Risk of big earthquake on San Andreas fault rises after quake swarm at Salton Sea


#1

The rumbling started Monday morning deep under the Salton Sea. A rapid succession of small earthquakes — three measuring above magnitude 4.0 — began rupturing near Bombay Beach, continuing for more than 24 hours. Before the swarm started to fade, more than 200 earthquakes had been recorded.

The temblors were not felt over a very large area, but they have garnered intense interest — and concern — among seismologists. It marked only the third time since earthquake sensors were installed there in 1932 that the area had seen such a swarm, and this one had more earthquakes than the events of 2001 and 2009.

The quakes occurred in one of California’s most seismically complex areas. They hit in a seismic zone just south of where the mighty San Andreas fault ends. It is composed of a web of faults that scientists fear could one day wake up the nearby San Andreas from its long slumber.

http://www.trbimg.com/img-57eeabf2/turbine/la-me-g-ln-earthquake-swarm-20160930/500/500x281

latimes.com/local/lanow/la-me-ln-earthquake-swarm-20160930-snap-story.html


#2

Did anything happen after the 2001 and 2009 swarms?


#3

How deep are they?


#4

My favorite earthquake song, Day After Day (it’s slippin’ away) by Shango. I think of it whenever I hear these reports. Its such a happy way to face impending disaster :slight_smile:

youtube.com/watch?v=ow7ilAs0ZfA


#5

According to the LA Times article, 3 - 7 miles. According to the US Geological Survey website, which hasn’t been updated since yesterday, 2.5 - 6 miles. Here is the raw data compiled by the Cal Tech Earthquake Data Center:

scedc.caltech.edu/recent/Maps/116-33.html

I admit, I don’t understand earthquakes. How does the depth of these quakes matter?


#6

The Salton Sea is an interesting location. It is the largest lake in California, but it was created by accident 110 years ago.The pressure of all that water may influence the earthquake activity. This is known to be the case with man-made reservoirs.

According to the LA Times article, a major earthquake on the southern part of the San Andreas fault is expected every 150 year or so, but one hasn’t occurred for over 300 years.

Has the presence of the Salton Sea suppressed earthquakes which might have otherwise occurred?


#7

openhazards.com/faq/earthquakes-faults-plate-tectonics-earth-structure-user-submitted-questions/there-correlation


#8

Prayers for all those living in that area. I have been thru several fairly strong earthquakes, (5.8) and I know how frightening they are. God Bless, Memaw


#9

Ive always heard once the ‘big one’ happens in SoCal, it will literally split the lower half of the state and create a new bay in the process.

Really though, something that devastating happening, I think the entire nation would be negatively effected by it, may take decades to recover from, if at all.


closed #10

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