PSN-L Email List Message
Subject: waterfall plot of infrasound data files?
From: "David Saum" DSaum@............
Date: Thu, 18 Jun 2009 15:37:31 -0400
I am using Amaseis to record infrasound data
(sound below 20 Hz) and I would like to plot
my data to display dopper shifts.
My infrasound receiver is a few miles from
the Pentagon and I seem to be in the flight
path between the Pentagon and Quantico.
Every day I pick up helicopter noise in the
10 to 20 Hz band. There seems to be
a nice dopper shift that I have not figured
out how to display with seismic software.
Here is a typical SAC data file from a
helicopter overflight this morning:
The fundamental shifts from ~12.5 Hz as it
approaches, to ~9.5 Hz as it leaves.
Can anyone suggest software to plot this data
to display the dopper shift? Perhaps a stacked
3D spectra-time plot, or a 2D waterfall of
frequency vs time? Of course I can generate
any of the Amaseis file formats or any of the
WinQuake formats as program inputs.
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