Jerry,
That was my first thought, too.  If we were to hold the device so that =
the dowel rods were vertical, then it would be close to a Love Wave.  =
However, a Love wave attenuates quickly with depth.  So the movement =
should be much less on the bottom.  But John made the connections in the =
exact center of the dowel rods so that the movement is identical on the =
bottom as the top, which would not make it a good representation of a =
Love wave. =20
Am I wrong?
Kay

  ----- Original Message -----=20
  From: GPayton=20
  To: psnlist@.................
  Sent: Wednesday, September 08, 2010 7:17 PM
  Subject: Re: Question about John Lahr's work


  Kay I "think" it may be a demo of a LOVE Wave.  See the animations: =20
  http://www.tjhsst.edu/~jlafever/wanimate/Wave_Properties2.html

  Jerry
    ----- Original Message -----=20
    From: Kay Wyatt=20
    To: psnlist@.................
    Sent: Wednesday, September 08, 2010 5:57 PM
    Subject: Question about John Lahr's work


    Dear friends,

    John Lahr's wife, Jan, gave me much of John's earthscience =
activities and=20
    experiements.  I'm familiar with most of them, but there is one in=20
    particular that I could use some help on.  I have posted some =
pictures at=20
    http://www.oregonshakes.com/temp/Lahr/ for your review.

    The device appears to be a torsion wave generator but I'm not =
familiar with=20
    torsion waves generated by earthquakes (which was John's primary =
focus).=20
    Could this be something else related to earthquakes?

    Be sure to look at the move link on the website so that you can see =
it in=20
    action.
    http://www.oregonshakes.com/temp/Lahr/MOV04260a.MPG

    If any of you have ideas, please let me know.

    Thanks so much,
    Kay Wyatt


    __________________________________________________________

    Public Seismic Network Mailing List (PSNLIST)

    To leave this list email PSNLIST-REQUEST@.............. with=20
    the body of the message (first line only): unsubscribe
    See http://www.seismicnet.com/maillist.html for more information.







Jerry,
That was my first thought, too.  If we were =
to hold=20
the device so that the dowel rods were vertical, then it would be close =
to a=20
Love Wave.  However, a Love wave attenuates quickly with =
depth.  So=20
the movement should be much less on the bottom.  But John made the=20
connections in the exact center of the dowel rods so that the movement =
is=20
identical on the bottom as the top, which would not make it a good=20
representation of a Love wave.  
Am I wrong?
Kay
 

  
----- Original Message ----- 
  From:=20
  GPayton=20
  
  
To: psnlist@.............. =

  
Sent: Wednesday, September 08, =
2010 7:17=20
  PM
  
Subject: Re: Question about =
John Lahr's=20
  work
  


  
Kay I "think" it may be a demo of a LOVE Wave.  See the =

  animations:  
  
h=
ttp://www.tjhsst.edu/~jlafever/wanimate/Wave_Properties2.html
  
 
  
Jerry
  
    
----- Original Message ----- 
    From:=20
    Kay=20
    Wyatt 
    
To: psnlist@.............. =

    
Sent: Wednesday, September =
08, 2010=20
    5:57 PM
    
Subject: Question about John =
Lahr's=20
    work
    

Dear friends,

John Lahr's wife, Jan, gave me =
much of=20
    John's earthscience activities and 
experiements.  I'm =
familiar with=20
    most of them, but there is one in 
particular that I could use =
some help=20
    on.  I have posted some pictures at 
http://www.oregonshakes.c=
om/temp/Lahr/=20
    for your review.

The device appears to be a torsion wave =
generator=20
    but I'm not familiar with 
torsion waves generated by earthquakes =
(which=20
    was John's primary focus). 
Could this be something else related =
to=20
    earthquakes?

Be sure to look at the move link on the website =
so that=20
    you can see it in 
action.
http://www.o=
regonshakes.com/temp/Lahr/MOV04260a.MPG

If=20
    any of you have ideas, please let me know.

Thanks so =
much,
Kay=20
    =
Wyatt


________________________________________________________=
__

Public=20
    Seismic Network Mailing List (PSNLIST)

To leave this list =
email PSNLIST-REQUEST@SEISMICNET=
..COM=20
    with 
the body of the message (first line only): =
unsubscribe
See http://www.seismicnet.co=
m/maillist.html=20
    for more information.