Rapid magma ascent beneath La Palma revealed by seismic tomography

被引:55
作者
D'Auria, Luca [1 ,2 ]
Koulakov, Ivan [3 ,4 ]
Prudencio, Janire [5 ,6 ]
Cabrera-Perez, Ivan [1 ]
Ibanez, Jesus M. [5 ,6 ]
Barrancos, Jose [1 ,2 ]
Garcia-Hernandez, Ruben [1 ]
Martinez van Dorth, David [1 ,2 ]
Padilla, German D. [1 ,2 ]
Przeor, Monika [1 ,2 ]
Ortega, Victor [1 ]
Hernandez, Pedro [1 ,2 ]
Perez, Nemesio M. [1 ,2 ]
机构
[1] Inst Volcanol Canarias INVOLCAN, Calle Alvaro Martin Diaz 2, Tenerife, Spain
[2] Inst Tecnol & Energias Renovables ITER, Poligono Ind Granadilla S-N, Tenerife 38600, Spain
[3] Trofimuk Inst Petr Geol & Geophys SB RAS, Prospekt Koptyuga 3, Novosibirsk 630090, Russia
[4] Inst Earths Crust SB RAS, Lermontova 128, Irkutsk, Russia
[5] Univ Granada, Sci Fac, Dept Theoret Phys & Cosmos, Avd Fuenteneueva S-N, Granada 18071, Spain
[6] Univ Granada, Andalusian Inst Geophys, Campus Cartuja,C Prof Clavera 12, Granada 18071, Spain
基金
俄罗斯科学基金会;
关键词
CANARY-ISLANDS; VOLCANIC ACTIVITY; DECEPTION ISLAND; ERUPTION;
D O I
10.1038/s41598-022-21818-9
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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.
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页数:13
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