Please use this identifier to cite or link to this item:
Authors: Etiope, G.* 
Martinelli, G.* 
Caracausi, A.* 
Italiano, F.* 
Title: Methane seeps and mud volcanoes in Italy: gas origin, fractionation and emission to the atmosphere.
Issue Date: Jul-2007
Series/Report no.: 34 (2007)
DOI: 10.1029/2007GL030341
Keywords: Methane
mud volcanoes
Subject Classification03. Hydrosphere::03.04. Chemical and biological::03.04.05. Gases 
Abstract: Molecular composition, CH4 isotopes and gas flux of all main terrestrial mud volcanoes and other methane seeps in Italy are being assessed for the first time. Whereas 74% of the Italian gas reservoirs are biogenic, about 80% of the seeps release thermogenic gas. Dry-seep gas generally maintains the reservoir C1/(C2 + C3) ‘‘Bernard’’ ratio while mud volcanoes show molecular fractionation likely occurring during advective migration. Accordingly, a simple and direct use of the ‘‘Bernard’’ parameter might be misleading when applied to mud volcanoes as it could not always reflect the reservoir composition. Methane flux into the atmosphere from macro-seep areas is in the order of 102–106 t km-2y-1. Microseepage is widespread throughout large areas and, on a regional scale, it provides the main methane output. A first emission estimate for the total hydrocarbon-prone area of Italy suggests levels of 105 t y-1, comparable to national sources fromfossil fuel industry
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
Etiope-etal-GRL-CH4-ITALY.pdfArticle202.57 kBAdobe PDFView/Open
Show full item record

Page view(s)

Last Week
Last month
checked on Jul 22, 2018


checked on Jul 22, 2018

Google ScholarTM