PSN-L Email List Message

Subject: Re: Seismic Signature of Tornadoes
From: "Randall Pratt" rpratt@.............
Date: Thu, 11 Apr 2013 10:42:39 -0500


Hi Tom,

=20

My thought would be that you will not see much from a tornado.  Nearly =
all
are =BD mile or less dia and moving 40mph or so at least in my vicinity. =
 That
leaves any specific area affected for only some seconds and from =
multiple
directions.  At the same time a much larger area is affected by heavy =
rain
or hail and yet a larger area will be affected by updrafts, downdrafts =
and
inflow, outflow from the storm.  These larger areas are present with or
without the tornado and are known to produce tilt from the passing =
front,
noise of trees in the wind, and rain noise on local instruments.  =
Detecting
a tornado would appear in my mind to require tracking an obscure point
source moving at a fairly high rate through a noisy background. =20

=20

As an experiment I would suggest setting up an array and attempting =
first to
track a large truck moving through the area from seismic noise.  Can you
identify and correlate with known positions?  Can you do the same with a
thunderstorm using radar positions? Can you separate if done together? =20

=20

Randy

=20












Hi Tom,

 

My thought would be that you will not see much from a tornado.=A0 Nearly all are =BD mile or less dia and moving 40mph or so = at least in my vicinity.=A0 That leaves any specific area affected for only some = seconds and from multiple directions.=A0 At the same time a much larger area is affected = by heavy rain or hail and yet a larger area will be affected by updrafts, = downdrafts and inflow, outflow from the storm.=A0 These larger areas are present with = or without the tornado and are known to produce tilt from the passing front, noise = of trees in the wind, and rain noise on local instruments.=A0 Detecting a = tornado would appear in my mind to require tracking an obscure point source = moving at a fairly high rate through a noisy background.=A0 =

 

As an experiment I would suggest setting up an array = and attempting first to track a large truck moving through the area from = seismic noise.=A0 Can you identify and correlate with known positions?=A0 Can = you do the same with a thunderstorm using radar positions? Can you separate if done together?=A0

 

Randy

 


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