Changes in the Diffuse CO2 Emission and Relation to Seismic Activity in and around El Hierro, Canary Islands |
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| Authors: | Eleazar Padrón Gladys Melián Rayco Marrero Dácil Nolasco José Barrancos Germán Padilla Pedro A Hernández Nemesio M Pérez |
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| Institution: | (1) Enviromental Research Division, Instituto Tecnológico y de Energías Renovables (ITER), 38611 Granadilla, S/C de Tenerife, Spain |
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| Abstract: | Significant changes in the diffuse emission of carbon dioxide were recorded in a geochemical station located at El Hierro,
Canary Islands, before the occurrence of several seismic events during 2004. Two precursory CO2 efflux increases started thirteen and nine days before two seismic events of magnitude 2.3 and 1.7, which took place near
El Hierro Island, Canary Islands, on March 23 and April 15, reaching a maximun value of 51.1 and 46.2 g m−2 d−1, respectively, five and eight days before the two seismic events. Other similar increases started thirteen and five days
before the occurrence of two seismic events of magnitude 1.3 and 1.5 which took place on October 15 and 21 respectively, reaching
the maximum values four and one day before the earthquakes. These changes were not related to variations in atmospheric or
soil parameters. The Material Failure Forecast Method (FFM), which analyzes the rate of precursory phenomena, was successfully
applied to forecast the first seismic event that took place in El Hierro Island in 2004. |
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| Keywords: | El Hierro Island precursors Material Failure Forecast Method diffuse degassing carbon dioxide |
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