Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/879
DC Field | Value | Language |
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dc.contributor.authorall | Caracausi, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia | en |
dc.contributor.authorall | Italiano, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia | en |
dc.contributor.authorall | Martinelli, G.; ARPA Agenzia Regionale Prevenzione e Ambiente dell Emilia-Romagna, Sezione Provinciale di Reggio Emilia, Italy | en |
dc.contributor.authorall | Paonita, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia | en |
dc.contributor.authorall | Rizzo, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia | en |
dc.date.accessioned | 2006-02-22T11:11:36Z | en |
dc.date.available | 2006-02-22T11:11:36Z | en |
dc.date.issued | 2005 | en |
dc.identifier.uri | http://hdl.handle.net/2122/879 | en |
dc.description.abstract | Long-term geochemical monitoring performed in the seismic area of the Umbria-Marche region of Italy (i.e. Central Apennines) has allowed us to create a model of the circulation of fluids and interpret the temporal chemical and isotopic variations of both the thermal springs as well as the gas vents. Coincident with the last seismic crisis, which struck the region in 1997-1998, an enhanced CO2 degassing on a regional scale caused a pH-drop in all the thermal waters as a consequence of CO2 dissolution. Furthermore, much higher 3He/4He isotope ratios pointed to a slight mantle-derived contribution. Radon activity increased to well above the ±2 sinterval of the earlier seismic period, after which it abruptly decreased to very low levels a few days before the occurrence of the single deep-located shock (March 26, 1998, 51 km deep). The anomalous CO2 discharge was closely related to the extensional movement of the normal faults responsible for the Mw 5.7, 6.0 and 5.6 main shocks that characterized the earlier seismic phase. In contrast, a clear compressive sign is recognizable in the transient disappearance of the deep-originating components related to the Mw 5.3, 51 km-deep event that occurred on March 26, 1998. Anomalies were detected concomitantly with the seismicity, although they also occurred after the seismic crisis had terminated. We argue that the observed geochemical anomalies were driven by rock permeability changes induced by crustal deformations, and we describe how, in the absence of any release of elastic energy, the detection of anomalies reveals that a seismogenic process is developing. Indeed, comprehensive, long-term geochemical monitoring can provide new tools allowing us to better understand the development of seismogenesis. | en |
dc.format.extent | 1636841 bytes | en |
dc.format.mimetype | application/pdf | en |
dc.language.iso | English | en |
dc.publisher.name | INGV | en |
dc.relation.ispartof | Annals of Geophysics | en |
dc.relation.ispartofseries | 1/48 (2005) | en |
dc.subject | geochemical monitoring | en |
dc.subject | seismicity | en |
dc.subject | helium | en |
dc.subject | thermal waters | en |
dc.title | Long-term geochemical monitoring and extensive/compressive phenomena: case study of the Umbria Region (Central Apennines, Italy) | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.subject.INGV | 04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry | en |
dc.description.journalType | JCR Journal | en |
dc.description.fulltext | open | en |
dc.contributor.author | Caracausi, A. | en |
dc.contributor.author | Italiano, F. | en |
dc.contributor.author | Martinelli, G. | en |
dc.contributor.author | Paonita, A. | en |
dc.contributor.author | Rizzo, A. | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia | en |
dc.contributor.department | ARPA Agenzia Regionale Prevenzione e Ambiente dell Emilia-Romagna, Sezione Provinciale di Reggio Emilia, Italy | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia | en |
item.openairetype | article | - |
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 | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italia | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italia | - |
crisitem.author.dept | ARPA Emilia-Romagna | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italia | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Milano, Milano, Italia | - |
crisitem.author.orcid | 0000-0003-2510-2890 | - |
crisitem.author.orcid | 0000-0002-9465-6398 | - |
crisitem.author.orcid | 0000-0001-9124-5027 | - |
crisitem.author.orcid | 0000-0003-2225-3781 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
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 | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
Appears in Collections: | Annals of Geophysics |
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File | Description | Size | Format | |
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05Caracausi.pdf | 1.6 MB | Adobe PDF | View/Open |
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