Processing of volcano infrasound using film sound audio post-production techniques to improve signal detection via array processing

Geoscience Letters

Official Journal of the Asia Oceania Geosciences Society (AOGS)

Table 2 Modified results from the CTBTO Reference Event Bulletin (REB) for the Sangeang Api eruption

Station	Distance (°)	Observed arrival time (UTC)	Back azimuth observed	Azimuth residual	Slowness/celerity (m/s)
I07AU	18.41	09:38:55.675	303.5	− 5.3	313.4
I39PW	21.10	10:10:00.000	219.8	− 4.2	288.8
I06AU	23.16	10:22:07.962	79.6	− 1.9	176
I04AU	26.84	10:38:45.000	7.5	− 0.4	308.8
I05AU	42.29	12:05:06.100	–	–

Note that the arrival detected for I06AU is outside the reasonable celerity/slowness range of 250–450 m/s whereas with the methods with an arrival at around 10:03 UTC the celerity for this event would be around 320 m/s