La Secretaría de la Commonwealth

This following Matlab scripts on the attached disc were written and used to plot and analyse the seismic records of lahars:

trace yaxis.m This function is to convert the seismic amplitude axis of a trace into ground motion velocity (m/s).

seis true time.m This function is to set up the correct start time for a seismic file read into Matlab.

spectra analysis suzy 0903.m This function is to calculate a spectra for various

spectra analysis suzy 0902.m This function is to calculate amplitude and energy spectra of short signals, given an input signal “signal” with a length which is a power of 2. NB called by function spectra analysis suzy 0903.m

energy data extract.m This function is to extract seismic energy data from spectral analysis function answer file, for both a single lahar and any packets contained within.

Other programs used to analyse the seismic data were either contained within the ‘sac’ program available from Lawrence Livermore Laboratory or within MATLAB sig- nal processing tools, or were provided by my supervisor, Dr. Steve Sherburn, and are therefore the intellectual property of GNS Science.

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