PSN-L Email List Message

Subject: Re: 7.1 Tonga Quake
From: Bob Hancock carpediem1@.........
Date: Sat, 18 Oct 2008 23:17:54 -0700

Hi Geoff -

Use the following link to a USGS program and add the appropriate  

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.


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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