Hi Chris,

 

I have now read the link.  Thanks for steering me. 

 

Their comment, "The seismograms show a strong, low-frequency pulse beginning
[before the tornado's touchdown] 
around 4:45 a.m. on February 29.  Our preliminary interpretation, based on
other seismic records of tornadoes, suggests 
that we were recording not the tornado itself, but a large atmospheric
pressure transient related to the 
large thunderstorms that spawned the tornadoes."   This is in line with my
thoughts.  The tornado is a very small portion of the total energy of the
storm.  Many times downflows causing microbursts do more local damage than
tornados.  I don't think looking at a few known tornado records and noting
noise changes can be used as evidence.  I would need to see specifics of how
these records are different from a severe storm with no tornado on the same
instruments and area.  

 

I will volunteer to increase my sample rate and listen to some storms and
tornados over the next few months.  May and June generally give me more
opportunity than I desire.   Unfortunately Earthscope has moved on from my
area.  I have SUSD to the NW and ECSD about 80 miles east of me so spacing
is rather large.  

 

Randy

 














Hi Chris,

 

I have now read the link.  Thanks for steering =
me. 

 

Their comment, “The seismograms show a strong,
low-frequency pulse beginning [before the tornado’s touchdown] =


around 4:45 a.m. on February 29.  Our preliminary interpretation, =
based on
other seismic records of tornadoes, suggests 

that we were recording not the tornado itself, but a large atmospheric =
pressure
transient related to the 

large thunderstorms that spawned the tornadoes.”  =
 This
is in line with my thoughts.  The tornado is a very small portion =
of the
total energy of the storm.  Many times downflows causing =
microbursts do
more local damage than tornados.  I don’t think looking at a =
few
known tornado records and noting noise changes can be used as =
evidence.  I
would need to see specifics of how these records are different from a =
severe
storm with no tornado on the same instruments and area.  =


 

I will volunteer to increase my sample rate and =
listen to
some storms and tornados over the next few months.  May and June =
generally
give me more opportunity than I desire.   Unfortunately =
Earthscope
has moved on from my area.  I have SUSD to the NW and ECSD about 80 =
miles
east of me so spacing is rather large.  =


 

Randy