Fluid seepage in mud volcanoes of the northern Apennines: An integrated geophysical and geological study

Accaino, F.; Bratus, A.; Conti, Stefano; Fontana, Daniela; Tinivella, Umberta

doi:10.1016/j.jappgeo.2007.06.002

Cited by 34 publications

(18 citation statements)

References 29 publications

(35 reference statements)

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“…The central conductive anomaly seems to terminate towards the surface in a channel-like structure. The size of the dome structures as well as the occurrence of channel-like structures in the immediate subsurface is in agreement with previous studies (Accaino et al 2007). The NE part of the NMVF is characterized by two separate mud vents (Fig.…”

Section: Seismic Recordssupporting

confidence: 92%

“…2 show the direction of the resistivity profiles and their length. We did not perform any transverse profile across the SW cone as this was already investigated by Accaino et al (2007). The longitudinal profile ( Fig.…”

Section: Electrical Resistivity Tomographymentioning

confidence: 99%

“…Each emission centre is subcircular in shape, with a radius of about 20 m, and may reach up to 3 m above the ground. The cones consist of one or more mud vents Accaino et al (2007). and the expulsion of fluids is rhythmic and regular within a narrow time window (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Subsurface fluid distribution and possible seismic precursory signal at the Salse di Nirano mud volcanic field, Italy

Lupi¹,

Ricci

Kenkel

et al. 2015

Geophys. J. Int.

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S U M M A R YMud volcanoes are geological systems often characterized by elevated fluid pressures at depth deviating from hydrostatic conditions. This near-critical state makes mud volcanoes particularly sensitive to external forcing induced by natural or man-made perturbations. We used the Nirano mud volcanic field as a natural laboratory to test pre-and post-seismic effects generated by distant earthquakes. We first characterized the subsurface structure of the Nirano mud volcanic field with a geoelectrical study. Next, we deployed a broad-band seismic station in the area to understand the typical seismic signal generated by the mud volcano. Seismic records show a background noise below 2 s, sometimes interrupted by pulses of drumbeatlike high-frequency signals lasting from several minutes to hours. To date this is the first observation of drumbeat signal observed in mud volcanoes.In 2013 June we recorded a M4.7 earthquake, that occurred approximately 60 km far from our seismic station. According to empirical estimations the Nirano mud volcanic field should not have been affected by the M4.7 earthquake. Yet, before the seismic event we recorded an increasing amplitude of the signal in the 10-20 Hz frequency band. The signal emerged approximately two hours before the earthquake and lasted for about three hours. Our statistical analysis suggests the presence of a possible precursory signal about 10 min before the earthquake.

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Section: Seismic Recordssupporting

confidence: 92%

Section: Electrical Resistivity Tomographymentioning

confidence: 99%

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Subsurface fluid distribution and possible seismic precursory signal at the Salse di Nirano mud volcanic field, Italy

Lupi¹,

Ricci

Kenkel

et al. 2015

Geophys. J. Int.

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“…In the case of a well-studied mud volcano in Italy (Nirano, Northern Italy), detailed geophysical prospecting revealed the presence of such a reservoir 25-30 m below the main vents (Accaino et al, 2007).…”

Section: Modelling Tesmentioning

confidence: 99%

Monitoring methane emission of mud volcanoes by seismic tremor measurements: a pilot study

Albarello

Palo

Martinelli

2012

Nat. Hazards Earth Syst. Sci.

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Abstract.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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“…A shallow, basin-like lowresistivity zone may be the reservoir of the Wushanding MV, which connects with the Chishan Fault Zone. Accaino et al (2007), who used the geoelectric method to detect the sub-surface under MVs in the Nirano area, also found the shallow reservoir and explained that is the last phase of mud accumulation before final emission.…”

Section: Resultsmentioning

confidence: 94%

Mud volcanoes along the Chishan fault in Southwestern Taiwan: A release bend model

et al. 2010

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Fluid seepage in mud volcanoes of the northern Apennines: An integrated geophysical and geological study

Cited by 34 publications

References 29 publications

Subsurface fluid distribution and possible seismic precursory signal at the Salse di Nirano mud volcanic field, Italy

Subsurface fluid distribution and possible seismic precursory signal at the Salse di Nirano mud volcanic field, Italy

Monitoring methane emission of mud volcanoes by seismic tremor measurements: a pilot study

Mud volcanoes along the Chishan fault in Southwestern Taiwan: A release bend model

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