Journal
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
Volume 392, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jvolgeores.2019.106757
Keywords
Monogenetic volcanic field; Magmatic intrusion; Seismic swarms; Helium and carbon isotopes; Radon and thoron concentrations in soil; La Palma
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Funding
- Instituto Geografico Nacional (IGN
- Ministerio de Fomento, Spanish Government)
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Monogenetic eruptions are the most common volcanic activity in the world. However, unrest monitoring data are scarce due to the long intervening quiescence periods. This study analyzes unrest signals recorded in one of the largest monogenetic fields in the Canary Islands, Cumbre Vieja (La Palma). Two seismic swarms were registered in October 2017 and February 2018 with b-values of 1.6 +/- 0.1 and 2.3 +/- 0.2 respectively suggesting an intense magmatic fluids contribution, gas and/or magma. Both swarms were linked to changes in gas emissions. Increases in hydrogen concentration, and (R/R-a)(c) up to 7.52 +/- 0.05, were recorded before the first swarm, at the sampling point closest to where seismicity was located, indicating a deep gas input. After the second swarm, increases in (R/R-a)(c) and thoron soil concentration were recorded at two locations. This dataset is compatible with a stalled magmatic intrusion at ca. 25 km depth, with an estimated volume between 5.5.10(-4) km(3) and 3.10(-2) km(3). (C) 2019 Elsevier B.V. All rights reserved.
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