Newsgroup sci.geo.earthquakes 6082

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HAL>From: Harold and Lise 
   >Subject: Sacramento
HAL>A serious question from me for once. :)  In my little blurbs here and on
   >comp.risk, I was making fun of an earthquake insurance agency that sits
   >on the fault it insures.  In fact, I think it should locate in Chicago!
HAL>However, several people have written back that it would be perfectly
   >fine in Sacramento.  In fact, many agencies are locating there because
   >it is "fault free" according to the maps.  Now, I look at the maps and
   >see that S. is being heavily sheared by San Andreas motion and might not
   >be that 'safe'.  Does anybody have the strain rate of this area, or a
   >recent seismic hazard evaluation?  It seems silly to concentrate every
   >relief computer in the state there.
The San Andreas is about 100 miles west of Sacramento. Sacramento is
less likely to experience a damaging earthquake than San Francisco or
Los Angeles. To see the latest info regarding California's earthquake
risk, link to http://www.consrv.ca.gov/dmg and check out the draft
Probabilistic Seismic Hazard Map (scheduled for release in
mid-December).
As for "Relief computers," the State Office of Emergency Services is our
primary disaster response agency. Their state headquarters is located in
Sacramento, and their Southern California regional office is located in
Pasadena. They also have smaller offices located elsewhere in the state.
  -- Ted
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 * QMPro 1.52 * Just when one is caught up, everything speeds up!

Are all the quakes around the Salton Sea and surrounding area normal? It
seems to me that the EQs are on the increase and getting stronger.
What is the thought about related strain in other areas (LA or San
Bernidino) is it increasing or decreasing?
And my last question is are the quakes in the desert compressing or
compacting?

In article <01bbd195$b449fa60$286062ce@david-lawler>,
  wrote:
>Are all the quakes around the Salton Sea and surrounding area normal? It
>seems to me that the EQs are on the increase and getting stronger.
The Salton Sea lies between two "branches" of the San Andreas Fault.
There have been quite a few strong earthquakes here over the years.
It's also why there are hot mud springs on the east side of the sea.
>What is the thought about related strain in other areas (LA or San
>Bernidino) is it increasing or decreasing?
>
>And my last question is are the quakes in the desert compressing or
>compacting?
The entire Salton Sink/Imperial Valley is an extension of the Gulf of
California, consisting of the delta of the Colorado River's ancient
route. The Gulf of California is spreading, with Baja California and
the mainland moving away from each other. Since Baja is on teh Pacific
Plate, and headed for Alaska, obviously San Andreas and other quakes
near San Berdoo and LA are related.
-- 
    ********** DAVE HATUNEN (hatunen@netcom.com) **********
    *               Daly City California                  *
    *   Between San Francisco and South San Francisco     *
    *******************************************************

I just got your final final issue, Vince, and I am sorry to see the demise
of GeoMonitor, as there is a continuing need for a nuts and bolts approach
to earthquake prediction.  You barely outlasted one of your mainstays, Ray
Cole, for whom I had great admiration.
My newsletter, SYZYGY, will continue until my demise (or incapacitation)
and I am looking for another productive 20 years. I also quote the
literature, expound about my tidal and animal precursors to quakes, and
make monthly "Seismic Windows" of eight days.   But I seldom get into
hardware.
For anyone interested in my own newsletter, send a SASE to Jim Berkland,
14927 East Hills Drive, San Jose, CA  95127;   Or  what the heck, just go
right ahead and send me a check for $40 for 12 monthly issues.  (Actually,
this is "bakers dozen" month, when you get 13 issues for the same price
with a postmark no later than Nov. 30, 1996.)   

Ted Smith wrote: 
> The San Andreas is about 100 miles west of Sacramento. Sacramento is
> less likely to experience a damaging earthquake than San Francisco or
> Los Angeles. To see the latest info regarding California's earthquake
> risk, link to http://www.consrv.ca.gov/dmg and check out the draft
> Probabilistic Seismic Hazard Map (scheduled for release in
> mid-December).
Thanks, that's a great map (should mark major cities). The hazard is
still about 20%g at the 500yr level (high, by my Toronto standards!) I
wonder if the central basin is really that inactive.
Things that would give me a :( about Sacramento
- there's only a big earthquake there every 300 years and the last one
was 300 years ago.
- building codes are slack because there are no earthquakes there.
-monitoring is slack because of no earthquakes.
-the strain rate is only slightly less than elsewhere
-hydraulic fill dams
-the whole place is on a jello basin.
Things that would rate a :)
-there's been intensive seismic monitoring and they found nothing.
-it really is a piece of massive continental rock, completely isolated
by weak fault zones.
-strain rate is orders of magnitude less.
-building codes are strict
-it's on firm rock.
I really haven't seen anything in the literature about the area, so I
could tell which is which.
Harold Asmis (at home)

Earthquakes CAUSE liquefaction, landslides, tsunami, lurching, subsidence,
and a number of other GEOLOGIC phenomena.---by JOB

I'm in Hualien, Taiwan.  I just felt quite a jolt that lasted about 15
sedonds, and a few pictures fell off the walls.  However, minor
earthquakes like this are so common here that they're not even reported in
the press.  Is there a web address where I can find out the details of
this earthquake.  I tried http://www.geophys.washington.edu/, but they
only had data about earthquakes in Oregon and Washington. 
(I felt it at 9:40 am local time, which is 0140 UTC, on November 14th.)
Mark

In article <3288F591.516A@prodigy.net>, DODAH   wrote:
>Yes,  I'd say its active, Grew up in Portland and recall some in the
>early 50's or late 40's.  Portland is also about the only city in this
>country, outside of Hawaii that has a Volcanoe inside the city limits..
The aeromagnetic maps that Rick Blakeley showed off at the last
USGS open house in Menlo Park showed what he interpreted as shallow
volcanic features that underlie the whole city.  He also pointed
out two throughgoing north-south trending faults that were supposedly
not previously known.
A number of scientists have suggested that major earthquakes in the
Pacific Northwest are less common but probably more powerful than
the ones we've seen in California.  As always, risk assessment must
include both the likelihood that an undesirable event will take place
and the severity of the consequences if it does.
-- 
    Chuck Karish          karish@mindcraft.com
    (415) 323-9000 x117   karish@pangea.stanford.edu

THE DEATH OF AN IMPORTANT PERSON  11/14/96
The following is intended to be a simple notification.  It is not
meant for discussion.  It also represents an expression of
personal opinion
Surrounding us all is a form of energy which our thoughts can
influence and which in turn can influence our thoughts.  It is
neither good nor evil.  But it can at times exert a powerful
force on world events and help propel them towards good or evil.
Around the world there are important people who are able to exert
an especially strong direct influence on that force.  And they
often influence it indirectly as a result of their interactions
with other people.  They provide us all with a safety net which
allows us to occasionally make mistakes and not suffer unduly.
One of those important people, Joseph Cardinal Bernardin,
spiritual leader for millions of followers of the Roman Catholic
religion in Chicago, Illinois, USA has just passed away quietly
and peacefully at his residence in Chicago.
E.D.G.,  Scientific Consultant