The infrasound station IS42, located in Graciosa Island, Azores archipelago, Portugal, is part of the International Monitoring System (IMS) of the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO): the station is certified since December 2010. The station comprises 8 array elements, which have been located in the most sheltered available areas of Graciosa Island: this configuration, joint to its strategic geographical location in the North Atlantic allows the detection of a large variety of infrasound signals, generated by local, regional and far-field sources.
A summary of the results of the collaborative research between the Instituto de Investigação em Vulcanologia e Avaliação de Riscos (IVAR) of the University of the Azores and the Department of Earth Sciences, University of Florence (UniFi), established in the framework of the Atmospheric dynamics Research InfraStructure in Europe (ARISE2) Project is presented.
In a first stage, a pilot study has been developed, aiming at compiling a first revision of the main recursive infrasonic detections at the station, in particular on the near- and far-field detections of explosive volcanic activity on Grímsvötn and Mount Etna volcanoes.
The updated results of the pilot study of the IS42 major infrasonic detections across different seasonal and operational conditions in the last 7 years are presented, with revisions of the PMCC parameters used on data processing. Specific highlights of the recorded infrasonic activity of microbaroms, auroras, earthquakes and anthropogenic sources are shown. The characterization of infrasonic detections at IS42 continues to progress and is expected to further develop in the future.