PSN-L Email List Message
Subject: Many Nevada aftershock
From: tchannel1@............
Date: Fri, 22 Feb 2008 21:47:47 -0700
Hi Folks, We have been recording many aftershocks following the 6.0M =
Nevada Feb. 21st. Several in the 4's and many more 3's.
I have not been counting the 3's but around 6 events in 24 hours? I =
just looked a the last three events from this area, 3.2M, 3.1M, and 3.2M =
in the last few hours.
These are about 160 miles or 310km, and the 3's are coming through very =
well defined. If these were not so numerous I would be posting each and =
every one.=20
With my equipment I rarely record events this small and this numerous. =
Too many earthquakes to process ! =20
If I were to process all the ones I am recording from this area, I =
would be processing 24hours a day.
I am recording with two different sensors. One is a Slinky II, which =
works very well, but even better , the latest one, I am calling a Tilt =
Meter, which is a very simple 2 second pendulum, hanging down like a =
Grandfather Clock. It contains a nice coil, 4000 turns and 4 magnets, =
nice, but nothing complex.
At any rate this machine is working better than any of my other 10 =
efforts.
If someone is serious about building an inexpensive, but effective =
sensor, contact me and I will share my pictures and design notes. I =
think the reason it is working so well is the special coil and the fact =
that it uses a simple tilt. I am posting these as TCIDTM.
Meanwhile, The school, TVMSC is recording away, using the small copper =
vertical sensor, and it is working well for them. They also are =
recording many of the 3's aftershock. They sure were happy to see the =
6.0M The school had two TV channels come out and interview the 8th =
graders. I was there and and sure was smiling. The reporters ask =
several of the kids if they felt it, and each told an account. One =
boy, said "Well there I was, just eating my oatmeal, and I felt the =
table shake" Another one said "It knotted my cat out of the chair"
Perhaps I could get some of the kids to write their experience, and post =
them here? I will ask their teacher Ms. Poppenga.
Cheers
Hi Folks, We have been recording =
many=20
aftershocks following the 6.0M Nevada Feb. 21st. Several in the =
4's and=20
many more 3's.
I have not been counting the 3's but =
around 6=20
events in 24 hours? I just looked a the last three events =
from this=20
area, 3.2M, 3.1M, and 3.2M in the last few hours.
These are about 160 miles or 310km, and =
the 3's are=20
coming through very well defined. If these were not so =
numerous I=20
would be posting each and every one.
With my equipment I rarely record =
events this small=20
and this numerous. Too many earthquakes to process=20
!
If I were to process all the ones =
I am=20
recording from this area, I would be processing 24hours a =
day.
I am recording with two different =
sensors. =20
One is a Slinky II, which works very well, but even better , the latest=20
one, I am calling a Tilt Meter, which is a very simple 2 =
second=20
pendulum, hanging down like a Grandfather Clock. It contains a =
nice coil,=20
4000 turns and 4 magnets, nice, but nothing complex.
At any rate this machine is working =
better than any=20
of my other 10 efforts.
If someone is serious about building an =
inexpensive, but effective sensor, contact me and I will share my =
pictures and=20
design notes. I think the reason it is working so well is =
the=20
special coil and the fact that it uses a simple tilt. I am =
posting=20
these as TCIDTM.
Meanwhile, The school, TVMSC is =
recording=20
away, using the small copper vertical sensor, and it is working well for =
them. They also are recording many of the 3's=20
aftershock. They sure were happy to see the =
6.0M =20
The school had two TV channels come out and interview the 8th=20
graders. I was there and and sure was smiling. =
The=20
reporters ask several of the kids if they felt it, and each told an=20
account. One boy, said "Well there I was, just eating my =
oatmeal,=20
and I felt the table shake" Another one said "It =
knotted my=20
cat out of the chair"
Perhaps I could get some of the kids to =
write their=20
experience, and post them here? I will ask their =
teacher Ms.=20
Poppenga.
Cheers
Ted
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