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Science Forum Index » Geology - Earthquakes Forum » New Madrid precusor yesterday?
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| rick++ |
 Posted: Fri Apr 18, 2008 3:34 am |
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Illinois M5.2 at north end of the New Madrid region.
(The seismic gurus are off in Santa Fe at the
Seismological Society of America annual convention.) |
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| Damon Hill |
| Posted: Fri Apr 18, 2008 5:55 pm |
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"rick++" <rick303@hotmail.com> wrote in news:6a897212-c38b-462e-b933-
1d028239ad01@y21g2000hsf.googlegroups.com:
Quote: Illinois M5.2 at north end of the New Madrid region.
(The seismic gurus are off in Santa Fe at the
Seismological Society of America annual convention.)
Doubtful, but interesting. There are occasional shakers in
that area of some strength. Don't know if the New Madrid events
of the early 1800s and current activity are really understood.
It's not on a plate boundry so far as I'm aware, but obviously
something's driving the activity.
--Damon |
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| Weatherlawyer |
| Posted: Sat Apr 19, 2008 7:09 am |
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On Apr 19, 3:00 pm, Jo Schaper <jo345sch765a...@s9ocket.net> wrote:
Quote: rick++ wrote:
Illinois M5.2 at north end of the New Madrid region.
(The seismic gurus are off in Santa Fe at the
Seismological Society of America annual convention.)
Actually, the quake was in the Wabash Valley Seismic Zone, not on the
New Madrid at all. Most of the larger midwestern quakes of the last 40
years have come from the Wabash Valley.
Slept through the 4:30 one, but was on board for the 10:14 4.6
aftershock. Pretty cool, because you could actually feel the various
waves sitting at my desk.
What were they doing there? |
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| Jo Schaper |
| Posted: Sat Apr 19, 2008 9:00 am |
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rick++ wrote:
Quote: Illinois M5.2 at north end of the New Madrid region.
(The seismic gurus are off in Santa Fe at the
Seismological Society of America annual convention.)
Actually, the quake was in the Wabash Valley Seismic Zone, not on the
New Madrid at all. Most of the larger midwestern quakes of the last 40
years have come from the Wabash Valley.
Slept through the 4:30 one, but was on board for the 10:14 4.6
aftershock. Pretty cool, because you could actually feel the various
waves sitting at my desk. |
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| Timberwoof |
| Posted: Sat Apr 19, 2008 1:31 pm |
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In article
<717e81db-b013-4152-8efd-051e70452efe@u69g2000hse.googlegroups.com>,
Weatherlawyer <Weatherlawyer@hotmail.com> wrote:
Quote: On Apr 19, 3:00 pm, Jo Schaper <jo345sch765a...@s9ocket.net> wrote:
rick++ wrote:
Illinois M5.2 at north end of the New Madrid region.
(The seismic gurus are off in Santa Fe at the
Seismological Society of America annual convention.)
Actually, the quake was in the Wabash Valley Seismic Zone, not on the
New Madrid at all. Most of the larger midwestern quakes of the last 40
years have come from the Wabash Valley.
Slept through the 4:30 one, but was on board for the 10:14 4.6
aftershock. Pretty cool, because you could actually feel the various
waves sitting at my desk.
What were they doing there?
Going OOoh and ahh over the USGS Recent Earthquakes page while Jo
entertained them with coffee and donuts. However, if a Wave were sitting
at my desk, I'd ask her politely to leave.
--
Timberwoof <me at timberwoof dot com> http://www.timberwoof.com
"When you post sewage, don't blame others for
emptying chamber pots in your direction." ‹Chris L. |
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| Weatherlawyer |
| Posted: Sat Apr 19, 2008 2:38 pm |
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On Apr 20, 1:12 am, Jo Schaper <jo345sch765a...@s9ocket.net> wrote:
Quote:
Then got an email from one of my editors asking if I'd
felt the first eq. I reported the second to them, and got an on the spot
assignment to do a shortie article on the event.
You aught to move to the Aleutians and get an advance on a book. |
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| Jo Schaper |
| Posted: Sat Apr 19, 2008 7:12 pm |
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Weatherlawyer wrote:
Quote: On Apr 19, 3:00 pm, Jo Schaper <jo345sch765a...@s9ocket.net> wrote:
rick++ wrote:
Illinois M5.2 at north end of the New Madrid region.
(The seismic gurus are off in Santa Fe at the
Seismological Society of America annual convention.)
Actually, the quake was in the Wabash Valley Seismic Zone, not on the
New Madrid at all. Most of the larger midwestern quakes of the last 40
years have come from the Wabash Valley.
Slept through the 4:30 one, but was on board for the 10:14 4.6
aftershock. Pretty cool, because you could actually feel the various
waves sitting at my desk.
What were they doing there?
I've mentioned here and sci.geo.geology that I live close to train
tracks, on one of the coal train mainlines Kansas City to St. Louis, so
rattling windows don't faze me. I was working on an article with a short
deadline when my swing-arm desk lamp started visibly swaying. I've got a
couple of 3x5 filecard boxes leaned up against the inner wall of the
house atop a bookcase. They started rattling against the wall. The floor
had some minor vibration. I looked up, and realized there weren't any
train noises outside, and the trains *never* rattle the inside hall
walls. I was aware of the earlier quake, so it took about 5 seconds and
I realized what was going on, and immediately thought,"Cool. Wonder how
this is going to turn out?" Since I knew there are sometimes precursor
shocks to large events and definitely aftershocks to a moderate quake, I
just sat there, watching the lamp shake. There definitely was the
initial onset, then a lessening of shaking and then a second wave of
intensity. Since I am about 125 miles from the epicenter (which I knew
from looking at the news earlier) I wasn't really alarmed, though I
wondered if this was an aftershock, or if something on the Wabash Valley
had kicked the New Madrid. By that time, it was over -- probably about
30-40 seconds of shaking from beginning to end. Dismissed it as an
aftershock.
Sent in a report to the USGS "did you feel it?" page. I was already on
the computer...
About 20 minutes later, I got a call from a state park employee I know
who was off-duty -- they have a seismic station at the park who wanted
to talk quakes. Then got an email from one of my editors asking if I'd
felt the first eq. I reported the second to them, and got an on the spot
assignment to do a shortie article on the event. |
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| Jo Schaper |
| Posted: Sun Apr 20, 2008 10:17 am |
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Weatherlawyer wrote:
Quote: On Apr 20, 1:12 am, Jo Schaper <jo345sch765a...@s9ocket.net> wrote:
Then got an email from one of my editors asking if I'd
felt the first eq. I reported the second to them, and got an on the spot
assignment to do a shortie article on the event.
You aught to move to the Aleutians and get an advance on a book.
ROTFL! |
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