PSN-L Email List Message

Subject: Re: Range of 4,5Hz geophone
From: ian ian@...........
Date: Sun, 08 Jan 2006 16:48:07 +0000


thanks for the links.  Interesting thought.  If the BGS was working I'd 
be able to check if it was real or local.  BGS sensors have been off 
since the 24th of December, outrageous and embarrassing.  Presumably 
Monday may bring some hope.  I'm tempted to email a complaint to them 
(it's my taxes!).



John or Jan Lahr wrote:

> Hi Ian,
> It's possible that the small event was triggered by the arriving 
> seismic waves, although this usually occurs later when the surface 
> waves are arriving.  See, for example, this page by USGS seismologist 
> Andy Michael:
> This has been observed in may volcanic and hydrothermal areas, where 
> presumable there are some "spots" that are so close to failure that 
> the added strain produced by the waves of a distant earthquake can set 
> some of them off.
> Andy's main page is:
> This "event" is more likely just the high frequency component of the P 
> wave.  It's hard to tell from the seismograms, but if it starts at 
> exactly the same time as P on the Lehman, then it's probably not a 
> triggered event.
> Cheers,
> John
> At 04:40 AM 1/8/2006, you wrote:
>> I'm getting an amazing trace on my Lehman of the Greek quake, still 
>> in progress.  Interestingly, there is a small event on my geophone 
>> which seems to co-incide with the P wave.  Is this likely?  See 
>> I'm just about to fit a permanent set of heaters in the box.  The 
>> temporary desk lamp has been great since I put it in, cured the 
>> problem completely.  I'll have to wait a bit now so as to not disturb 
>> the trace in progress....
>> Ian Smith
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