부산대학교 도서관

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jvolgeores.2007.12.044 Byline: Roberto Carniel (a), Marta Tarraga (b), Olivier Jaquet (c), Ramon Ortiz (b), Alicia Garcia (c) Keywords: stochastic analysis; Tenerife; Las CaA[+ or -]adas; Teide; seismic noise; variogram Abstract: The origin of the continuous seismic noise recorded during the last few years in the volcanic island of Tenerife (Canary Islands, Spain) is under debate, due to the important implications in terms of hazard. The seismic noise is strongly affected by anthropogenic contamination but previous work has shown that nevertheless a significant fraction of this noise has a natural origin, an origin that appears to be related to the generation of local tectonic events within or close to the island. In this paper, the variogram tool is used to characterize the so called "persistence" of the seismic noise. This analysis can quantify how much memory the seismic noise has of its recent past. This has important implications in terms of how informative the recorded noise can be about its future evolution, and this in turn puts important constraints on how likely it is for the seismic noise to be the source of potential precursors highlighting variations in the volcanic activity that is supposed to generate (part of) this seismic noise. In particular, the memory characterization can help to distinguish the naturally generated seismic noise from the anthropogenic contamination. Although only a few clear examples have been observed until now, the possibility that this memory can be affected by the occurrence of local tectonic events is also discussed. Author Affiliation: (a) Dipartimento di Georisorse e Territorio, Universita di Udine, Via Cotonificio, 114; 33100 Udine, Italy (b) Departamento de Volcanologia. Museo Nacional de Ciencias Naturales, CSIC, C/Jose Gutierrez Abascal 2; 28006 Madrid, Spain (c) In2Earth Modelling Ltd, c/o Wirtschafts-Treuhand AG, Arnold Bocklin-Strasse 25, 4051 Basel, Switzerland Article History: Received 11 June 2007; Accepted 11 December 2007