Geof might have a point ... I'm NOT going t o be the one, but someone 
should maybe say something if the files aren't any good ... a long time 
ago I was cutting off some waveforms after the LR. I was doing it to cut 
down the size of my file and didn't think the data was that important 
from my amateur equipment..it was maybe six weeks before I understood 
what I was but it halped

Geoffrey wrote:
> 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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