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Moderate quakes shake Southern Calif.; no damage
AP ^ | may 22, 1 hr ago | AP

Posted on 05/22/2010 1:25:21 PM PDT by Ernest_at_the_Beach

) – 1 hour ago

SAN DIEGO — A series of moderate earthquakes south of the California border on Saturday shook buildings in downtown San Diego but there were no reports of damage or injuries.

The U.S. Geological Survey says a magnitude-4.9 earthquake struck at 10:30 a.m. Saturday, centered in Baja California about 16 miles southwest of Calexico. A magnitude-4.8 earthquake struck about three minutes later, followed by a 3.6 quake at 10:59 a.m.

San Diego County Sheriff's Lt. Hank Turner says shaking was felt in downtown San Diego. Dispatchers received no calls reporting damage or injuries.

Saturday's earthquakes struck in the same area as the magnitude-7.2 quake that killed two people in Mexicali, Mexico, on April 4. The region has seen a surge in seismic activity since then.

THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.

SAN DIEGO (AP) — A series of moderate earthquakes south of the border shook buildings in downtown San Diego but there are no reports of damage or injuries.

The U.S. Geological Survey says a magnitude-5.3 earthquake struck at 10:30 a.m. Saturday, centered in Baja California about 16 miles southwest of Calexico. A magnitude-4.9 earthquake struck about three minutes later, followed by a 3.6 quake at 10:59 a.m.

(Excerpt) Read more at google.com ...


TOPICS: Mexico; News/Current Events; US: California
KEYWORDS: bajacalifornia; earthquake

1 posted on 05/22/2010 1:25:21 PM PDT by Ernest_at_the_Beach
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To: bd476
MAG UTC DATE-TIME
y/m/d h:m:s
LAT
deg
LON
deg
DEPTH
km
LOCATION
MAP 3.9 2010/05/22 20:15:52 32.571 -115.759 3.8   25 km ( 16 mi) SSW of Seeley, CA
MAP 3.0 2010/05/22 19:57:38 32.577 -115.743 2.4   24 km ( 15 mi) SSW of Seeley, CA
MAP 3.0 2010/05/22 18:34:03 32.558 -115.730 3.3   25 km ( 16 mi) WSW of Calexico, CA
MAP 3.6 2010/05/22 17:59:45 32.583 -115.777 2.4   25 km ( 15 mi) SSW of Seeley, CA
MAP 4.8 2010/05/22 17:33:17 32.622 -115.802 0.0   22 km ( 13 mi) SSW of Seeley, CA
MAP 4.9 2010/05/22 17:30:57 32.593 -115.756 5.4   23 km ( 14 mi) SSW of Seeley, CA

2 posted on 05/22/2010 1:28:09 PM PDT by Ernest_at_the_Beach ( Support Geert Wilders)
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To: ErnBatavia

Feel anything?


3 posted on 05/22/2010 1:29:03 PM PDT by Ernest_at_the_Beach ( Support Geert Wilders)
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To: Ernest_at_the_Beach

4 posted on 05/22/2010 1:30:14 PM PDT by Ernest_at_the_Beach ( Support Geert Wilders)
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To: Ernest_at_the_Beach

I felt nothing in RB.


5 posted on 05/22/2010 1:32:03 PM PDT by CAluvdubya (Free SoCalPol!)
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To: Ernest_at_the_Beach
WHEW! Ernest

BTW, still no oil on my beaches.

6 posted on 05/22/2010 1:33:14 PM PDT by blam
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To: Ernest_at_the_Beach

They shook the South40 estate pretty well.


7 posted on 05/22/2010 1:37:03 PM PDT by South40 ("Islam has a long tradition of tolerance." ~Hussein Obama, June 4, 2009, Cairo, Egypt)
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To: blam
Well,...that's good.

Some thing is rocking and rolling south of the Salton Sea .

8 posted on 05/22/2010 1:37:07 PM PDT by Ernest_at_the_Beach ( Support Geert Wilders)
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To: South40

How close is the estate?


9 posted on 05/22/2010 1:38:13 PM PDT by Ernest_at_the_Beach ( Support Geert Wilders)
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To: Ernest_at_the_Beach
"Some thing is rocking and rolling south of the Salton Sea . "

Good luck and stay alert.

10 posted on 05/22/2010 1:40:42 PM PDT by blam
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To: CAluvdubya
I felt nothing in RB.

RB?

11 posted on 05/22/2010 1:50:44 PM PDT by ETL (ALL (most?) of the Obama-commie connections at my FR Home page: http://www.freerepublic.com/~etl/)
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To: blam
Hey I was wandering around and came across this....:

Stress-Triggered Earthquakes

******************************EXCERPT********************************

A moderate quake struck southern California right where it was supposed to

A moderate earthquake (magnitude 5.4) in southern California on February 22, 2003 occurred in an area of increased underground stress. It's a fresh example of a promising direction in seismic forecasting.

The stress-triggering theory makes intuitive sense: large earthquakes cause stress release on the faults where they occur, but they also add and subtract stresses on the surrounding region. A seismic event, by changing the stresses around it, can make one quake less likely and another one more likely. Ross Stein, a U.S. Geological Survey scientist who is the main driver of this line of research, calls this interaction "earthquake conversations."

An example is the San Francisco Bay area, where the great earthquake of 1906 reduced stresses across the bay, causing a lull in moderate-sized quakes that lasted the rest of the 20th century. The opposite occurred in Turkey along the great North Anatolian fault. A large quake in 1939 sent stresses farther down the fault, triggering a 60-year series of quakes whose latest installment was the deadly Izmit earthquake of 1999. The stresses have risen in the crust near the city of Istanbul, and a quake there is now considered more likely.

Let's see how it works in southern California. A decade ago on the morning of 28 June 1992, the magnitude-7.4 Landers quake changed stresses over a wide region shown on the map below. Red is higher, purple is lower stress.


"Coulomb" stress changes in southern California after Landers earthquake. Pacific Ocean at lower left, Salton Sea at lower right. San Andreas fault zone runs northeast from Salton Sea; Pinto Mountain fault runs east-west in center. White dots are significant aftershocks. All images courtesy U.S. Geological Survey.

Three hours after this earthquake, the magnitude-6.5 Big Bear quake occurred where the stress rise was the greatest (the gray dots are aftershocks and other unrelated earthquakes):

In the nine years afterward, other earthquakes including the Hector Mine quake struck in different parts of the post-Landers stress pattern, but as of the end of 2001 little had changed in the part near Big Bear. If you were looking at this map below, where might you forecast the most likely quake in that part?

Now see where the February 22 event took place:

So this earthquake fits Stein's theory quite well. The only strike against it is that it's not a large quake and won't change the stresses around Big Bear much. But another quake this size happened in the same place on 26 October 1998, and a 5.1 quake occurred nearby in February 2001. A few more of these will start to add up.

********

Ross Stein's research group at the USGS has some great supporting information online. The stress images come from a fascinating animation there. You can also read a very lucid version of his thinking in the January 2003 Scientific American in the article "Earthquake Conversations."

And I was up close to the Hector Mine Quake....


12 posted on 05/22/2010 1:53:43 PM PDT by Ernest_at_the_Beach ( Support Geert Wilders)
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To: ETL

Rancho Bernardo.

It was a nice slow roller in Mission Bay.


13 posted on 05/22/2010 2:00:58 PM PDT by Francis McClobber
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To: Ernest_at_the_Beach

East San Diego County, about 60 miles away.


14 posted on 05/22/2010 2:02:09 PM PDT by South40 ("Islam has a long tradition of tolerance." ~Hussein Obama, June 4, 2009, Cairo, Egypt)
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To: Francis McClobber

>Rancho Bernardo.

Thanks for the clarification.

“Rancho Bernardo is in the northern hills of the city of San Diego, California.”

http://en.wikipedia.org/wiki/Rancho_Bernardo,_San_Diego,_California


15 posted on 05/22/2010 2:04:54 PM PDT by ETL (ALL (most?) of the Obama-commie connections at my FR Home page: http://www.freerepublic.com/~etl/)
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To: ETL

It’s on the I-15....


16 posted on 05/22/2010 2:13:29 PM PDT by Ernest_at_the_Beach ( Support Geert Wilders)
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To: Ernest_at_the_Beach
Oh.

I see something I recognize, Big Bear.

I spent Christmas there four years ago, on the lake.

17 posted on 05/22/2010 2:15:14 PM PDT by blam
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To: Ernest_at_the_Beach
I will certainly be sitting on the toilet just like when the Northridge one hit. At 0431 AM.

I have not problems with constipation since that quake.

18 posted on 05/22/2010 2:21:26 PM PDT by BobS
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To: Ernest_at_the_Beach

We felt the 10:30 one....a little jolt that tipped over a small picture frame on the dresser.


19 posted on 05/22/2010 2:28:07 PM PDT by ErnBatavia (It's not the Obama Administration....it's the "Obama Regime".)
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To: BobS

TMI!!


20 posted on 05/22/2010 3:26:15 PM PDT by donozark (Restraining orders are just another way of saying I love you....)
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To: Ernest_at_the_Beach

Fresno is where California earthquakes go to die.


21 posted on 05/22/2010 9:25:26 PM PDT by TenthAmendmentChampion (Darwinism is to Genesis as Global Warming is to Revelations.)
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