Seismic Events Within 3 km of Collapse in Crandall Canyon Mine
Seismic Events Within 3 km of Collapse in Crandall Canyon Mine |
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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 |
| 39º 27.82' | 111º 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 |
| 39º 27.97' | 111º 13.12' | 8/14/2007 | 01:40:53.49 | 1.5 | 0.9 | 0.66 |
| 39º 27.94' | 111º 13.18' | 8/14/2007 | 00:12:20.51 | 1.4 | 0.7 | 0.48 |
| 39º 27.72' | 111º 13.60' | 8/13/2007 | 23:00:06.93 | 2.2 | 1.7 | 0.39 |
| 39º 27.78' | 111º 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 |
| 39º 28.25' | 111º 13.31' | 8/7/2007 | 17:05:56.92 | 1.0 | --- | 2.42 |
| 39º 27.79' | 111º 13.23' | 8/7/2007 | 08:43:47.30 | 1.6 | --- | 8.9 |
| 39º 27.71' | 111º 13.80' | 8/7/2007 | 07:13:05.71 | 2.8 | 2.2 | 3.92 |
| 39º 27.91' | 111º 13.42' | 8/7/2007 | 03:44:18.35 | 1.9 | 1.5 | 7.48 |
| 39º 27.80' | 111º 13.53' | 8/7/2007 | 02:14:24.02 | 1.7 | 1.2 | 6.75 |
| 39º 28.08' | 111º 13.76' | 8/7/2007 | 02:05:04.09 | 2.6 | 2.1 | 0.02 |
| 39º 27.53' | 111º 14.25' | 8/6/2007 | 23:36:01.37 | 1.7 | --- | 3.77 |
| 39º 27.85' | 111º 13.60' | 8/6/2007 | 23:02:26.06 | 2.5 | 1.9 | 5.92 |
| 39º 28.23' | 111º 13.70' | 8/6/2007 | 10:49:09.08 | 0.8 | --- | 5.07 |
| 39º 27.69' | 111º 12.51' | 8/6/2007 | 10:48:16.73 | 1.2 | --- | 4.2 |
| 39º 27.64' | 111º 13.96' | 8/6/2007 | 10:47:25.51 | 2.1 | 1.6 | 7.19 |
| 39º 27.92' | 111º 14.19' | 8/6/2007 | 08:48:40.39 | 4.5 | 3.9 | 1.61 |
| 39º 27.72' | 111º 14.27' | 8/6/2007 | 01:44:48.81 | 2.2 | 1.8 | 6.58 |
| 39º 27.84' | 111º 13.67' | 8/5/2007 | 11:39:33.00 | 1.6 | --- | 7.03 |
| 39º 27.65' | 111º 13.92' | 8/3/2007 | 10:39:17.92 | 2.0 | 1.5 | 6.24 |
| 39º 28.00' | 111º 13.57' | 7/30/2007 | 08:51:52.08 | 1.4 | --- | 3.37 |
| 39º 28.32' | 111º 12.76' | 7/25/2007 | 02:17:21.84 | 1.8 | 0.8 | 6.65 |
| 39º 27.88' | 111º 13.67' | 7/24/2007 | 16:46:36.54 | 2.6 | 1.9 | 12.48 |
| 39º 27.57' | 111º 13.33' | 7/21/2007 | 10:36:09.88 | 1.6 | --- | 6.18 |
| 39º 28.27' | 111º 12.38' | 7/20/2007 | 01:30:39.14 | 0.7 | --- | 10.8 |
| 39º 28.16' | 111º 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 |
| 39º 27.47' | 111º 13.86' | 5/21/2007 | 20:14:33.94 | 0.8 | --- | 7.28 |
| 39º 27.63' | 111º 12.53' | 4/6/2007 | 09:01:50.39 | 1.6 | --- | 4.01 |
| 39º 27.30' | 111º 13.60' | 3/14/2007 | 01:02:16.87 | 1.6 | --- | 2.21 |
| 39º 27.90' | 111º 13.90' | 3/11/2007 | 21:57:34.41 | 1.6 | --- | 2.95 |
| 39º 27.78' | 111º 13.61' | 3/11/2007 | 16:43:24.67 | 1.6 | --- | 5.16 |
| 39º 28.25' | 111º 13.08' | 3/11/2007 | 10:43:11.84 | 1.5 | --- | 2.77 |
| 39º 28.60' | 111º 13.44' | 3/11/2007 | 01:45:37.04 | 1.6 | --- | 2.6 |
| 39º 27.80' | 111º 13.50' | 3/11/2007 | 00:22:34.56 | 2.3 | 1.8 | 2.95 |
| 39º 28.06' | 111º 13.69' | 3/10/2007 | 15:09:58.83 | 1.9 | 1.7 | 2.57 |
| 39º 28.02' | 111º 13.33' | 3/10/2007 | 03:26:51.00 | 1.7 | 1.3 | 3.65 |
| 39º 28.01' | 111º 13.61' | 3/7/2007 | 15:52:36.95 | 1.6 | --- | 1.38 |
| 39º 27.73' | 111º 13.71' | 3/7/2007 | 08:53:27.16 | 1.5 | --- | 7.91 |
| 39º 28.45' | 111º 13.34' | 3/5/2007 | 22:13:12.77 | 1.6 | --- | 4.49 |
| 39º 28.15' | 111º 13.56' | 3/3/2007 | 20:03:15.31 | 1.6 | --- | 2.3 |
| 39º 28.13' | 111º 13.89' | 3/2/2007 | 23:58:11.60 | 1.6 | --- | 6.9 |
| 39º 28.05' | 111º 13.18' | 2/28/2007 | 14:33:25.91 | 1.6 | --- | 3.15 |
| 39º 28.56' | 111º 12.93' | 2/27/2007 | 16:27:59.97 | 1.2 | --- | 3.17 |
| 39º 27.94' | 111º 12.07' | 1/2/2007 | 20:49:01.55 | 1.0 | --- | 3.92 |
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.