Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/2171| DC Field | Value | Language |
|---|---|---|
| dc.contributor.authorall | Vanorio, T.; Géosciences Azur, CNRS, Université de Nice, Sophie Antinopolies, Valbonne, France | en |
| dc.contributor.authorall | Virieux, J.; Géosciences Azur, CNRS, Université de Nice, Sophie Antinopolies, Valbonne, France | en |
| dc.contributor.authorall | Zollo, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia | en |
| dc.contributor.authorall | Capuano, P.; Dipartimento di Scienze e Tecnologie per l’Ambiente e il Territorio, Università del Molise | en |
| dc.contributor.authorall | Russo, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia | en |
| dc.date.accessioned | 2007-06-14T08:59:41Z | en |
| dc.date.available | 2007-06-14T08:59:41Z | en |
| dc.date.issued | 2006 | en |
| dc.identifier.uri | http://hdl.handle.net/2122/2171 | en |
| dc.description.abstract | The Campi Flegrei (CF) caldera experiences dramatic ground deformations unsurpassed anywhere in the world. The source responsible for this phenomenon is still debated. With the aim of exploring the structure of the caldera as well as the role of hydrothermal fluids on velocity changes, a multidisciplinary approach dealing with 3-D delay-time tomography and rock physics characterization has been followed. Selected seismic data were modeled by using a tomographic method based on an accurate finite-difference travel-time computation which simultaneously inverts P-wave and S-wave first-arrival times for both velocity model parameters and hypocenter locations. The retrieved P-wave and S-wave velocity images as well as the deduced Vp/Vs images were interpreted by using experimental measurements of rock physical properties on CF samples, to take into account steam/water phase transition mechanisms affecting P-wave and S-wave velocities. Also, modelling of petrophysical properties for site-relevant rocks constrains the role of overpressured fluids on velocity. A flat and low Vp/Vs anomaly lies at 4 km depth under the city of Pozzuoli. Earthquakes are located at the top of this anomaly. This anomaly implies the presence of fractured over-pressured gas-bearing formations and excludes the presence of melted rocks. At shallow depth, a high Vp/Vs anomaly located at 1 km suggests the presence of rocks containing fluids in the liquid phase. Finally, maps of the Vp*Vs product show a high Vp*Vs horse-shoe shaped anomaly located at 2 km depth. It is consistent with gravity data and well data and might constitute the on-land remainder of the caldera rim, detected below sea level by tomography using active source seismic data. For a more exhaustive description of the utilized methodologies, of synthetic tests for spatial resolution and uncertainty assessment and, the interpretation of results, the reader may refer to the paper Vanorio et al. (2005). | en |
| dc.format.extent | 257698 bytes | en |
| dc.format.mimetype | application/pdf | en |
| dc.language.iso | English | en |
| dc.subject | NONE | en |
| dc.title | A rock physics and seismic tomography study to characterize the structure of the Campi Flegrei caldera | en |
| dc.type | book chapter | en |
| dc.subject.INGV | 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology | en |
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Initial reference models in local earthquake tomography. J. Geophys. Res., 99, 19635-46. Latorre D., Virieux J., Monfret T., Monteiller V., Vanorio T., Got J.-L., Lyon-Caen H. (2004). A new seismic tomography of Aigion area (Gulf of Corinth-Greece) from a 1991 dataset. Geophys. J. Int., 159, 1013-31. Newhall C. G., Dzurisin D. (1988). Historical unrest at large calderas of the world. U.S. Geol. Surv. Bull. B, 1855(1-2), 1108. Oliveri del Castillo A., Quagliariello M. T. (1969). Sulla genesi del bradisismo flegreo. Atti Assoc. Geofis. Ital., 4, 1-4. Sanders C. O., Ponko S. C., Nixon L. D., Schwartz E. A. (1995). Seismological evidence for magmatic and hydrothermal structure in Long Valley caldera from local earthquake attenuation and velocity tomography. J. Geophys. Res., 100, 8311-26. Spakman W., Nolet G. (1988). Imaging algorithms, accuracy and resolution, in Mathematical Geophysics, edited by N. Vlaar, pp. 155-87, Springer, New York. Thurber C. H. (1992). Hypocenter-velocity structure coupling in local earthquake tomography. Phys. Earth Planet. Inter., 75, 55-62. Vanorio T., Prasad M., Nur A., Patella D. (2002). Ultrasonic velocity measurements in volcanic rocks: Correlation with microtexture. Geophys. J. Int., 149, 22-36. Vanorio T. (2003). Physical properties of volcanic rocks from the Campanian Plain. TOMOVES: The Internal Structure of Mt. Vesuvius: A Seismic Tomography Investigation. Edited by P. Capuano et al., Liguori Editore, 553-580. Wang Z. W., Nur A. (1989). Effect of CO2 flooding on wave velocities in rocks and hydrocarbons. Soc. Pet. Eng. Res. Eng., 3, 429-39. Zollo A., Judenherc S., Auger E., D’Auria L., Virieux J., Capuano P., Chiarabba C., de Franco R., Makris J., Michelini A., Musacchio G. (2003). Evidence for the buried rim of Campi Flegrei caldera from 3-d active seismic imaging. Geophys. Res. Lett., 30(19), 2002, doi:10.1029/2003GL018173. | en |
| dc.description.fulltext | open | en |
| dc.contributor.author | Vanorio, T. | en |
| dc.contributor.author | Virieux, J. | en |
| dc.contributor.author | Zollo, A. | en |
| dc.contributor.author | Capuano, P. | en |
| dc.contributor.author | Russo, R. | en |
| dc.contributor.department | Géosciences Azur, CNRS, Université de Nice, Sophie Antinopolies, Valbonne, France | en |
| dc.contributor.department | Géosciences Azur, CNRS, Université de Nice, Sophie Antinopolies, Valbonne, France | en |
| dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia | en |
| dc.contributor.department | Dipartimento di Scienze e Tecnologie per l’Ambiente e il Territorio, Università del Molise | en |
| dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia | en |
| item.openairetype | book chapter | - |
| item.cerifentitytype | Publications | - |
| item.languageiso639-1 | en | - |
| item.grantfulltext | open | - |
| item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
| item.fulltext | With Fulltext | - |
| crisitem.author.dept | Stanford Rock Physics Laboratory, Stanford University, Stanford, CA, USA | - |
| crisitem.author.dept | UMR Geosciences Azur, Sophia Antipolis, France | - |
| crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OV, Napoli, Italia | - |
| crisitem.author.dept | Università degli Studi di Salerno | - |
| crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OV, Napoli, Italia | - |
| crisitem.author.orcid | 0000-0002-8191-9566 | - |
| crisitem.author.orcid | 0000-0002-6074-6977 | - |
| crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
| crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
| crisitem.classification.parent | 04. Solid Earth | - |
| crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
| crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
| Appears in Collections: | Book chapters | |
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