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
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 :)
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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