Things are shaking up here in LA county

restlessinMT
Some crazy stuff is going on in Cali but seems to be affecting my neck of the woods too. Have any of you checked out the rumblings going on in Yellowstone the past few hours! It is going crazy! I hope this ride doesn't get any worse!

Here's some recent info on Yellowstone, and you're correct...it seems rather busy today.

Does anyone know whether this is normal activity?

ETA
Seems there was a 4.8 just over a few hours ago with a depth of 6.8 km which is 4.22 miles. Is this shallow?

The focus of an earthquake is the actual point underground where rocks break. The depth of the focus can be categorized as shallow (up to 70 km below the surface), intermediate (70 to 300 km), or deep (greater than 300 km).

Hope this helps!
( 70 Km= 43.4 miles)

Thanks for the link to Calif earthquake history, PublicEnemyNo1. It's an interesting read. As you said, it's been awhile since the last good shake in Northridge. I guess that's what concerns me most. We are due.

The Palos Verdes Peninsula is just to the south of where I live. I clearly see it sitting on my balconey. I read a study one time that was conducted by USC that was kind of an eye opener. It described how they discovered sections along the peninsula that were anything but stable. The report mentioned that a significant enough quake just off the shoreline (somewhere in the 7 mag range) could cause portions of the peninsula to collapse into the ocean, causing an immediate and overwhelming tsunami that would devastate the entire LA Bay. I've gotta admit, that thought does occasionally occur to me.

Oh well, whatever will be will be. No point dwelling on it. As Pharyax pointed out a couple posts back, the likelyhood of dying, or even being injured, in a quake is pretty low. For the most part it'll just scare the hell out of us, and life will go on. For me, anyway, that's how I try to look at it...

FYI
My sis is in Mission Viejo. I sent her an email asking if she felt the earthquakes. She said yes. One at night on the 28th and one on the 29th in the afternoon. That's all she could tell me. Not a very informative sister...

Wrabbit2000
I have a question....

How do you have a quake at 0.1 km depth?? Isn't that like...ground level?

It called fracking in a fault rich environment, and it is a very intellectual thing to do.

Bachrk
FYI
My sis is in Mission Viejo. I sent her an email asking if she felt the earthquakes. She said yes. One at night on the 28th and one on the 29th in the afternoon. That's all she could tell me. Not a very informative sister...

edit on 30-3-2014 by Bachrk because: (no reason given)

They are unusual IMO, I have lived here in LA my whole life, yet these seem to be different. It feels like what I can only describe as being on top of water, like a tub sloshing around...

netbound

The Palos Verdes Peninsula

The report mentioned that a significant enough quake just off the shoreline (somewhere in the 7 mag range) could cause portions of the peninsula to collapse into the ocean, causing an immediate and overwhelming tsunami that would devastate the entire LA Bay.

Yikes! The entire PVP could collapse into the sea in a moment?! That would tsunami probably the entire county of LA if not also adjoining counties more north, south and inland.

www.appliedfluids.com...

^ PVP Underwater Landslide Scenario - very deserving of its own topic of discussion on ATS!

www.upi.com...

Yellowstone holy S***. Hope you guys are safe over there, good luck!

spurgeonatorsrevenge

They are unusual IMO, I have lived here in LA my whole life, yet these seem to be different. It feels like what I can only describe as being on top of water, like a tub sloshing around...

Could it be our version of a 'crust' which is fine sand/sediments, is now totally saturated with water from decades of fracking for oil throughout LA County (ie, the Signal Hill and Whittier oil booms)

In that case, the Palos Verde Peninsula is ripe for the Underwater Landslide Tsunami scenario! why aren't today's scientists & engineers planning for this?!?

www.appliedfluids.com...

reply to post by ThePublicEnemyNo1


Most likely not "normal" largest Quake since 1980 according to:

www.upi.com...

Eagleyedobserver
reply to post by ThePublicEnemyNo1

 

Most likely not "normal" largest Quake since 1980 according to:

www.upi.com...

edit on 30-3-2014 by Eagleyedobserver because: (no reason given)

Thanks for the link, it was very insightful 👍

reply to post by netbound


I suppose you're right about worrying. It's just frustrating to know what we're facing and that there's nothing we can do about it.

We all know it's coming sooner or later, this much is true. I just find the 20-25 year distance in recent Los Angeles and immediate surrounding area quakes quite concerning. I know there's no scientific value to the time in between quakes, but it's just ironic.

Stay 👉 safe.

ETA
I just thought I add a bit. Just months prior to the Northridge quake, I lived just up the hill in Altadena, overlooking Eaton Canyon...I lost my house in the October 1993 fire. Near the time rebuilding was to start, we got sacked with the Northridge earthquake.

I've been through hell up here and not looking forward to anymore crap out of Mother Nature anytime soon. 20 years isn't nearly a break for me

1993 Altadena Fires Residential Loss
1993 Fires

reply to post by ThePublicEnemyNo1

I agree with you, PublicEnemyNo1, regarding the interval between quakes. I think these events do follow a certain rough pattern. And, like I said, we're due a good shake.

One thing is for sure. LA will definately be hit with a major quake (7+). That you can count on. Most likely it will be due to a rupture along the San Andreas fault. And, from what I've read, there's a very good chance it will happen within the next 20 years. Then again, it may happen tonight. Who knows? Thing is, in all likelyhood, you'll come out of it OK and have a good story for your grand kids some day.

netbound
reply to post by ThePublicEnemyNo1

 

I agree with you, PublicEnemyNo1, regarding the interval between quakes. I think these events do follow a certain rough pattern. And, like I said, we're due a good shake.

One thing is for sure. LA will definately be hit with a major quake (7+). That you can count on. Most likely it will be due to a rupture along the San Andreas fault. And, from what I've read, there's a very good chance it will happen within the next 20 years. Then again, it may happen tonight. Who knows? Thing is, in all likelyhood, you'll come out of it OK and have a good story for your grand kids some day.

Considering the possibilities, your post made me feel much better. I wish I had you as a neighbor during hard times 👍😄👍

Thank you.

From what I understand, the many average magnitude earthquakes occurring in and around California are a good sign that stress along the subducting plates is being relieved without causing too much damge, and not allowing the stress to build to higher magnitude proportions when the plates finally shock-slip past each other.

The real area of concern is where little to no earthquakes occur, and that is the Southern end of the San Andreas Fault (SAF). It does have a periodical slippage of decades, rather than regular small quakes signifying stress relief, and there has been no stress relief for this region for over a hundred years, so if a big one is going to happen, I would think it would come when the Southern end of the SAF jolts.

The 1906 San Francisco earthquake was caused by a slippage of 21 feet at the Northern end of the SAF, but the Southern end has remaind pretty quiet for some time now, signifying it to be under extreme pressure and ready to go?

Yuri Fialko, a geophysicist thinks that if it does slip, it may do so by up to 7 to 10 meters, which will cause a high magnitude quake...

www.sanandreasfault.org...

ThePublicEnemyNo1
I'm officially freaking out now...lots of these lately. Pretty strong too.

Wow!

Add to this the Oklahoma swarm over the weekend and yestreday's 4.8 in Yellowstone...

Getting ready to get real interesting, real quick.

Earthquakes happening at such shallow depths as these, and so many of them at that shallow depth is disturbing. It implies that there is more pressure than usual coming from at near the top of the fault line, then moving downwards. That means that the plates could be splitting apart at certain areas, and causing nearby and connecting fault lines to rupture.

Either that, or as if someone is detonating bombs in the fault lines at shallow depths, if you wanted an alternative explanation.

And now, the 8.2 quake that just struck Chile....

Wow.

As I said, things are getting interesting...real quick.

Part of me really wants to think that this is just the earth doing its normal thing.

My brain, however, tells me that there is probably more to it.

HAARP, fracking, and now high energy lasers for directing lighting. The government is showing that it wants control over mother nature, and I think that this might have something to do with all of the earthquakes.