Skip to comments.SoCal Experiencing Surge in Earthquake Activity
Posted on 04/13/2010 7:10:57 PM PDT by bd476
SoCal Experiencing Surge in Earthquake Activity
70 quakes greater than a magnitude 4.0 have struck the region this year -- more than any year in the past decade.
11:08 AM PDT, April 13, 2010
LOS ANGELES -- Southern California, along with Baja California, has seen a surge in moderate earthquake activity this year and scientists are trying to figure out what's causing the uptick.
There have been 70 quakes greater than a magnitude 4.0 so far this year. That's the most of any year in the last decade -- and, it's only April. There were 30 in 2009 and 29 in 2008.
Seismologists say they are looking into the recent surge but they can not yet fully explain it.
The string of earthquakes could mean that Southern California might again be entering a more active seismic period, and more significant quakes could be on the way, according to experts.
Scientists also said the increase does not mean the Big One is more likely to hit.
Egill Hauksson, a geophysicist at Caltech, told The Los Angeles Times that the rate of quakes in the region is "probably . . . picking up again" after a relative lull that lasted more than a decade.
"What it means is that we are going to have more earthquakes than in the average year. With more earthquakes, we're bound to have more bigger ones. But there are always fewer of those than the smaller ones."
Caltech seismologist Kate Hutton said experts would like to be able to explain the surge, but "there's no real correlation with any cause."
Many of the quakes this year have been aftershocks to the 7.2 magnitude temblor that struck the Mexicali area, killing two people. The border had previously experienced a swarm of earthquakes.
Scientists say one of their biggest concerns remains the San Andreas fault, which has produced some of the state's largest earthquakes and is said to be overdue for a major event.
Excerpted article from Los Angeles Times
More moving and shaking, but why?
By Cara Mia DiMassa
April 12, 2010
< Snip >
... The number of earthquakes greater than magnitude 4.0 in Southern California and Baja California has increased significantly in 2010. There have been 70 such quakes so far this year, the most of any year in the last decade. And it's only April. There were 30 in 2009 and 29 in 2008.
< Snip >
...The public's awareness of quakes around the globe also has increased with technology. Individuals on Twitter, for example, often first hear about a major quake from fellow users.
And the details of earthquakes, including location and size, have been much better distributed through e-mail, blogs and Twitter feeds. Earthquakes in remote oceans, say, were once noted only by scientists at academic and government institutions. Now, quake enthusiasts can have the details of such a quake delivered to their cellphones minutes after it occurs.
In California, scientists say one of their biggest concerns remains the San Andreas fault, which has produced some of the state's largest earthquakes. Experts have said the San Andreas is overdue for a major event. State officials have also often noted that only about one in six Californians has , with the high cost and large deductibles deterring many homeowners from buying policies.
"As we are building along the San Andreas fault, our exposure to the shaking hazard increases," said Mark Benthien, director of communication, education and outreach for the Southern California Earthquake Center. "And the losses we get in earthquakes increase as well. That's part of the equation."
Hauksson, the Caltech geophysicist, said it's easy to read too much into the upsurge of quakes this year.
Though it comes after several more quiet years, he noted that it's not uncommon for one large quake to produce months -- if not years -- of increased seismic activity. So in that sense, 2010's quake pattern is fairly typical...
End of excerpted article
Read the entire article here: More moving and shaking, but why?
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I am still hoping for it to sink into the Pacific
Its all the illegal aliens coming in we are going to capsize into the ocean
Could this possibly be looked at in a positive light, meaning that the chances of having the BIG ONE occur has decreased?
Some scientists believe that—the little shifts relieve enough pressure to prevent a big one.
And let’s not forget there are a lot of conservatives & military in CA.
It’s not just here but apparently the whole Pacific rim. I cannot recall this many 7.x earthquakes around the Pacific in such a short period of time.
I thought that was downgraded to 6.9?
Reasonable and knowledgeable observers can suppose that the activity makes it more likely that a big quake will occur and others will propose that the rash of quakes eases pressure on the faults. Time will tell.
I’m watching the movie 2012....again right now.
I’m in Alaska, former Kalifornia refugee.
To be frankly honest, I would move to firmer ground, like Utah?
More moving and shaking, but why?It's all Big Maybelle's fault.
Depth 10 km (6.2 miles) (poorly constrained)
Distances * 17 km (11 miles) WSW (258°) from Guadalupe Victoria, Baja California, Mexico
When “the big one” hits So-Cal, you won’t find out through Twitter because the net will be down.
That would put you closer to the Yellowstone super volcanoe...
They do not know what the increase in EQs over 4.0 indicates but they are hard at work trying to figure out what it means.
They do know that earthquakes occur in cycles, with some low activity periods occurring. Southern California is coming out of a low activity cycle.
Despite researching earthquakes for decades, the best information from geophysicists at this time is that no one knows or can predict with certainty whether an increase in the number of over 4.0 magnitude quakes foretells an imminent very large magnitude earthquake until after the very large magnitude quake has occurred.
The best plan is to always be prepared.
Thank you, Ernest!
See #20 and #39 and the links there....
Plate tectonics was the old hypothesis about what the earth was doing...now there are competing theories known as the expanding earth and Surge Tectonics.
Just felt shaking here in the Fallbrook area North of San Diego...A Shake and rolling motion....
I’m really sick of you people and your sink into the Pacific crap. There’s one “H” of a lot of good Conservatives, one “H” of a lot of good Americans here in California, as well it’s the home of Free Republic.
Hopefully you have contributed to the cause of FReedom as we here at the ranch have, and have sent something to keep FR alive and well.
Well, I still have family and friends there, so I think your comment is rude.
They have shakes, too.
True, there have been many, but again, earthquakes appear to occur in cycles.
True and you summed it up nicely. :)
Yikes. More than 2800 in the past week. Usually it’s somewhere between 250 and 400 a week.
No can do.
The continent is thicker than the ocean is deep.
Best we can hope for is it splits away from the rest of North America...
[...and still counting until 2014]
"this trend needs to be understood in relation to the increase in seismographs. Certainly, in the last 25 years, more lower intensity earthquakes have been noticed because of a general increase in the number of seismograph stations across the world and improved global communications. This increase has helped seismological centres to locate many small earthquakes which were undetected in earlier decades. Therefore, an upward trend is not unexpected in the graph, although the rise in the number of large earthquakes will be of more significance to our assessment of the trend.
By limiting the range of earthquakes being counted in this report to magnitude 7 or above, it means these earthquakes can easily be identified by a limited number of seismographs, and we have ensured that any increase in frequency for these larger earthquakes cannot be down to the increase in overall detection rates in this 25-year period, as all these larger earthquakes are able to be easily detected with fewer seismograph stations."
Alaska? Alaska ??Eye of Unk wrote: "To be frankly honest, I would move to firmer ground, like Utah?"
Here, this says it best regarding your move to the home of extremely large earthquakes:
Agree. That's an excellent idea.
Why would anyone take that comment seriously? Seriously, I don’t even think its possible.
A rolling motion is suppose to mean that you are some distance from it....heard that the other day.
Because it wasn’t funny... I guess you had to grow up in Earthquake country to understand why it’s not funny.
Yes Alaska has many times more quakes than California, I think its of an order of 100 times as much.
And thats good, all the pressure is let off on a daily basis, we don’t have big ones very often, nothing compared to SF, LA and such.
Yeah we one in 1964, nothing much since then. I felt a 4.6 last week, most are 3.0 and smaller, we ignore them and I really don’t notice them.
Didn't some democrat say recently something about an island somewhere capsizing and sinking? He actually thought islands "float" on the water.
lol. Yes, that was really stupid. Islands are really the backs of giant turtles, everyone knows that. /s
Hmmm..... maybe the Earth's crust is shifting?
Were are taking Free Republic with us if we go!
LOL! Thanks Willie.
Thanks for the link and reference material, ETL. :)
Fresno is on the North American Plate. The server farm is here in Silicon Valley, east of the San Andreas, west of the Hayward. Too close to call...
Heading northbound? Lean right! LEAN RIGHT!
There is also the thought that an earthquake actually increases the amount of stress on a fault.
Now, just breaking, China:
I agree. Not only does the whole "sink into the Pacific" crap show an utter ignorance of geology, but they don't seem to realize that there are more NRA members (and thus conservatives) in California than any other state. Not to mention it isn't all palm trees and beaches here. We have the highest mountains outside of Alaska here.
Hey, I am hoping for beach front property here in Phoenix.
Strategerist did not authorize THAT!