PSN-L Email List Message
Subject: Re: Really low stuff
Date: Wed, 30 Sep 2009 01:21:26 -0000 (UTC)
You might have been seeing the earthquake wave second passing around the
This earthquake was big enough to go at least 2 - 3 times around the planet.
> Hi Jon,
> That's what I'm hoping someone knows more about than I do. I posted a gif
> image of what we were seeing at:
> The peak amplitude appears to be about 1um/s. Since at 180 seconds the 50
> sec. instrument response is down by a factor of roughly 13, the actual
> ground velocity must have been somewhere around 13um/sec implying a peak
> displacement of about 0.37 mm.
> At 12:44 AM 9/30/2009 +0000, you wrote:
>>What was the signal that you where seeing ?
>> > Hi all,
>> > As the Samoa quake was winding down, at about 23:04 UCT on the 50 sec
>> > vertical we see a very clear ~180 second signal that lasts for about
>> > an hour. On the Trillium 120 Z channel it's much bigger. What's
>> > on? Is that what I think it is?
>> > Brett
> Watch our wiggles
> or watch some very very good wiggles
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