Volcanic tremors at etna: a model for hydraulic origin

Seidl, Dieter; Schick, R.; Riuscetti, M.

doi:10.1007/bf02598188

Cited by 102 publications

(46 citation statements)

References 3 publications

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“…This hypothesis is supported by a negative correlation between the gravity sequence recorded at PDN and the volcanic tremor observed at both PDN and ESP stations (placed respectively within a few meter from PDN gravity station and in the southeastern sector of the volcano). Given that volcanic tremor is generated by fluid flow as gases escape through open magma-filled conduits (SEIDL et al, 1981;SCHICK, 1988) and has an amplitude related to the intensity of turbulent motions (LEONARDI et al, 1999), it is likely that increased degassing in the inferred source leads to both a gravity (mass) decrease and an increase in the spectral amplitude of the volcanic tremor, giving rise to the observed negative correlation. Fig.…”

Section: Case Studiesmentioning

confidence: 99%

Review of Microgravity Observations at Mt. Etna: A Powerful Tool to Monitor and Study Active Volcanoes

Carbone

Greco

2007

Pure appl. geophys.

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Microgravity observations at Mt. Etna have been routinely performed as both discrete (since 1986) and continuous (since 1998) measurements. In addition to describing the methodology for acquiring and reducing gravity data from Mt. Etna, this paper provides a collection of case studies aimed at demonstrating the potential of microgravity to investigate the plumbing system of an active volcano and detect forerunners to paroxysmal volcanic events.

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Section: Case Studiesmentioning

confidence: 99%

Review of Microgravity Observations at Mt. Etna: A Powerful Tool to Monitor and Study Active Volcanoes

Carbone

Greco

2007

Pure appl. geophys.

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“…According to SEIDL et al (1981), andSCHICK et al (1982), there is some evidence that at Mt. Etna, which is normally in persistent activity with open conduit, high tremor amplitude is linked to a strongly turbulent movement of a high level magma column, due to violent unmixing and migration of the gas phase.…”

Section: Discussionmentioning

confidence: 98%

Activity of mount Etna, 1977–1983: Volcanic phenomena and accompanying seismic tremor

Tanguy

Patanè²

1984

Bull Volcanol

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“…An understanding of the shear event distribution may facilitate identification of potential hazard areas. Studies in volcanology have shown that harmonic events may be associated with an opening and resonating crack associated with the movement of magma towards the surface (CHOUET, 1996) or with the existence of pressure transients within the fluid-gas mixture causing resonance phenomena within the magma itself (SEIDL et al, 1981). Active seismicity (both shear and harmonic) always was found to occur prior to volcanic eruptions.…”

Section: Discussionmentioning

confidence: 99%

Passive Seismic Monitoring of Mine-scale Geothermal Activity: A Trial at Lihir Open Pit Mine

Creighton

Gough³

2009

Pure Appl. Geophys.

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The Lihir open pit mine in Papua New Guinea is located inside an old volcano where geothermal activity is strongly present. Outbursts of hot water and steam into the mining areas were a major safety concern. Passive seismic monitoring was carried out at the mine to investigate whether the geothermal activities could be detected and located using microseismic techniques in a mining environment. In this trial, sixteen triaxial geophones which can withstand temperature up to 200°C were used and installed in four deep boreholes inside the pit. The microseismic events were discriminated using the STA/LTA triggering criterion. During 6 weeks of monitoring, more than 17,000 events were recorded. Approximately 12% of the events showed harmonic vibration characteristics similar to those observed in other geothermal and volcanic areas, suggesting that the geothermal activity inside the pit was captured by the microseismic monitoring system. More than 75% of the events present both P and S waves and they were interpreted to be associated with rock fracturing due to stress release near the bottom of the pit. Many geothermal-type events were located in areas where shear events occurred, implying that the detected geothermal events were not far from the mining area below the pit and they may also be associated with mining. The borehole installation of the geophones significantly reduced the interference of mining noise and achieved good observation of the seismic events. However, equipment installation requires great attention as the geophones may be destroyed due to unexpected rising temperature within the boreholes.

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Volcanic tremors at etna: a model for hydraulic origin

Cited by 102 publications

References 3 publications

Review of Microgravity Observations at Mt. Etna: A Powerful Tool to Monitor and Study Active Volcanoes

Review of Microgravity Observations at Mt. Etna: A Powerful Tool to Monitor and Study Active Volcanoes

Activity of mount Etna, 1977–1983: Volcanic phenomena and accompanying seismic tremor

Passive Seismic Monitoring of Mine-scale Geothermal Activity: A Trial at Lihir Open Pit Mine

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