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| Titel |
Monitoring methane emission of mud volcanoes by seismic tremor measurements: a pilot study |
| VerfasserIn |
D. Albarello, M. Palo, G. Martinelli |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 12, no. 12 ; Nr. 12, no. 12 (2012-12-11), S.3617-3629 |
| Datensatznummer |
250011254
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| Publikation (Nr.) |
 copernicus.org/nhess-12-3617-2012.pdf |
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| Zusammenfassung |
| A new approach for estimating methane emission at mud volcanoes is here
proposed based on measurements of the seismic tremor on their surface. Data
obtained at the Dashgil mud volcano in Azerbaijan reveal the presence of
energy bursts characterized by well-determined features (i.e. waveforms,
spectra and polarization properties) that can be associated with bubbling at
depth. Counting such events provides a possible tool for monitoring gas
production in the reservoir, thus minimizing logistic troubles and
representing a cheap and effective alternative to more complex approaches.
Specifically, we model the energy bursts as the effect of resonant gas
bubbles at depth. This modelling allows to estimate the dimension of the
bubbles and, consequently, the gas outflow from the main conduit in the
assumption that all emissions from depth occur by bubble uprising. The
application of this model to seismic events detected at the Dashgil mud
volcano during three sessions of measurements carried out in 2006 and 2007
provides gas flux estimates that are in line with those provided by
independent measurements at the same structure. This encouraging result
suggests that the one here proposed could be considered a new promising,
cheap and easy to apply tool for gas flux measurements in bubbling gas
seepage areas. |
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