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97789
From: Steven_Redlands, [DNS_Address]
Subject: El Centro had several earthquakes above 4.0 wiithin the last 18 min
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STARTING at 12:38 am https://scedc.caltech.edu/recent/Maps/116-33.html |
97792
From: ryan, [DNS_Address]
Subject: Re: El Centro had several earthquakes above 4.0 wiithin the last 18...
URL: https://www.sfgate.com/bayarea/article/california-active-earthquake-swarm-san-diego-18663306.php
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California sees 'active earthquake swarm' with 29 tremors in under 12 hours An active earthquake swarm is giving San Diego and Imperial counties little shakes By Amy Graff Feb 12, 2024 A series of earthquakes struck El Centro Calif., Feb. 12, 2024 USGS A series of earthquakes — the biggest a tremor with a preliminary magnitude of 4.8 — hit El Centro, Calif., Monday morning and gave Imperial and San Diego counties a load of little shakes, according to the U.S. Geological Survey. The tremors just kept coming as the day continued. All of this rumbling in an area of California near the Mexico border is the result of "an active earthquake swarm," said Stephen DeLong, a supervisory research geologist with the USGS. "It is likely happening on the southern San Jacinto fault," DeLong wrote in an email. "There are several active faults in this area, which can be considered to be near the southern end of the San Andreas fault system." The first big quake struck with a depth of 11 miles about 110 miles east of San Diego at 12:36 a.m. Since the first quake, there have been 29 earthquakes of magnitude 2.5 and above reported in the same area, as of late Monday morning. Of those, a dozen were quakes of magnitude 3.0 and above, one was magnitude 4.5 quake and another magnitude 4.1. It has been a busy night to our east...several small earthquakes have occurred in El Centro in the past 15 minutes. A couple of them were felt at our office 🫨 🫨 As of 12:53 am there have been 13! https://t.co/JDBWfMZ8Uv pic.twitter.com/fMIZW5BsdA — NWS San Diego (@NWSSanDiego) February 12, 2024 A sequence of earthquakes is considered a swarm when many smaller earthquakes hit within the same area, but don't follow a pattern with one large, often damaging, quake followed by several much smaller aftershocks, according to the USGS. Swarms are common in this area, according to DeLong, and generally do not lead to larger earthquakes. But, he added, "There is always a very small possibility that a larger earthquake can follow these smaller earthquakes." This area of the Golden State has a history of quakes with commensurate magnitudes over the past few decades. "A similar swarm appears to have occurred in 2019 under El Centro, though the M4.8 is the strongest earthquake to occur that close to El Centro in many years," DeLong said. "In the past, larger swarms with stronger earthquakes up to a M5.7 in 2010 in the region have occurred closer to both Brawley, CA and Ocotillo, CA." |
Responses:
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97791
From: georg, [DNS_Address]
Subject: Re: El Centro had several earthquakes above 4.0 wiithin the last 18...
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over seventeen kilometers deep on the 4.8 quake ... is that on the offset or on the spreading center ... nearly all double couple so it is likely offset ... just clearing its throat |
Responses:
None
97790
From: jordan, [DNS_Address]
Subject: Re: El Centro had several earthquakes above 4.0 wiithin the last 18...
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good size swarm if it dies ok were good if it keeps going maybe forshocks 2.3 2024/02/12 00:51:36 32.803N 115.568W 10.92 2 km ( 1 mi) NNW of El Centro, CA 1.9 2024/02/12 00:51:08 32.805N 115.545W 14.54 2 km ( 1 mi) NE of El Centro, CA 2.2 2024/02/12 00:50:06 32.801N 115.554W 21.64 1 km ( 1 mi) NNE of El Centro, CA 2.4 2024/02/12 00:48:32 32.815N 115.585W 12.88 4 km ( 2 mi) NW of El Centro, CA 2.5 2024/02/12 00:47:07 32.813N 115.581W 11.13 4 km ( 2 mi) NW of El Centro, CA 2.5 2024/02/12 00:46:47 32.800N 115.544W 12.61 2 km ( 1 mi) NE of El Centro, CA 2.7 2024/02/12 00:45:39 32.809N 115.556W 11.34 2 km ( 1 mi) N of El Centro, CA 3.5 2024/02/12 00:43:52 32.782N 115.544W 10.33 2 km ( 1 mi) ESE of El Centro, CA 4.5 2024/02/12 00:42:48 32.799N 115.572W 15.93 2 km ( 1 mi) NW of El Centro, CA 2.4 2024/02/12 00:42:43 32.825N 115.574W 7.72 3 km ( 2 mi) S of Imperial, CA 2.6 2024/02/12 00:41:52 32.819N 115.596W 13.02 4 km ( 2 mi) SW of Imperial, CA 3.0 2024/02/12 00:41:34 32.821N 115.574W 12.77 3 km ( 2 mi) S of Imperial, CA 3.1 2024/02/12 00:40:05 32.791N 115.561W 8.79 0 km ( 0 mi) NW of El Centro, CA 3.5 2024/02/12 00:39:19 32.800N 115.560W 10.33 1 km ( 1 mi) N of El Centro, CA 3.9 2024/02/12 00:38:34 32.820N 115.597W 7.37 4 km ( 2 mi) SW of Imperial, CA 3.7 2024/02/12 00:38:26 32.814N 115.584W 11.74 4 km ( 2 mi) NW of El Centro, CA 3.6 2024/02/12 00:38:13 32.841N 115.574W 13.98 1 km ( 1 mi) SSW of Imperial, CA 4.8 2024/02/12 00:36:25 32.815N 115.575W 18.9 3 km ( 2 mi) NNW of El Centro, CA |
Responses:
None
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