Infrasound Analysis: Reduction of Missed Events and Detection of Simultaneous Signals.

Automatic detection of infrasound signals, e.g. using microbarometer arrays of the International Monitoring System (IMS) from the Comprehensive Nuclear-Test-Ban Treaty (CTBT), requires low rates of both false alarms and missed events. In this presentation, we focus on the detection of simultaneous, low signal-to-noise ratio (SNR) infrasound signals. Simultaneous signals may mask each other and may cause low SNR values. We introduce a new method based on the Fisher detector and the Hough transform which allows reducing the number of missed events by 1) detecting low SNR signals and 2) detecting simultaneous signals. The new method is applied on multiple years of infrasound data from I18DK (Greenland) and shows an increase of 20% in the number of detections.