THE 16TH TO 22ND MAY 2016 MOUNT ETNA ERUPTIVE ACTIVITY: INFRASONIC LONG-RANGE OBSERVATIONS AT IS42 STATION, AZORES ISLANDS
Authors: Sandro Matos(1), Emanuele Marchetti(2), Maurizio Ripepe(2) & Nicolau Wallenstein(2)
(1)Instituto de Investigação em Vulcanologia e Avaliação de Riscos (IVAR),Universidade dos Açores, Rua da Mãe de Deus, 9500-321 Ponta Delgada, Açores, Portugal
(2) Dipartimento di Scienze della Terra, Università di Firenze, Via G. La Pira, 4, 50121, Firenze, Italy
IS42 is located in the Azores islands, in the middle of the North Atlantic and is one of International Monitoring System (IMS) infrasound stations, able to detect reliably 1-kiloton explosions at ranges of up to 3000 km or more. On the behalf of the ARISE2 project, collaborative research between UNIFI and the University of the Azores, towards the characterization of extreme atmospheric events, allow to analyze detections on the station records that were attributed to Mt. Etna.
Recent volcanic activity is typically effusive with explosive episodes and lava fountaining, with often-large ash ejection in the atmosphere which generate weak (<20 Pa at 6 km) infrasound (Ulivieri, et al. 2013). In the period between December 2015 and May 2016, two large explosive phases lasting 5 days each occurred. We show how only the second episode were recorded at IS42. We present the comparison of infrasound recorded at IS42 station with data recorded near the source by ETN local infrasonic array.
Keywords: ARISE2, infrasound, North-Atlantic, IS42, Etna