Rapid magma ascent beneath La Palma revealed by seismic tomography
Metadatos
Mostrar el registro completo del ítemEditorial
Springer Nature
Fecha
2022-10-21Referencia bibliográfica
D’Auria, L., Koulakov, I., Prudencio, J. et al. Rapid magma ascent beneath La Palma revealed by seismic tomography. Sci Rep 12, 17654 (2022). [https://doi.org/10.1038/s41598-022-21818-9]
Patrocinador
FEMALE project of the Spanish Government (Grant No. PID2019-106260GB-I00); Russian Science Foundation (Grant No. 20-17-00075); INVOLCAN team was supported by the projects VOLRISKMAC II (MAC2/3.5b/328); EC Cooperation Transnational Program MAC 2014-2020; Spanish Ministry of Science and InnovationResumen
For the first time, we obtained high-resolution images of Earth's interior of the La Palma volcanic eruption that occurred in 2021 derived during the eruptive process. We present evidence of a rapid magmatic rise from the base of the oceanic crust under the island to produce an eruption that was active for 85 days. This eruption is interpreted as a very accelerated and energetic process. We used data from 11,349 earthquakes to perform travel-time seismic tomography. We present high-precision earthquake relocations and 3D distributions of P and S-wave velocities highlighting the geometry of magma sources. We identified three distinct structures: (1) a shallow localised region (< 3 km) of hydrothermal alteration; (2) spatially extensive, consolidated, oceanic crust extending to 10 km depth and; (3) a large sub-crustal magma-filled rock volume intrusion extending from 7 to 25 km depth. Our results suggest that this large magma reservoir feeds the La Palma eruption continuously. Prior to eruption onset, magma ascended from 10 km depth to the surface in less than 7 days. In the upper 3 km, melt migration is along the western contact between consolidated oceanic crust and altered hydrothermal material.