JESUS, M.C., MATOS, S., BELLI, G., GHERI, D., WALLENSTEIN, N.,  MARCHETTI, E. (2023) - The Use of a Local Infrasound Mobile Array and the IMS IS42 Station in Monitoring the 2022’s Seismovolcanic Crisis on São Jorge Island, Azores. CTBT: Science and Technology conference, SnT2023, 19 June - 23 June 2023, Vienna, Austria.

​The 2022’s São Jorge seismovolcanic crisis has provided an opportunity to deploy a portable infrasound array (SJ1) on the island, in a collaborative work between the University of the Azores (UAc) and the University of Florence (UniFI). This 4-element array became operational on 2nd April 2022 firstly with a diamond geometry, and after 3rd May 2022 with a centred triangular design. Therefore, SJ1 in association with the IMS infrasound station IS42, located on Graciosa Island at ~41 km distance, formed a temporary monitoring network, aiming to assist the monitoring activities related with the volcanic unrest in São Jorge Island. Both have different equipment, mainly regarding on sensor’s type: SJ1 is composed of 4 differential pressure transducers and the signal is digitised at 100 sps, while IS42 is formed by 8 absolute microbarometers rearranged into a 3- element triangular small aperture within a 5-element pentagonal aperture and signal digitised at 20 sps. We present here two examples of detections registered: (1) seismoacoustic signals associated to a low magnitude ​earthquake at São Jorge, and (2) a meteor offshore north of São Miguel Island, allowing to validate the overall detection capability and the importance of this type of solution to monitor local seismovolcanic activity.