PSN-L Email List Message

Subject: Re: Deep quakes like the one in the Phillippines
From: Dave Nelson dave.nelson@...............
Date: Mon, 05 Oct 2009 10:29:16 +1100

Thomas and Co
                            keep an eye on the quakes particularly in the 
New Zealand
to Tonga region (The Tonga Kermadec Trench) and you will regularly see events
 >600km in depth.   Some years back this same topic came up and I remember
commenting on the areas had I had done plots of depth V's locating and it was
a good personal study into subduction zones... the angle of the subducting slab
depths they were getting to etc.  Look for regions where the plate motions are
very high >6.5cm / year to show the regions of the deepest quakes.
   As I also mentioned that last time look at Alan Jone's software that 
plots all the
data for you in 3 dimensions  :)

Dave Nelson

At 11:43 AM 10/4/2009 -0400, you wrote:
>Thanks for pointing that out.  I should have noticed, considering the 
>almost complete absence of surface waves.  It gives a great opportunity, 
>though, to see all the body phases which are usually obscured by the big 
>surface stuff.  I'm pretty sure that's the deepest that we've seen.
>At 10:22 AM 10/4/2009 -0500, you wrote:
>>How many of you have gotten good copy on quakes deeper than this? Lay & 
>>Wallace indicate that 650 km and more is rare.


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