• Antelope Release 5.5 Mac OS X 10.8.5 2015-04-21

 

NAME

show_stalta - Plot STA, LTA and SNR of trace

SYNOPSIS

show_stalta db sta chan tstart tend
                filter sta_twin lta_twin SNR_thresh

SUPPORT


Contributed code: NO BRTT support.
THIS PIECE OF SOFTWARE WAS CONTRIBUTED BY THE ANTELOPE USER COMMUNITY. BRTT DISCLAIMS ALL OWNERSHIP, LIABILITY, AND SUPPORT FOR THIS PIECE OF SOFTWARE.

FOR HELP WITH THIS PIECE OF SOFTWARE, PLEASE CONTACT THE CONTRIBUTING AUTHOR.

DESCRIPTION

This program displays five traces on four separate plots. The first plot displays the raw waveform data for sta:chan in db between tstart and tend. The second plot displays waveform data filtered by filter. The third plot displays the short-term average (STA) and long-term average calculated using filtered data over respective time windows sta_twin and lta_twin. When the signal-to-noise-ration (SNR) exceeds SNR_thresh, the lta will be held constant until the SNR drops below SNR_thresh. The fourth plot displays the SNR, calculated using the sta and lta values displayed in the third plot.

dbdetect(1)

BUGS AND CAVEATS

The SNR calculated here is NOT calculated as STA / LTA.

AUTHOR

Malcolm White
mcwhite@ucsd.edu
February, 2013

Antelope User Group Contributed Software
Printer icon