C. Patton, A. Hrubetz, & J. Lahr--your copies of the short period design =
are in the mail. =20
   I need some help on mailing addresses for S. Hammond, L. Conklin & F. =
Cooper---
    Thanks Chris for your comments on geophones.  I remember showing the =
short period vertical design to a geophysicist who had considerable =
experience in exploration using geophones.  He said--"Why not use a =
geophone?"  We got hold of several used discards in good condition and =
tried them.  They  are "strong motion" in nature, but with todays =
amplification one can adapt.  The units we had were periods less than a =
1 second, and were underdamped for our purposes.  We wanted parameters =
to match the 1 second vertical Springnether (sp) professional sensor the =
Geology Dept. was using at that time--for comparison purposes.  We never =
pursued the idea further--but felt it had possibilities.
     No doubt there are persons out there like Chris that have had some =
experience with geophones.  They are compact--a neat package and =
reasonably economical--a quick way to go vertical-- if you can adapt the =
parameters to be within the wishes of an amateur seismologist.
                                                                Season's =
Best---Jim Lehman

                                                                         =
     =20







C. Patton, A. =
Hrubetz, & J.=20
Lahr--your copies of the short period design are in the mail. =20

   I need =
some help on=20
mailing addresses for S. Hammond, L. Conklin & F. =
Cooper---
    =
Thanks Chris=20
for your comments on geophones.  I remember showing the short =
period=20
vertical design to a geophysicist who had considerable experience in =
exploration=20
using geophones.  He said--"Why not use a geophone?"  We got =
hold of=20
several used discards in good condition and tried them.  They  =
are=20
"strong motion" in nature, but with todays amplification one can =
adapt. =20
The units we had were periods less than a 1 second, and were underdamped =
for our=20
purposes.  We wanted parameters to match the 1 second vertical =
Springnether=20
(sp) professional sensor the Geology Dept. was using at that time--for=20
comparison purposes.  We never pursued the idea further--but felt =
it had=20
possibilities.
     No doubt=20
there are persons out there like Chris that have had some experience =
with=20
geophones.  They are compact--a neat package and reasonably =
economical--a=20
quick way to go vertical-- if you can adapt the parameters to be within =
the=20
wishes of an amateur seismologist.
          &nbs=
p;            =
;            =
            &=
nbsp;           &n=
bsp;   =20
Season's Best---Jim Lehman
 
          &nbs=
p;            =
;            =
            &=
nbsp;           &n=
bsp;           &nb=
sp;      =20