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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