Seismic swarms and earthquake activity b-value related to the September 19, 2021, La Palma volcano eruption in Cumbre Vieja, Canary Islands (Spain)

被引:4
|
作者
Mezcua, Julio [1 ]
Rueda, Juan [1 ,2 ,3 ]
机构
[1] Fdn Jose Garcia Sineriz, Calle Alenza 1, Madrid 28003, Spain
[2] Inst Geog Nacl Expanol, Calle Alfonso XII 3, Madrid 28014, Spain
[3] Univ Politecn Madrid, Dept Ingn Topograf & Cartog, ETSI Topog Geodesia & Cartog, Calle Arboleda S-N, Madrid 28031, Spain
关键词
Swarm seismicity; Magma ascent; Gutenberg-Richter b parameter; FREQUENCY-MAGNITUDE DISTRIBUTION; SIZE DISTRIBUTION; MAGMA CHAMBERS; BENEATH; HAWAII; DEPTH; ETNA;
D O I
10.1007/s00445-023-01646-z
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The recent eruption of the Cumbre Vieja Volcanic Ridge in La Palma started on September 19, 2021, after a series of seismic swarms and lasted 85 days. Seismic swarms showed a large variability but could be grouped in two categories: long-term swarms located at subcrustal depth, showing b-values close to 2.2 and low rates (from 4.1 to 56 events/hour) and short-term swarms located at very shallow depths, showing moderate b-values [0.9, 1.6] and high rates (from 58 to 460 events/hour). Magma ascent velocity within the 0-10 km depth range varied between 0.03 and 0.21 km/h. Spatial and temporal characterization of the b-values for the entire magmatic process during the selected study period also indicated three distinct dynamics during a preparation phase starting from at least October 2017-August 2021, the eruptive phase from September 2021-December 2021 and a post-eruption process from the end of the eruption in December 2021-May 2022. These stages with clearly different values reflect two scenarios: one corresponding to the time before the eruption with magma ascending from a 39-km depth to the surface, and a second stage corresponding to the eruption itself which includes two seismicity concentrations within the 30-40 km depth interval and a shallow concentration from 0-20 km, corresponding to the crustal reservoir and movement towards the surface.
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页数:16
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