I wouldn't spend any time running the data from the CNI sensor through Bob's inverse 
filter. This channel is recorded using analog telemetry through a VHF police scanner, 
so the dynamic range (< 12 A/D Bits) is very limited.

Regards,
Larry Cochrane
Redwood City, PSN

On 3/13/2011 1:32 PM, Stephen Hammond wrote:
> Hi Bob, Did you happen to see this in the Larry's Redwood City PSN
> datasets? If I remember correctly, Niles Canyon is local near Larry's
> Redwood City location and is a USGS geophone up in the hills. The data
> is impressive.  Regards, Steve Hammond PSN San Jose, Aptos CA.
>
> 110311.054624.cni.psn
>    M8.9 7974km
> from Niles Canyon, CA USA, NEAR THE EAST COAST OF HONSHU, JAPAN (GIF
>  .psn>  Image)
>
>
>
> -----Original Message-----
> From: psnlist-request@..............
> [mailto:psnlist-request@............... On Behalf Of Bob McClure
> Sent: Sunday, March 13, 2011 1:10 PM
> To: psnlist@..............
> Subject: Inverse filtering example
>
>
>    I use inverse filtering to restore long-period response to my medium
> period sensors. On major events, even geophones can be transformed into
> long-period sensors.
>
>    For example, I downloaded the following files:
>
> 110311.054500.sobe.psn
>    Mw8.9
> 8750km from Sonderborg, Denmark, Near East Coast of Eastern Honshu,
> Japan (GIF
>  0.sobe.psn>  Image)
> 110311.054500.sobn.psn
>    Mw8.9
> 8750km from Sonderborg, Denmark, Near East Coast of Eastern Honshu,
> Japan (GIF
>  0.sobn.psn>  Image)
> 110311.054500.sobz.psn
>    Mw8.9
> 8750km from Sonderborg, Denmark, Near East Coast of Eastern Honshu,
> Japan (GIF
>  0.sobz.psn>  Image)
>
>    I inverse filtered from the original period of 0.22 seconds to 20
> seconds and posted the following volume file:
>
> 110311.055500.sobx.psn
>    * M8.9
> 8750km from Sonderborg, Denmark [Inverse Filtered], Near East Coast of
> Eastern Honshu, Japan (GIF
>  0.sobx.psn>  Image)
>
> which can be looked at or downloaded from
> http://www.seismicnet.com/cgi-dos/event.exe
>
>    If you integrate the data, you get peak displacements in the 3 to 4 mm
> range, which seems about right.
>
>    My inverse filter utility program, WQFilter.exe, can be downloaded
> from http://sites.google.com/site/bobmcclure90
>
> Bob
>
>
>
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