Seems pretty aggressive for an Obsidian Butte cluster. Usually they seem to be just as numerous, but smaller in magnitude, or at least tha't how I remember previous Obsidian Butte clusters ....

I also picked up a left ear tone, 15 seconds long, at 15:57 or so, then another smaller one a few minutes later. Not sure it has anything to do with anything ...

2.1 2005/08/31 16:13:11 33.054N 115.702W 3.4 8 km ( 5 mi) WNW of Westmorland, CA
4.1 2005/08/31 16:07:16 33.168N 115.622W 4.8 1 km ( 1 mi) E of Obsidian Butte, CA
2.5 2005/08/31 16:01:19 33.175N 115.610W 3.5 3 km ( 2 mi) ENE of Obsidian Butte, CA
3.1 2005/08/31 15:59:48 33.171N 115.625W 5.5 1 km ( 1 mi) E of Obsidian Butte, CA
2.8 2005/08/31 15:59:01 33.199N 115.606W 2.0 4 km ( 3 mi) NE of Obsidian Butte, CA
3.0 2005/08/31 15:56:25 33.174N 115.614W 6.3 2 km ( 1 mi) E of Obsidian Butte, CA
3.6 2005/08/31 15:54:28 33.167N 115.617W 6.4 2 km ( 1 mi) E of Obsidian Butte, CA
4.4 2005/08/31 15:50:24 33.190N 115.614W 3.1 3 km ( 2 mi) NE of Obsidian Butte, CA
4.4 2005/08/31 15:47:44 33.155N 115.606W 0.0 3 km ( 2 mi) ESE of Obsidian Butte, CA
3.4 2005/08/31 15:45:49 33.181N 115.613W 4.5 3 km ( 2 mi) ENE of Obsidian Butte, CA
2.4 2005/08/31 15:41:35 33.170N 115.618W 5.7 2 km ( 1 mi) E of Obsidian Butte, CA
2.2 2005/08/31 15:31:51 33.175N 115.616W 5.5 2 km ( 1 mi) ENE of Obsidian Butte, CA
1.9 2005/08/31 15:23:04 33.146N 115.649W 2.1 3 km ( 2 mi) SSW of Obsidian Butte, CA
2.2 2005/08/31 15:20:33 33.177N 115.606W 4.6 3 km ( 2 mi) ENE of Obsidian Butte, CA
3.1 2005/08/31 15:17:14 33.169N 115.618W 4.5 2 km ( 1 mi) E of Obsidian Butte, CA
1.9 2005/08/31 15:15:50 33.270N 116.357W 20.1 3 km ( 2 mi) NNE of Borrego Springs, CA
1.8 2005/08/31 15:10:14 33.171N 115.609W 5.2 3 km ( 2 mi) E of Obsidian Butte, CA
2.3 2005/08/31 15:03:13 33.179N 115.617W 2.9 2 km ( 1 mi) ENE of Obsidian Butte, CA
1.9 2005/08/31 14:56:53 33.170N 115.605W 3.1 3 km ( 2 mi) E of Obsidian Butte, CA
1.6 2005/08/31 14:53:25 33.183N 115.585W 3.6 5 km ( 3 mi) ENE of Obsidian Butte, CA
3.2 2005/08/31 14:49:01 33.178N 115.622W 4.0 2 km ( 1 mi) NE of Obsidian Butte, CA
2.2 2005/08/31 14:46:52 33.172N 115.612W 4.1 2 km ( 1 mi) E of Obsidian Butte, CA
1.8 2005/08/31 13:10:35 33.237N 115.613W 5.1 8 km ( 5 mi) NNE of Obsidian Butte, CA
1.7 2005/08/31 12:28:00 33.165N 115.619W 3.4 2 km ( 1 mi) ESE of Obsidian Butte, CA
2.4 2005/08/31 11:51:15 33.186N 115.606W 4.6 3 km ( 2 mi) ENE of Obsidian Butte, CA
2.7 2005/08/31 11:48:56 32.090N 115.785W 6.0 67 km (42 mi) WSW of Guadalupe Victoria, Baja California, Mexico
1.7 2005/08/31 11:25:17 33.177N 115.617W 1.5 2 km ( 1 mi) ENE of Obsidian Butte, CA
2.2 2005/08/31 11:05:36 33.180N 115.598W 4.5 4 km ( 2 mi) ENE of Obsidian Butte, CA
2.0 2005/08/31 11:02:50 33.203N 115.593W 2.1 6 km ( 3 mi) NE of Obsidian Butte, CA
2.7 2005/08/31 10:50:33 33.177N 115.612W 5.5 2 km ( 2 mi) ENE of Obsidian Butte, CA
3.4 2005/08/31 09:18:47 33.190N 115.599W 3.5 4 km ( 3 mi) ENE of Obsidian Butte, CA
3.7 2005/08/31 08:35:37 33.188N 115.605W 4.5 4 km ( 2 mi) NE of Obsidian Butte, CA
3.1 2005/08/29 00:39:45 33.208N 115.592W 3.6 6 km ( 4 mi) NE of Obsidian Butte, CA
3.0 2005/08/26 06:45:32 33.168N 116.041W 1.3 9 km ( 6 mi) ENE of Ocotillo Wells, CA