[ ]   [ ]   [ ]                        [ ]      [ ]   [ ]

Trump - rgio - Mar 28, 2024 - 7:29am
 
Radio Paradise Comments - islander - Mar 28, 2024 - 7:00am
 
NYTimes Connections - islander - Mar 28, 2024 - 6:55am
 
Wordle - daily game - islander - Mar 28, 2024 - 6:47am
 
Breaking News - black321 - Mar 28, 2024 - 6:25am
 
Outstanding Covers - thisbody - Mar 28, 2024 - 5:51am
 
NY Times Strands - Proclivities - Mar 28, 2024 - 5:34am
 
Today in History - DaveInSaoMiguel - Mar 28, 2024 - 4:28am
 
Ukraine - NoEnzLefttoSplit - Mar 28, 2024 - 2:36am
 
The Obituary Page - ScottFromWyoming - Mar 27, 2024 - 10:58pm
 
March 2024 Photo Theme - Many - KurtfromLaQuinta - Mar 27, 2024 - 8:52pm
 
USA! USA! USA! - R_P - Mar 27, 2024 - 7:40pm
 
Little known information...maybe even facts - haresfur - Mar 27, 2024 - 6:21pm
 
Live Music - oldviolin - Mar 27, 2024 - 5:08pm
 
RightWingNutZ - R_P - Mar 27, 2024 - 3:48pm
 
Lyrics that strike a chord today... - miamizsun - Mar 27, 2024 - 2:44pm
 
Please Don't Post Here - Red_Dragon - Mar 27, 2024 - 11:02am
 
Motivational Office Cliches... - NoEnzLefttoSplit - Mar 26, 2024 - 10:20pm
 
(Big) Media Watch - Red_Dragon - Mar 26, 2024 - 6:18pm
 
YouTube: Music-Videos - miamizsun - Mar 26, 2024 - 4:10pm
 
Israel - R_P - Mar 26, 2024 - 12:24pm
 
Photos you have taken of your walks or hikes. - Steely_D - Mar 26, 2024 - 12:04pm
 
Business as Usual - black321 - Mar 26, 2024 - 12:02pm
 
Solar / Wind / Geothermal / Efficiency Energy - islander - Mar 26, 2024 - 8:00am
 
Is there any DOG news out there? - Beez - Mar 26, 2024 - 7:24am
 
Food - Steely_D - Mar 26, 2024 - 1:41am
 
• • • The Once-a-Day • • •  - Red_Dragon - Mar 25, 2024 - 7:30pm
 
Vinyl Only Spin List - kurtster - Mar 25, 2024 - 6:56pm
 
Derplahoma! - Red_Dragon - Mar 25, 2024 - 3:48pm
 
Frequent drop outs (The Netherlands) - kingen - Mar 25, 2024 - 2:43pm
 
China - R_P - Mar 25, 2024 - 11:59am
 
Musky Mythology - R_P - Mar 25, 2024 - 11:20am
 
Play history seems to indicate that I"m streaming 24/7, b... - jarro - Mar 25, 2024 - 10:44am
 
April 8th Partial Solar Eclipse - Coaxial - Mar 24, 2024 - 6:22pm
 
New Music - KurtfromLaQuinta - Mar 24, 2024 - 5:07pm
 
Dental Floss Tycoons, and other Montana Myths, Facts, and... - Red_Dragon - Mar 24, 2024 - 12:32pm
 
Orbiting Earth - oldviolin - Mar 24, 2024 - 9:42am
 
Basketball - oldviolin - Mar 23, 2024 - 2:50pm
 
What Makes You Laugh? - ScottFromWyoming - Mar 23, 2024 - 1:54pm
 
Joe Biden - kurtster - Mar 23, 2024 - 11:17am
 
Technical Streaming Note for Nerdy RP DIYers - sjagminas1 - Mar 23, 2024 - 10:16am
 
Museum Of Bad Album Covers - Proclivities - Mar 23, 2024 - 8:56am
 
Other Medical Stuff - Antigone - Mar 22, 2024 - 3:06pm
 
Country Up The Bumpkin - oldviolin - Mar 22, 2024 - 11:06am
 
Pernicious Pious Proclivities Particularized Prodigiously - Red_Dragon - Mar 22, 2024 - 9:17am
 
Memorials - Remembering Our Loved Ones - Bill_J - Mar 21, 2024 - 8:54pm
 
Talk Behind Their Backs Forum - VV - Mar 21, 2024 - 2:29pm
 
Can you afford to retire? - DaveInSaoMiguel - Mar 21, 2024 - 2:15pm
 
Bug Reports & Feature Requests - blt - Mar 21, 2024 - 12:49pm
 
Mixtape Culture Club - KurtfromLaQuinta - Mar 21, 2024 - 11:10am
 
Baseball, anyone? - ScottFromWyoming - Mar 21, 2024 - 7:11am
 
What Did You See Today? - KurtfromLaQuinta - Mar 20, 2024 - 5:13pm
 
Annoying stuff. not things that piss you off, just annoyi... - ScottFromWyoming - Mar 20, 2024 - 4:31pm
 
Upcoming concerts or shows you can't wait to see - Antigone - Mar 20, 2024 - 3:10pm
 
Russia - NoEnzLefttoSplit - Mar 20, 2024 - 11:44am
 
Photography Forum - Your Own Photos - Proclivities - Mar 20, 2024 - 9:33am
 
2024 Elections! - Lazy8 - Mar 20, 2024 - 7:26am
 
Economix - R_P - Mar 19, 2024 - 4:36pm
 
Name My Band - DaveInSaoMiguel - Mar 19, 2024 - 10:53am
 
RP automation with iOS Shortcuts App - jarro - Mar 19, 2024 - 10:15am
 
Delicacies: a..k.a.. the Gross Food forum - DaveInSaoMiguel - Mar 19, 2024 - 10:12am
 
Irony 101 - Proclivities - Mar 19, 2024 - 6:02am
 
New Forum Member on "What Makes RP Great" - miamizsun - Mar 19, 2024 - 4:38am
 
Cache stopped working on old Android Phone - Eisenwindel - Mar 19, 2024 - 1:50am
 
Cryptic Posts - Leave Them Guessing - Bill_J - Mar 18, 2024 - 8:23pm
 
Damn Dinosaurs! - oldviolin - Mar 18, 2024 - 8:16pm
 
One Partying State - Wyoming News - geoff_morphini - Mar 18, 2024 - 3:58pm
 
Great guitar faces - skyguy - Mar 18, 2024 - 3:33pm
 
Despots, dictators and war criminals - R_P - Mar 18, 2024 - 12:41pm
 
Uploading Music - dischuckin - Mar 18, 2024 - 11:55am
 
Media Matters - thisbody - Mar 18, 2024 - 10:03am
 
NASA & other news from space - miamizsun - Mar 18, 2024 - 4:13am
 
MEALTICKET - drinpt - Mar 17, 2024 - 4:13am
 
What makes you smile? - Steely_D - Mar 16, 2024 - 7:31pm
 
Apple Computer - GeneP59 - Mar 16, 2024 - 12:02pm
 
Index » Regional/Local » USA/Canada » Earthquake in So. Cal Page: Previous  1, 2, 3, 4, 5, 6, 7, 8, 9
Post to this Topic
arsenault

arsenault Avatar

Location: long beach cali USandA
Gender: Male


Posted: May 18, 2009 - 1:57pm

 geoff_morphini wrote:

The seismogenic (deep) part of the fault is in older rocks (likely Tertiary seds or Mesozoic Franciscan Fm.-equivalent).  The people and houses are sitting on younger alluvium/marine seds that are poorly consolidated.  As for the causative fault, it appears, from first motion to be dominantly reverse with a lessor component of right-lateral strike-slip.  There are two choices for the fault plane shown on the beachball.  The likely one, based on past seismicity, is the plane dipping to the northeast.  If it turns out to be the southwest-dipping plane it will be a reverse fault with lessor left-lateral motion (unlikely).

This is all caused by the large left-stepping bend in the right-lateral strike-slip San Andreas fault.  That is why the Transverse Ranges formed and why there are so many blind thrusts in the LA basin (blind meaning, they typically don't rupture to the surface and display a scarp). 
 
are you a seismologist? that is pretty impressive.  {#Surprised}
geoff_morphini

geoff_morphini Avatar

Gender: Male


Posted: May 18, 2009 - 1:47pm

 NoEnzLefttoSplit wrote:
... but the fault itself is not in recent sedimentary deposits is it? (i'll have to rethink all my conceptions first), but in bedrock

and I thought the region was dominated by strike slip movement.. is the vertical moment something we could ignore or is it indicative of a more widespread graben type scenario... no wait a minute, it's a reverse fault, we're looking at compression and slip.. is that right?
 
The seismogenic (deep) part of the fault is in older rocks (likely Tertiary seds or Mesozoic Franciscan Fm.-equivalent).  The people and houses are sitting on younger alluvium/marine seds that are poorly consolidated.  As for the causative fault, it appears, from first motion to be dominantly reverse with a lessor component of right-lateral strike-slip.  There are two choices for the fault plane shown on the beachball.  The likely one, based on past seismicity, is the plane dipping to the northeast.  If it turns out to be the southwest-dipping plane it will be a reverse fault with lessor left-lateral motion (unlikely).

This is all caused by the large left-stepping bend in the right-lateral strike-slip San Andreas fault.  That is why the Transverse Ranges formed and why there are so many blind thrusts in the LA basin (blind meaning, they typically don't rupture to the surface and display a scarp). 

NoEnzLefttoSplit

NoEnzLefttoSplit Avatar

Gender: Male


Posted: May 18, 2009 - 1:24pm

... but the fault itself is not in recent sedimentary deposits is it? (i'll have to rethink all my conceptions first), but in bedrock

and I thought the region was dominated by strike slip movement.. is the vertical moment something we could ignore or is it indicative of a more widespread graben type scenario... no wait a minute, it's a reverse fault, we're looking at compression and slip.. is that right?

arsenault

arsenault Avatar

Location: long beach cali USandA
Gender: Male


Posted: May 18, 2009 - 1:21pm

 geoff_morphini wrote:

The computer generated intensity maps are always interesting.

This earthquake, while not very large, was shallow, in a sedimentary basin, and, from the first motion solutions, generated by a reverse fault (actually oblique - just for NoEndz).  These three things will contribute to higher accelerations and shaking.

If you are in the area you could do the scientific community a favor and go to: Did you feel it?  It is an anonymous questionnaire that asks for your zip code.  It is a short series of questions about whether you felt the quake, where you were located, what you were doing, etc.  This information is compiled to generate better computer-generated shake maps, like the one above.  The map above was generated almost instantaneously, by computer based on earthquake size, location and style.  Compare it to the one that is being developed as the 46,000+ respondents to the questionnaire respond.  You can see that the ground motion people are starting to get pretty good at estimating the shake from a real event.  Why is this of any use?  First-responders (fire, EMT, police, etc.) can look at the shake map and know where the greatest probability of damage might have occurred, quickly, and start to mobilize there rather than wait for information to trickle in.

 
thanks for that! i did feel it...and i will send in the questionnaire.

SantaFeGrace

SantaFeGrace Avatar

Location: Santa Fe, NM
Gender: Female


Posted: May 18, 2009 - 1:20pm

 KurtfromLaQuinta wrote:


Landers (about 40 miles north of us) in the early 90's was the gnarliest one.
A 7.2 that killed a small girl in Yucca Valley when a fireplace fell on her.
It ripped a scar in the earth up there a few miles long.
My parents thought there was a broken water main in their neighborhood because of all the water roaring down their street.
It was just water sloshing out of all the neighbors pools.
The next day followed  with a 6.7 in Big Bear!
Those were some tense days around here.
Especially with all the aftershocks.
 

Those two were enough to give me a scare in Orange County.  I will never forget the 6.3 Whitier-Narrows quake in 1987.  I was in Long Beach on a water table...sliding back & forth...and it happened to be the first major quake I have experienced!
geoff_morphini

geoff_morphini Avatar

Gender: Male


Posted: May 18, 2009 - 1:15pm

 KevinM wrote:

5.0 in Inglewood (Near Los Angeles)

LINK

 
The computer generated intensity maps are always interesting.



This earthquake, while not very large, was shallow, in a sedimentary basin, and, from the first motion solutions, generated by a reverse fault (actually oblique - just for NoEndz).  These three things will contribute to higher accelerations and shaking.

If you are in the area you could do the scientific community a favor and go to: Did you feel it?  It is an anonymous questionnaire that asks for your zip code.  It is a short series of questions about whether you felt the quake, where you were located, what you were doing, etc.  This information is compiled to generate better computer-generated shake maps, like the one above.  The map above was generated almost instantaneously, by computer based on earthquake size, location and style.  Compare it to the one that is being developed as the 46,000+ respondents to the questionnaire respond.  You can see that the ground motion people are starting to get pretty good at estimating the shake from a real event.  Why is this of any use?  First-responders (fire, EMT, police, etc.) can look at the shake map and know where the greatest probability of damage might have occurred, quickly, and start to mobilize there rather than wait for information to trickle in.



Here's the moment tensor solution (beachball):




PoundPuppy

PoundPuppy Avatar

Gender: Female


Posted: May 18, 2009 - 1:14pm

I hope no one was hurt.
KurtfromLaQuinta

KurtfromLaQuinta Avatar

Location: Really deep in the heart of South California
Gender: Male


Posted: May 18, 2009 - 1:12pm

 NoEnzLefttoSplit wrote:

sort of depends where you're sitting at the time.
 
I lived through some biggers.

Brawley (south of us here) had a couple of healthy ones in the 70's... 6.8's
One knocked down a few buildings there.
We felt them very well here.
They knocked the power out here for a short time.

We had a good sized one in the early 80's centered near Whitewater (10 miles noth of Palm Springs).
It was about a 6.2.
It knocked out our power again, for a short time.

Landers (about 40 miles north of us) in the early 90's was the gnarliest one.
A 7.2 that killed a small girl in Yucca Valley when a fireplace fell on her.
It ripped a scar in the earth up there a few miles long.
My parents thought there was a broken water main in their neighborhood because of all the water roaring down their street.
It was just water sloshing out of all the neighbors pools.
The next day followed  with a 6.7 in Big Bear!
Those were some tense days around here.
Especially with all the aftershocks.

Hector Mine (about 80 miles north of here) in the later 90's was a big one... around 6.8.
It derailed a passenger train outside of Barstow.

With this one in L.A., the media around here will be doing stories for months on the Big One we're going to have any day now.
 

NoEnzLefttoSplit

NoEnzLefttoSplit Avatar

Gender: Male


Posted: May 18, 2009 - 12:48pm

 KurtfromLaQuinta wrote:

Under 6.0.... Pfffffffffft!
 
sort of depends where you're sitting at the time.

KurtfromLaQuinta

KurtfromLaQuinta Avatar

Location: Really deep in the heart of South California
Gender: Male


Posted: May 18, 2009 - 12:43pm

 NoEnzLefttoSplit wrote:
right smack in the middle of town by the looks of it, but thankfully sub 5M.. must've been a pretty decent jolt. Any reports of damage? Sometimes local geography can amplify the effect of these things and the LA basin is meant to be one such place.

 
Under 6.0.... Pfffffffffft!

NoEnzLefttoSplit

NoEnzLefttoSplit Avatar

Gender: Male


Posted: May 18, 2009 - 12:38pm

right smack in the middle of town by the looks of it, but thankfully sub 5M.. must've been a pretty decent jolt. Any reports of damage? Sometimes local geography can amplify the effect of these things and the LA basin is meant to be one such place.
rachlan

rachlan Avatar

Location: nyc
Gender: Female


Posted: May 18, 2009 - 7:14am

 dmax wrote:

All three of them were only a mile or so from my mom's, but she's in Milwaukee right now, so I hope the house is ok....

 
after something like this, is she going to come back to stuff fallen down and maybe broken on the floor?  like spilled plants?   and you are worried about structural damage? or can it be just like she left it.

(former member)

(former member) Avatar

Gender: Male


Posted: May 18, 2009 - 7:06am

 KevinM wrote:

5.0 in Inglewood (Near Los Angeles)

LINK

 
All three of them were only a mile or so from my mom's, but she's in Milwaukee right now, so I hope the house is ok....
cookinlover

cookinlover Avatar

Location: Auckland, New Zealand (former Boston native and Atlanta transplant)
Gender: Male


Posted: May 17, 2009 - 9:23pm

 KevinM wrote:

5.0 in Inglewood (Near Los Angeles)

LINK

 
Was manxbird in the area at the time? 'Cause if he was...

KevinM

KevinM Avatar

Location: Long Beach, Ca
Gender: Male


Posted: May 17, 2009 - 9:20pm

 rachlan wrote:

did ya feel it?
 
Yep,

Pretty good jolt but no damage or frayed nerves.

rachlan

rachlan Avatar

Location: nyc
Gender: Female


Posted: May 17, 2009 - 9:18pm

 KevinM wrote:

5.0 in Inglewood (Near Los Angeles)

LINK

 
did ya feel it?

KevinM

KevinM Avatar

Location: Long Beach, Ca
Gender: Male


Posted: May 17, 2009 - 8:59pm


5.0 in Inglewood (Near Los Angeles)

LINK


Page: Previous  1, 2, 3, 4, 5, 6, 7, 8, 9