Local Earthquake Seismic Tomography Reveals the Link Between Crustal Structure and Volcanism in Tenerife (Canary Islands)

Abstract

Volcanism in the Canary Islands has the potential to seriously affect the security of population and infrastructure. The recent eruption on La Palma (September-December 2021) did not cause any fatalities, but did destroy hundreds buildings, damaged roads, and seriously disrupted agricultural infrastructure on most parts of the island (Longpré, 2021). Volcanic unrest on El Hierro in 2011-2012 erupted a moderate volume of lava in offshore areas (Carracedo et al., 2012); however, the accompanying strong seismicity caused the evacuation of the island's

Local earthquake seismic tomography of the Southernmost Mariana subduction zone

“…The initial seismic data catalogue picked from OBSs contained 6753 P-wave arrivals and 4989 S-wave arrivals from 891 earthquakes. To select a subset of data suitable for seismic tomography, three criteria were applied: (a) only events with at least 9 total P and S picks were included, (b) events had to be within 100 km of the nearest seismic station, and (c) residual travel times after locating the events using a 1D velocity model had to be less than 2 s for P-waves and 3 s for S-waves (Raoof et al, 2017;Koulakov et al, 2023). After applying these selection criteria, the refined data set contained 3755 total picks, comprising 1993 P-wave picks and 1762 S-wave picks, from 298 events that met all the requirements.…”

“…Overall, the grid utilized in our study consisted of 300 nodes for the Vp model and 313 nodes for the Vs model. We performed multiple inversions in grids with various basic orientations (0, 22, 45, and 66°) to minimize the effects of node distribution on the results (Koulakov et al, 2023). Finally, we stacked the results into one model.…”