GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 1.1 - POSTER GNGTS 2023 Comparison between two events of different nature in Tonga- Kermadec subduction zone: June 15 2019 M7.2 Kermadec Islands (New Zealand) earthquake and January 15 2022 Hunga Tonga-Hunga Ha’apai eruption S. D’Arcangelo 1,2 , A. Bonforte 1 , M. Calcara 1 , S.A. Campuzano, G. Cianchini 1 , M. De Caro 1 , A. De Santis 1 , D. Di Mauro 1 , C. Fidani 1 , S. Lepidi 1 , R. Maugeri 1 , A. Nardi 1 , M. Orlando 1 , L. Perrone 1 , A. Piscini 1 , M. Regi 1 , D. Sabbagh 1 , M. Soldani 1 1 Istituto Nazionale di Geofisica e Vulcanologia (INGV), 00143 Rome, Italy 2 Physics Department, Complutense University (UCM), 28040 Madrid, Spain The Tonga-Kermadec subduction zone represents one of the most active tectonic regions from both a seismic and volcanic point of view. Recently, two important events took place here: an M7.2 earthquake (EQ) in the middle of 2019, with the epicentre in Kermadec Islands (New Zealand) and an incredible eruption of Hunga Tonga-Hunga Ha’apai (HTHH) volcano in early 2022. Basing on the Lithosphere-Atmosphere-Ionosphere Coupling (LAIC) models, we analysed the three geo-layers with a multi-parameter approach to detect any effect related on the occurrence of the two events: a comparison of the two collective results permitted to identify the physics processes that interested events of different nature but in the same tectonic context. For the lithosphere, we conducted a seismic analysis of the Kermadec EQ and of the HTHH volcanic event, for the latter considering the equivalent magnitude attributed to its energy released, both into their respective Dobrovolsky area, that scales with magnitude. Passing to the atmosphere, the attention was focused on the anomalous changes of physical quantities related to temperature, pressure and the relevant presence of gases, possibly influenced by the events. Finally, the ionosphere was examined by ground- and satellite-based observations. The critical comparison of the effects seen before and after the events considered would allow us to clarify the LAIC in this complex tectonic context.