Sample recordings from the HA01 Leeuwin and and HA08 Diego Garcia hydrophone triads have been provided by an undisclosed source. I am most grateful to this source, but will not name them because of all the restrictions the CTBTO places on their contractors. This is not leaked data, just obtained through other seismic monitoring networks. I am still hopeful that the CTBTO will revise its policies to allow independent contractors access to the data archives. There are unexplored details in the infrasound from Mar 8, plus hydrophone data from later times and other stations that could confirm or reject unresolved signals.
I’m using Octave (a open source Matlab clone) for converting the dataset and signal processing, and already have spectrograms plotted. This is a very rich sampling of data, with new candidate events already in the queue!