It looks like about 54 micrometers peak Im guessing.
No wonder i felt sea sick.
Sort of like sea amd anchor detail through the
straights of juan de fuca.

Regards,
geoff

----- Original Message ----- 
From: "Bob Hancock" 
To: 
Sent: Saturday, October 18, 2008 11:17 PM
Subject: Re: 7.1 Tonga Quake


> Hi Geoff -
> 
> Use the following link to a USGS program and add the appropriate  
> information:
> 
> http://neic.usgs.gov/neis/travel_times/compute_tt.html
> 
> The answer you are looking for will be near the top of the page, prior  
> to the listing of the arrival times of the phases.
> 
> Cheers
> 
> Bob Hancock
> 
> 
> On Oct 18, 2008, at 11:01 PM, Geoff wrote:
> 
>> Gee Whillikers Guys, my system is only designed to get
>> 2Hz to 3 Second vertical (Z) waves but with this Tonga quake
>> a few minutes ago Im getting 20 second surface waves
>> they must be really large since my system is relatively
>> insensitive at these periods. Can someone give me an
>> idea of the actual peak ground deflection from this
>> 7.1 Tonga Quake at 20 seconds period surface waves and 81 degrees  
>> away ?
>> I do not know how to do this myself.
>> regards
>> geoff
>>
>>
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