PSN-L Email List Message

Subject: Re: LISS calibration
From: "Geoffrey" gmvoeth@...........
Date: Tue, 21 Sep 2010 00:31:38 +0000


I have seen this for quite some time and agree
it's a good idea.

You need some instrumentation people look at these and tell
the station operators they are in need of servicing their stations
or taking them offline.

There are some stations which seem to be producing
meaningless results swamped with unknown artifacts.

Id say if your doing maintenance you take your system offline
till it works right.

I have found in training most people care nothing about
anything but getting a grade. The thought here is just who is
operating some of these stations ?

I too have used these stations in the past to find possible but unknown signals.


Thoughts ?



--------------------------------------------------
From: "Brett Nordgren" 
Sent: Monday, September 20, 2010 8:10 PM
To: 
Subject: LISS calibration

> Hi All,
> 
> I recently obtained the calibration for the LISS helicorder displays 
> which are to be found at   http://www.liss.org/    From there you can 
> go see US stations on the ANSS or stations world-wide on the GSN.
> 
> According to Bob Hutt of the USGS/ASL the displays are set up to have 
> a velocity response of 333 nanometers per second per line, with a 
> bandpass from 360 seconds to 20 seconds.  That long-period filtering 
> mainly shows surface waves from relatively distant events, pretty 
> much eliminating high frequency local quakes and the higher frequency 
> phases of teleseisms.
> 
> We have on occasion been able to use the LISS to confirm the 
> existence of events which we had seen but which weren't appearing in 
> the USGS' "Latest Earthquakes" lists.
> 
> Regards,
> Brett
> 
> 
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