PSN-L Email List Message

Subject: Re: "S" Shear Waves and Water bodies Like Lakes
From: Dave Nelson dave.nelson@...............
Date: Tue, 03 Apr 2012 06:46:03 +1000


Hi Geoff

  If you are sitting in on a lake or other body of water, you will NOT feel 
the
shear (S) waves. You WILL feel the pulse of the P wave as it passes through.
There's been a couple of incidences in New Zealand some years back, '80's
and '90's, of guys in boats both on lakes or at sea close to the shoreline 
( within
a few 100 metres or so) They both described the passage of the P wave as a thud
as tho the boat had run aground. They didnt feel the shaking of the S waves.
They were also within ~ 100 km (60miles) of the epicentre. One quake was a
hi M6, the other was a low M7

cheers
Dave N

At 04:52 PM 2/04/2012 +0000, you wrote:
>Hello PSN;
>Looking for comments here:
>When a body of water such as a lake is hit by shear waves
>does anyone know for sure what will happen ?
>Like,
>Do water waves form at the perimiter and converge at the center.
>Like, since, S waves do not travel through liquids of any kind ?
>Has there ever been witnesses to such a thing ?
>I was just laying here as I woke from sleep
>thinking about this.
>
>When I looked at an EQ in three dimensions using a computer
>program I saw a kind of orbital motion of the ground about
>the mass and no clear cut steady wave like activity.
>
>Regards,
>geoff

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