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| Titel |
Geochemical and geophysical approach to the Tenerife (Canary Islands) anomalous seismic swarm on the 2nd October 2016 |
| VerfasserIn |
Natividad Luengo-Oroz, Pedro Torres-González, Itahiza Domíguez Cerdeña, David Moure, Víctor Villasante-Marcos, María Jiménez-Mejías, Carmen del Fresno, Laura García-Cañada |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149310
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| Publikation (Nr.) |
 EGU/EGU2017-13645.pdf |
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| Zusammenfassung |
| On the 2nd October 2016, anomalous seismic activity took place in the volcanic island of
Tenerife. During 5 hours, 96 low magnitude earthquakes (<1mbLg) were located in the SW
zone of the island with an average depth of 10 km, close to the area where a seismic crisis
took place in 2004.
Seismic analysis of the swarm reveals more than 800 events manually detected showing a
high correlation between their waveforms. Relocation by double differences shows all
hypocenters situated in a small cluster with a radius of a few hundred meters. Magnitudes
ranged between 0 and 0.9 but the time evolution shows a variation in narrow bands of ±0.2
magnitudes.
In order to better understand the origin and main causes of such anomalous behavior in
the volcanic island, data obtained from different volcano monitoring techniques were
analyzed. GPS deformation data did not show anomalous changes related to the
studied phenomena. In the aim of this interdisciplinary interpretation, available
geochemical data from the IGN volcano monitoring network were also revised.
Values of several geochemical parameters previous to the seismic swarm have been
studied.
Chemical and isotopic analysis from fumaroles and soil gases, groundwater
physicochemical parameters, CO2 diffuse emissions from the soil, Rn and CO2
concentrations inside a gallery and soil temperature in the summit of Teide volcano
did not revealed significant geochemical changes clearly related to the seismic
activity on the 2thOctober 2016. However, this conclusion could be reconsidered in
the future since upcoming events may show new insights into past circumstances. |
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