The Obsidian Butte swarm is continuing this afternoon, with an escalation in the rate of small earthquakes & in the magnitudes that are occurring. At 2:49 pm & 3:17 mw, we saw a ML3.2 & an ML3.1. At 3:45 pm there was a ML3.4, followed closely by a pair of ML4.4 events. These occurred at 3:47 pm & 3:50 pm. All the locations are in the same area northeast of Obsidian Butte.
Swarms such as this are not uncommon in the Imperial Valley & similar sequences of events have occurred near Obsidian Butte.
The swarm continues. Overnight there were nine more small quakes in the northern Imperial Valley, culminating in a ML3.6 at 8:35 am. The locations are still about 2 miles east-northeast of Obsidian Butte, along the shore of the Salton Sea. A ML3.6 is quite feelable.
A small handful of quakes occurred overnight in the northern Imperial Valley, in the Salton Sea Wildlife Refuge, 3 miles northeast of Obsidian Butte. The largest two were a ML3.1 at 12:39 am & a ML3.0 at 12:41 am. We have not felt reports, but both were probably feelable.
A small quake, ML2.6, was felt overnight in the Goleta, Santa Barbara & Lompoc areas. The time was 11:18 pm & the epicenter was located offshore, 3 miles south-southeast of Isla Vista.
Early this morning, at 6:45 am, there was a ML3.0 quake in the complex San Jacinto fault zone, in a sparsely inhabited area 6 miles east-northeast of Ocotillo Wells. It was probably felt, but so far we have no reports.
August 25, 2005
This report covers the seven day period ending 17:00 on August 25/2005. During this period we detected and analyzed 321 earthquakes.
The table below lists the quakes during the past week that were M2.0 or larger in the central part of the coverage area. Times are local times; if you want Greenwich Mean Time, add 7 hrs to the Pacific Daylight Time or 8 hrs to the Pacific Standard Time listed.
Mag. PST Date PST Time Lat. Long. Depth Descriptive location -------------------------------------------------------------------------------------------
14174596 2.3 2005/08/18 20:49:26 32 10.3 N 115 16.6 W 6.0 59 km (37 mi) SSE of Calexico, CA 14174644 2.5 2005/08/18 23:08:32 34 7.2 N 117 58.0 W 13.0 4 km ( 2 mi) N of Baldwin Park, CA Felt in Monrovia and Bradbury 14174656 2.4 2005/08/19 00:01:50 34 7.0 N 117 58.0 W 12.9 4 km ( 2 mi) N of Baldwin Park, CA Felt in Monrovia and Bradbury 14174704 2.3 2005/08/19 03:55:28 34 6.9 N 117 58.2 W 13.0 3 km ( 2 mi) NNW of Baldwin Park, CA 14174716 2.1 2005/08/19 04:12:06 32 23.2 N 115 11.7 W 6.0 42 km (26 mi) SE of Calexico, CA 14174732 2.3 2005/08/19 04:21:08 34 6.9 N 117 57.9 W 12.6 3 km ( 2 mi) N of Baldwin Park, CA 14174964 2.6 2005/08/19 19:21:24 34 57.6 N 119 9.8 W 11.3 21 km (13 mi) WSW of Wheeler Ridge, CA 14175180 2.0 2005/08/20 11:17:49 34 0.7 N 117 10.1 W 11.2 5 km ( 3 mi) S of Redlands, CA 14175600 2.1 2005/08/21 19:21:48 32 48.5 N 115 27.2 W 15.7 9 km ( 6 mi) E of El Centro, CA 14175660 2.8 2005/08/21 22:00:18 33 11.0 N 115 36.0 W 4.1 4 km ( 2 mi) ENE of Obsidian Butte, CA Possibly felt in Obsidian Butte 14175796 2.1 2005/08/22 09:46:35 32 34.5 N 117 15.4 W 13.4 18 km (11 mi) SSW of San Diego, CA 14176188 2.3 2005/08/23 19:14:51 34 0.8 N 117 10.1 W 11.6 5 km ( 3 mi) S of Redlands, CA 14176196 2.9 2005/08/23 19:46:01 34 1.4 N 117 1.0 W 19.3 2 km ( 1 mi) SE of Yucaipa, CA Felt in Yucaipa, Redlands, Arcadia, Calimesa, Highland, San Bernardino, Riverside, and as far away as Winchester and Moreno Valley. If you felt this quake, and would like to report it, click here. 14176320 2.4 2005/08/24 05:50:08 34 5.3 N 117 12.0 W 6.8 4 km ( 3 mi) NNW of Redlands, CA 14176616 2.8 2005/08/24 22:38:41 34 24.4 N 119 26.4 W 6.0 7 km ( 5 mi) E of Carpinteria, CA Felt in Carpinteria 14176696 2.6 2005/08/25 11:18:07 34 23.0 N 119 50.1 W 6.8 4 km ( 2 mi) SSE of Isla Vista, CA
A few people felt a ML2.8 quake last night in Carpinteria. The time was 10:38 am & the epicenter was located 4 miles east of Carpinteria.
A ML2.9 quake was felt by a few people at 7:46pm last night (Tuesday), in Yucaipa & Redlands. The epicenter was located 2 miles east of Yucaipa.
Overnight, there was a small cluster of small earthquakes in the Irwindale area, just west of the Santa Fe Dam recreation area. The largest ones were a pair of ML2.4’s at 11:08 pm & 12:01 pm. There were also ML2.3’s at 3:55 am & 4:21 am. The focal mechanisms are strike-slip. Nine events were recorded in all. I have a very small handful of felt reports for the ML2.4’s, from Bradbury & Monrovia.
A Coso Earthquake Swarm continues with more than 60 quakes this week. Most of which have been very small, less than M1.5. The largest in the sequence has been a M1.9, which was on 08/17 at 12:19 PM. This quake was located 8 km ( 5 mi) east of Coso Junction, CA. The weekly seismicity map, shown below, plots these 60 earthquakes in the upper portion of the image.
August 18, 2005
This report covers the seven day period ending 17:00 on August 18, 2005. During this period we detected and analyzed 254 earthquakes.
The table below lists the quakes during the past week that were M2.0 or larger in the central part of the coverage area. Times are local times; if you want Greenwich Mean Time, add 7 hrs to the Pacific Daylight Time or 8 hrs to the Pacific Standard Time listed.
Mag. PST Date PST Time Lat. Long. Depth Descriptive location -------------------------------------------------------------------------------------------
14172228 3.6 2005/08/11 23:35:55 32 35.3 N 118 6.6 W 18.0 34 km (21 mi) SE of San Clemente Is. 14172468 2.8 2005/08/12 16:47:08 32 9.0 N 115 49.3 W 7.7 65 km (41 mi) SSW of Calexico, CA 14172516 2.1 2005/08/12 20:18:21 32 16.0 N 115 6.5 W 3.8 58 km (36 mi) SE of Calexico, CA 14172588 2.8 2005/08/13 02:55:13 32 37.0 N 118 6.0 W 24.2 32 km (20 mi) SE of San Clemente Is. 14172728 2.4 2005/08/13 19:20:42 32 21.2 N 115 15.1 W 17.1 42 km (26 mi) SSE of Calexico, CA 14172892 2.3 2005/08/14 15:36:31 32 8.4 N 115 17.0 W 6.0 62 km (38 mi) SSE of Calexico, CA 14173296 2.0 2005/08/14 23:10:39 32 9.9 N 115 50.1 W 5.4 64 km (40 mi) SSW of Calexico, CA 14173684 2.3 2005/08/15 11:53:13 34 59.8 N 116 56.8 W 4.5 14 km ( 9 mi) NNE of Barstow, CA 14173968 2.1 2005/08/16 14:16:37 32 23.5 N 115 2.4 W 6.0 52 km (32 mi) SW of Yuma, AZ 14174060 2.1 2005/08/16 21:53:33 35 20.8 N 120 55.0 W 0.0 7 km ( 4 mi) WSW of Morro Bay, CA 14174120 2.9 2005/08/17 04:47:33 32 15.6 N 115 10.9 W 32.1 54 km (34 mi) SSE of Calexico, CA 14174132 2.0 2005/08/17 07:27:58 32 13.9 N 115 9.2 W 16.3 58 km (36 mi) SSE of Calexico, CA 14174164 2.2 2005/08/17 08:29:28 35 45.3 N 120 21.7 W 0.1 7 km ( 4 mi) WNW of Cholame, CA
Powered by WordPress
