Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/8834
DC Field | Value | Language |
---|---|---|
dc.contributor.authorall | De Siena, L.; University of Munster, Institut fur Geophysik, Correnstrasse 24, 48149 Munster, Germany | en |
dc.contributor.authorall | Del Pezzo, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia | en |
dc.contributor.authorall | Thomas, C.; University of Munster, Institut fur Geophysik, Correnstrasse 24, 48149 Munster, Germany | en |
dc.contributor.authorall | Curtis, A.; School of GeoSciences, The University of Edinburgh, Grant Institute, The King’s Buildings, Edinburgh EH9 3JW, UK. | en |
dc.contributor.authorall | Margerin, L.; Institut de Recherche en Astrophysique et Plan´etologie, CNRS, Universit´e de Toulouse, Observatoire Midi-Pyr´en´ees, 14 Avenue Edouard Belin, 31400 Toulouse, France | en |
dc.date.accessioned | 2013-12-05T15:01:25Z | en |
dc.date.available | 2013-12-05T15:01:25Z | en |
dc.date.issued | 2013 | en |
dc.identifier.uri | http://hdl.handle.net/2122/8834 | en |
dc.description.abstract | Seismogram envelopes recorded at Campi Flegrei caldera show diffusive characteristics as well as steep amplitude increases in the intermediate and late coda, which can be related to the presence of a non-uniformly scattering medium. In this paper, we first show the results of a simulation with a statistical model considering anisotropic scattering interactions, in order to match coda-envelope duration and shape.We consider as realistic parameters for a volcanic caldera the presence of large square root velocity fluctuations (10 per cent) and two typical correlation lengths for such an heterogeneous crust, a = 0.1 and 1 km. Then, we propose the inclusion of a diffusive boundary condition in the stochastic description of multiple scattering, in order to model intermediate and late coda intensities, and particularly the sharp intensity peaks at some stations in the caldera. Finally, we show that a reliable 2-D synthetic model of the envelopes produced by earthquakes vertically sampling a small region can be obtained including a single drastic change of the scattering properties of the volcano, that is, a caldera rim of radius 3 km, and sections varying between 2 and 3 km. These boundary conditions are diffusive, which signifies that the rim must have more scattering potential than the rest of the medium, with its diffusivity 2–3 orders of magnitude lower than the one of the background medium, so that the secondary sources on its interface(s) could enhance coda intensities. We achieve a good first-order model of high-frequency (18 Hz) envelope broadening adding to the Monte Carlo solution for the incident flux the secondary source effects produced by a closed annular boundary, designed on the caldera rim signature at 1.5 km depth. At lower frequencies (3 Hz) the annular boundary controls the intermediate and late coda envelope behaviour, in a way similar to an extended diffusive source. In our interpretation, the anomalous intensities observed at several stations and predicted by the final Monte Carlo solutions are mainly due to the diffusive transmission reflection from a scattering object of increased scattering power, and are controlled by its varying thickness. | en |
dc.description.sponsorship | This work was carried out under the HPC-Europa2 project (project number: 228398) with the support of the European Commission Capacities Area-Research Infrastructures Initiative. We thank the whole staff at EPCC (Edinburgh Parallel Computing Centre) in Edinburgh and particularly Dr. Adam Carter for their help in both developing and parallelizing the code. The challenging comments and suggestions of the editor and two anonymous reviewers helped both in focusing the aim and in overcoming the strong limits of a previous version of the paper. | en |
dc.language.iso | English | en |
dc.publisher.name | Wiley-Blackwell | en |
dc.relation.ispartof | Geophysical Journal International | en |
dc.relation.ispartofseries | /195 (2013) | en |
dc.subject | Numerical solutions; | en |
dc.subject | Seismic anisotropy; | en |
dc.subject | Seismic attenuation | en |
dc.subject | Seismic tomography | en |
dc.subject | Wave scattering and diffraction | en |
dc.subject | Calderas | en |
dc.title | Seismic energy envelopes in volcanic media: in need of boundary conditions | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.description.pagenumber | 1102–1119 | en |
dc.subject.INGV | 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis | en |
dc.identifier.doi | 10.1093/gji/ggt273 | en |
dc.description.obiettivoSpecifico | 3.1. Fisica dei terremoti | en |
dc.description.journalType | JCR Journal | en |
dc.description.fulltext | restricted | en |
dc.relation.issn | 0956-540X | en |
dc.relation.eissn | 1365-246X | en |
dc.contributor.author | De Siena, L. | en |
dc.contributor.author | Del Pezzo, E. | en |
dc.contributor.author | Thomas, C. | en |
dc.contributor.author | Curtis, A. | en |
dc.contributor.author | Margerin, L. | en |
dc.contributor.department | University of Munster, Institut fur Geophysik, Correnstrasse 24, 48149 Munster, Germany | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia | en |
dc.contributor.department | University of Munster, Institut fur Geophysik, Correnstrasse 24, 48149 Munster, Germany | en |
dc.contributor.department | School of GeoSciences, The University of Edinburgh, Grant Institute, The King’s Buildings, Edinburgh EH9 3JW, UK. | en |
dc.contributor.department | Institut de Recherche en Astrophysique et Plan´etologie, CNRS, Universit´e de Toulouse, Observatoire Midi-Pyr´en´ees, 14 Avenue Edouard Belin, 31400 Toulouse, France | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | restricted | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OV, Napoli, Italia | - |
crisitem.author.dept | University of Munster, Institut fur Geophysik, Correnstrasse 24, 48149 Munster, Germany | - |
crisitem.author.dept | Université de Tolouse, France | - |
crisitem.author.orcid | 0000-0002-3615-5923 | - |
crisitem.author.orcid | 0000-0002-6981-5967 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
Appears in Collections: | Article published / in press |
Files in This Item:
File | Description | Size | Format | Existing users please Login |
---|---|---|---|---|
Geophys J Int 2013 De Siena195.pdf | Main Article + Figures | 3.22 MB | Adobe PDF |
WEB OF SCIENCETM
Citations
12
checked on Feb 10, 2021
Page view(s) 50
182
checked on Apr 24, 2024
Download(s)
19
checked on Apr 24, 2024