Geoff,
            not, its not the same wave doing a double trip around the world
When the waves radiate out from the quake they go in all directions. The 
first set
of surface waves you saw straight after your P and S waves were the ones that
travelled the short path across the Pacific directly to you.
   The second small set of waves you saw ~ 2 hrs later were the ones that were
travelling out from the quake epicentre in the other direction and had a 
very much
longer path to you and hence took much longer to arrive at your location.

  This showed up clearly on Steve's system as well as on the big USGS network
where you could see the waves coming from one direction and then again from 
the
other direction.  It was pretty cool to watch

I havent heard anyone else comment, as yet, that they also recorded the second
arrival of Surface waves, but I suspect that if they looked at their 
recordings they
may well see them

Dave


At 03:20 PM 10/03/2012 +0000, you wrote:
>I guess you have just prooven me false.
>But in any case, i have been looking at
>waves a very long time and never knew i saw
>a surface wave twice around the globe before.
>Could this EQ have been more energetic
>than it was designated by the usgs ?
>
>----- Original Message ----- From: "Dave Nelson" 
>To: 
>Sent: Saturday, March 10, 2012 2:24 AM
>Subject: Re: later arrival of waves
>
>
>>Hi Geoff
>>  I didnt think much of this at the time. It was only after Steve Jones's 
>> comments
>>on his facebook page that I reconsidered your comments.  Steve clearly 
>>recorded
>>a second arrival of Surface Waves ( not S waves) that had travelled from the
>>epicentre and around the world in the other direction and arrived ~ 1 hr 
>>after the
>>first surface waves arrived. They passed by Steve's station before 
>>travelling further
>>west to your location
>>So I suspect what you saw was the same thing... those surface waves not
>>S waves  :)
>>cheers
>>Dave
>>
>>At 10:14 AM 9/03/2012 +0000, you wrote:
>>>I seemed to have received a second trane of S waves
>>>two hours after receiving the P wave.
>>>
>>>Can this be true ?
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