GNGTS 2024 - Atti del 42° Convegno Nazionale

Session 1.3 GNGTS 2024 Preliminary single-staton template matching seismic catalogue for the area of Everest (Himalaya) R Percacci 1 , A Vuan 2 , G Verza 3 , M P Plasencia 2 , D Sandron 2 , F Petenat 2 1 Università degli studi di Trieste 2 Isttuto di Oceanografa e di Geofsica Sperimentale, OGS, Trieste 3 EvK2cnr, Bergamo From May 2014 to May 2023, we conducted a seismic monitoring project of the broadband staton (IO.EVN), installed at the EvK2 Pyramid Laboratory/Observatory (Petenat et al. 2014). The IO.EVN staton, operated by OGS in the Everest region (Nepal) at an alttude of 5000 m above sea level. We applied the matched-flter method (Gibbons & Ringdal 2006; Vuan et al., 2018) to detect and locate seismic events within a 30 km radius from the staton, using a catalogue of ~ 450 templates that we selected by a recursive STA/LTA trigger method based on a bandpass flter from 1 to 30 Hz and the coincidence of three channels. Single-staton template matching is evaluated and improved by coupling the mutual informaton score and the cross-correlaton values. We are currently analysing a rich catalogue of more than ~40000 events to distnguish between earthquakes, icequakes and rockfalls, and to identfy any noise sources or artfacts related to the staton operaton or the surrounding environment. References Gibbons, S.J., Ringdal, F.; 2006: The detecton of low magnitude seismic events using array- based waveform correlaton. Geophys. J. Int. 165 (1), 149–166. Petenat F., C. Cravos, T. Dawa Sherpa, L. Adhikari Sherpa, M. P. Plasencia Linares, M. Romanelli, G. Verza; 2014: The installaton of a new broadband seismometer to the EVK2-CNR Pyramid Internatonal Laboratory-Observatory (Everest, Nepal). 33° Convegno Nazionale Gruppo Nazionale di Geofsica della Terra Solida GNGTS. Bologna, 25-27 Novembre. 2014. Abstract. Vuan A. , Sugan M. , Amat G. , Kato A.; 2018: Improving the Detecton of Low-Magnitude Seismicity Preceding the Mw 6.3 L’Aquila Earthquake: Development of a Scalable Code Based on the Cross Correlaton of Template Earthquakes. Bull Seismol Soc Am 2018; 108 (1), 471–480. doi: htps://doi.org/10.1785/0120170106