17:05:56.92 1.0 --- 2.42
39 27.79' 111 13.23' 8/7/2007 08:43:47.30 1.6 --- 8.9
39 27.71' 111 13.80' 8/7/2007 07:13:05.71 2.8 2.2 3.92
39 27.91' 111 13.42' 8/7/2007 03:44:18.35 1.9 1.5 7.48
39 27.80' 111 13.53' 8/7/2007 02:14:24.02 1.7 1.2 6.75
39 28.08' 111 13.76' 8/7/2007 02:05:04.09 2.6 2.1 0.02
39 27.53' 111 14.25' 8/6/2007 23:36:01.37 1.7 --- 3.77
39 27.85' 111 13.60' 8/6/2007 23:02:26.06 2.5 1.9 5.92
39 28.23' 111 13.70' 8/6/2007 10:49:09.08 0.8 --- 5.07
39 27.69' 111 12.51' 8/6/2007 10:48:16.73 1.2 --- 4.2
39 27.64' 111 13.96' 8/6/2007 10:47:25.51 2.1 1.6 7.19
39 27.92' 111 14.19' 8/6/2007 08:48:40.39 4.5 3.9 1.61
39 27.72' 111 14.27' 8/6/2007 01:44:48.81 2.2 1.8 6.58
39 27.84' 111 13.67' 8/5/2007 11:39:33.00 1.6 --- 7.03
39 27.65' 111 13.92' 8/3/2007 10:39:17.92 2.0 1.5 6.24
39 28.00' 111 13.57' 7/30/2007 08:51:52.08 1.4 --- 3.37
39 28.32' 111 12.76' 7/25/2007 02:17:21.84 1.8 0.8 6.65
39 27.88' 111 13.67' 7/24/2007 16:46:36.54 2.6 1.9 12.48
39 27.57' 111 13.33' 7/21/2007 10:36:09.88 1.6 --- 6.18
39 28.27' 111 12.38' 7/20/2007 01:30:39.14 0.7 --- 10.8
39 28.16' 111 12.82' 6/5/2007 09:18:59.13 1.3 --- 6.92
39º 27.15' 111º 12.47' 6/4/2007 22:11:41.44 1.0 --- 2.96
39 27.47' 111 13.86' 5/21/2007 20:14:33.94 0.8 --- 7.28
39 27.63' 111 12.53' 4/6/2007 09:01:50.39 1.6 --- 4.01
39 27.30' 111 13.60' 3/14/2007 01:02:16.87 1.6 --- 2.21
39 27.90' 111 13.90' 3/11/2007 21:57:34.41 1.6 --- 2.95
39 27.78' 111 13.61' 3/11/2007 16:43:24.67 1.6 --- 5.16
39 28.25' 111 13.08' 3/11/2007 10:43:11.84 1.5 --- 2.77
39 28.60' 111 13.44' 3/11/2007 01:45:37.04 1.6 --- 2.6
39 27.80' 111 13.50' 3/11/2007 00:22:34.56 2.3 1.8 2.95
39 28.06' 111 13.69' 3/10/2007 15:09:58.83 1.9 1.7 2.57
39 28.02' 111 13.33' 3/10/2007 03:26:51.00 1.7 1.3 3.65
39 28.01' 111 13.61' 3/7/2007 15:52:36.95 1.6 --- 1.38
39 27.73' 111 13.71' 3/7/2007 08:53:27.16 1.5 --- 7.91
39 28.45' 111 13.34' 3/5/2007 22:13:12.77 1.6 --- 4.49
39 28.15' 111 13.56' 3/3/2007 20:03:15.31 1.6 --- 2.3
39 28.13' 111 13.89' 3/2/2007 23:58:11.60 1.6 --- 6.9
39 28.05' 111 13.18' 2/28/2007 14:33:25.91 1.6 --- 3.15
39 28.56' 111 12.93' 2/27/2007 16:27:59.97 1.2 --- 3.17
39 27.94' 111 12.07' 1/2/2007 20:49:01.55 1.0 --- 3.92

Data Explanation

The seismic events in this table are for the year 2007 only. This table and map will be updated periodically. Data are subject to revision as velocity models and location techniques are refined and as data are added from temporary seismic stations with onsite recorders. Locations on and after August 13 were computed using data from temporary seismic stations above and near the Crandall Canyon mine and with a local velocity model. These locations are likely to be more accurate in absolute location than those for earlier events.

Estimates of magnitude include the computed Richter local magnitude (ML), when measurable, and/or coda magnitude (MC), an empirical estimate of ML calculated from signal durations. For mining-induced earthquakes, MC tends to be systematically larger than ML because of the effect of shallow surface waves. ML is our preferred size estimate and is plotted as the size symbol on the map when available.

In the absence of a closest recording station comparable in distance to the depth of a seismic event, focal-depth resolution is poor, and the computed depths in this table for seismic events occurring before August 13 have large uncertainty. The closest stations at the time of the main seismic event on August 6 were situated 18 km or more away.