The surface faults have been discovered over the last two decades. Placing them all on one map will help educate the public and aid in planning and quake readiness.




April 28, 2010
By Hector Becerra
Los Angeles Times

More than 50 new surface earthquake faults have been discovered in California over the last two decades, according to a new state map that officials hope will help guide future development decisions and emergency planning.

The state's fault activity map, produced by the California Geological Survey, is the first in 16 years and offers a sober reminder of California's quake risks.

The new faults range from small ones that don't pose much threat for major temblors to very large ones, like that responsible for the 7.1 Hector Mine earthquake that shook Southern California in 1999.

Most of the faults have been known to researchers, and information on them is contained in scientific files. But state officials and quake experts hope that putting all the faults on one map will educate the state about quake risk zones and help residents grasp the geography of the fault lines.

"I think every classroom in California should have these maps on the wall," said Caltech seismologist Lucy Jones. "I don't think we do enough to educate the general public about these features. We turn it into something for the specialists, as if science is only for scientists. But if you're going to buy a house, would you like to know what fault is under your house?"

About 50 new faults might not seem like a lot in a state with thousands of them. But experts say the new maps point to a basic fact of seismology: The more scientists study quakes in California, the more faults — and dangers — they find.

"These maps are used to make a lot of other maps, to map landslides, areas where you have liquefaction because of earthquakes, for tsunami coastal mapping," state geologist John Parrish said. "They can be used to make decisions on where to build schools and hospitals, where you need a higher standard of construction. They can tell you what kind of a surface you're building on, and how close you are to a fault."

The release of the map comes amid an increased interest in quakes in California and beyond. Last month's 7.2 quake south of Mexicali produced thousands of aftershocks, including dozens registering above magnitude 4.0. As a result, officials said 2010 is shaping up to have significantly more quakes greater than 4.0 than any year in the last decade.

Parrish said the map represent the state's best efforts at compiling information on the faults across California and will hopefully be used to enhance earthquake preparedness.

With the new digital images as a base, The Times has produced its own map of Southern California's earthquake exposure, showing the potential magnitude of quakes. The Times map couples the surface faults on the state map with estimates in the 2007 Uniform California Earthquake Rupture Forecast, a study of the likelihood and probable magnitude of quakes.

Parrish and others stressed that residents should not necessarily be alarmed if they live or work near one of California's estimated 15,000 faults. Many of those are fairly short, and experts have found no evidence that they have generated sizable temblors.

But others can produce major quakes. Some of the new faults were discovered after a large quake erupted there. Scientists, however, found others through research and say they have a history of major seismic activity that could date back thousands of years.

The new faults are spread across the region and include some along Santa Monica Bay and the Orange County coast as well as some — including Hector Mine — in the Mojave Desert. One new fault of concern to seismologists is the Maacama, which runs along the coastal mountains of Northern California.


Parrish said one goal of the new maps was to make them easier for the public to understand. The map uses color-shaded relief to better show the paths of fault lines and contours of the geology around them.

"The 1994 map was very good for the time," he said. "But there's been a lot of mapping done in the intervening years, with more details here and there. New areas have been mapped, with new interpretations."

The map shows only surface faults; those below the surface, such as the one that caused the Northridge quake, are not included. The California Geological Survey also released a new geology map, identifying the composition of rock and soil across the state — key to how earthquakes inflict damage — for the first time since 1977.

Formed because of the Gold Rush, the office that became the survey was initially created to provide detailed information about mining. Despite numerous devastating earthquakes over the years, it wasn't until a 7.3 magnitude quake struck Kern County in 1952 and killed a dozen people that the office got involved in public safety.

The fault activity map is the fourth the state has released.

Wally Lieu, engineering section manager for the Metropolitan Water District of Southern California, said his agency is eager to review the new map. He said that the MWD already uses seismic maps in planning projects but that the state map provides additional useful information.

"Anything they have is of interest to us, especially in electronic form," Lieu said. "We have a mapping team in engineering, and they have responsibility for updating our maps as we collect information."

Parrish said the digital version of the new maps should be updated far more rapidly than in the past. If a new fault is discovered, it could be only months before its location is reflected electronically, he said.

hector.becerra@latimes.com

Times staff writer Doug Smith contributed to this report.

http://articles.latimes.com/2010/apr/28/local/la-me-california-faul...

Views: 655

Comment

You need to be a member of 12160 Social Network to add comments!

Join 12160 Social Network

Comment by Swtnlovabl on May 1, 2010 at 12:12am
From what I heard it was a COMPUTER ERROR lol Nothing more !!
Comment by truth on April 30, 2010 at 6:12pm
Magnitude 5 quake hits northern California http://bit.ly/d6X1f7

"Destroying the New World Order"

TOP CONTENT THIS WEEK

THANK YOU FOR SUPPORTING THE SITE!

mobile page

12160.info/m

12160 Administrators

 

Latest Activity

Less Prone favorited tjdavis's video
3 hours ago
Less Prone posted a photo

Social Engineering 101

That's how it goes.
3 hours ago
Doc Vega posted a blog post

A Prelude to WW III ? It Seems There We Are Trailblazing Idiocy into More Blood and Destruction!

They're rolling out the 25th Amendment trying to stop Joe Biden from insanely thrusting the US in a…See More
8 hours ago
Less Prone posted a video

Chris Langan - The Interview THEY Didn't Want You To See - CTMU [Full Version; Timestamps]

DW Description: Chris Langan is known to have the highest IQ in the world, somewhere between 195 and 210. To give you an idea of what this means, the average...
yesterday
Doc Vega posted a blog post

RFK Jr. Appoinment Rocks the World of the Federal Health Agncies and The Big Pharma Profits!

The Appointment by Trump as Secretary of HHS has sent shockwaves through the federal government…See More
Tuesday
tjdavis posted a video

Somewhere in California.

Tom Waites and Iggy Pop meet in a midnight diner in Jim Jarmusch's 2003 film Coffee and Cigarettes.
Tuesday
cheeki kea commented on cheeki kea's photo
Thumbnail

1 possible 1

"It's possible, but less likely. said the cat."
Monday
cheeki kea posted a photo
Monday
tjdavis posted a blog post
Monday
Tori Kovach commented on cheeki kea's photo
Thumbnail

You are wrong, all of you.

"BECAUSE TARIFFS WILL PUT MONEY IN YOUR POCKETS!"
Monday
Tori Kovach posted photos
Monday
Doc Vega posted a blog post

Whatever Happened?

Whatever Happened?  The unsung heroes will go about their dayRegardless of the welcome they've…See More
Sunday
Doc Vega commented on Doc Vega's blog post A Requiem for the Mass Corruption of the Federal Government
"cheeki kea Nice work! Thank you! "
Sunday
cheeki kea commented on Doc Vega's blog post A Requiem for the Mass Corruption of the Federal Government
"Chin up folks, once the low hanging fruit gets picked off a clearer view will reveal the higher…"
Sunday
Doc Vega's 4 blog posts were featured
Saturday
tjdavis's blog post was featured
Saturday
cheeki kea commented on cheeki kea's blog post Replicon Started in Tokyo October 08, 2024
"Your right LP it's insane for sure and hopefully improbable, keeping an open mind. Checking…"
Saturday
rlionhearted_3 commented on tjdavis's blog post Bill Gates Deleted Documentary
Saturday
rlionhearted_3 commented on tjdavis's blog post Bill Gates Deleted Documentary
"The white dude in the center is Bill Gates!!! "
Saturday
Less Prone favorited tjdavis's blog post Bill Gates Deleted Documentary
Nov 15

© 2024   Created by truth.   Powered by

Badges  |  Report an Issue  |  Terms of Service

content and site copyright 12160.info 2007-2019 - all rights reserved. unless otherwise noted