Spectral parameters of volcanic tremors at etna

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

doi:10.1016/0377-0273(77)90004-x

Cited by 42 publications

(17 citation statements)

References 1 publication

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“…The spectra of volcanic tremors are usually dominated by one or more fundamental frequencies and their harmonics (Riuscetti et al, 1977;Konstantinou and Schlindwein, 2002) whereas tectonic tremor and LPLD event spectra, as shown above, are characteristically flat at low frequency and fall off in the manner of the spectra of regular earthquakes (Aki, 1967;Brune, 1970).…”

Section: Temporal and Spectral Analysismentioning

confidence: 96%

Long-period, long-duration seismic events during hydraulic stimulation of shale and tight-gas reservoirs — Part 1: Waveform characteristics

Das

Zoback

2013

GEOPHYSICS

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Long-period long-duration (LPLD) seismic events are relatively low-amplitude signals that have been observed during hydraulic fracturing in several shale-gas and tight-gas reservoirs. These events are similar in appearance to tectonic tremor sequences observed in subduction zones and transform fault boundaries. LPLD events are predominantly composed of S-waves, but weaker P-waves have also been identified. In some cases, microearthquakes are observed during the events. Based on the similarity with tectonic tremors and our observations of several impulsive S-wave arrivals within the LPLD events, we interpret the LPLD events as resulting from the superposition of slow shear-slip events on relatively large faults. Most large LPLD waveforms appear to start as a relatively slower, low-amplitude precursor, lacking clear impulsive arrivals. We estimate the energy carried by the larger LPLD events to be ∼1000 times greater than a ∼M W − 2 microseismic event that is typical of the events that occur during hydraulic stimulation. Over the course of the entire stimulation activity of five wells in the Barnett formation (each hydraulically fractured ten times), the LPLD events were found to cumulatively release over an order of magnitude higher energy than microearthquakes. The large size of these LPLD events, compared to microearthquakes, suggests that they represent slip on relatively large faults during stimulation of these extremely low-permeability reservoirs. Moreover, they imply that the accompanying slow slip on faults, probably mostly undetected, is a significant deformation process during multistage hydraulic fracturing.

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Section: Temporal and Spectral Analysismentioning

confidence: 96%

Long-period, long-duration seismic events during hydraulic stimulation of shale and tight-gas reservoirs — Part 1: Waveform characteristics

Das

Zoback

2013

GEOPHYSICS

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“…In Hawaii, shallow tremors are distinguished from deep ones by their amplitude distributions [ Aki and Koyanagi , 1981]. For Etna, Riuscetti et al [1977] calculated amplitude‐distance curves in different frequency bands and found, that the tremor sources are situated below the Central Crater of Etna. Considering the different rates of decay obtained for spectral peaks of tremor at low (2–3 Hz) and high (4–5 Hz) frequencies, they concluded that the low frequency source is situated deeper than the high‐frequency one.…”

Section: Introductionmentioning

confidence: 99%

Location of seismic events and eruptive fissures on the Piton de la Fournaise volcano using seismic amplitudes

Battaglia¹,

Aki²

2003

J. Geophys. Res.

203

194

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[1] We present a method for locating the source of seismic events on Piton de la Fournaise. The method is based on seismic amplitudes corrected for station site effects using coda site amplification factors. Once corrected, the spatial distribution of amplitudes shows smooth and simple contours for many types of events, including rockfalls, long-period events and eruption tremor. On the basis of the simplicity of these distributions we develop inversion methods for locating their origins. To achieve this, the decrease of the amplitude as a function of the distance to the source is approximated by the decay either of surface or body waves in a homogeneous medium. The method is effective for locating rockfalls, longperiod events, and eruption tremor sources. The sources of eruption tremor are usually found to be located at shallow depth and close to the eruptive fissures. Because of this, our method is a useful tool for locating fissures at the beginning of eruptions. Citation: Battaglia, J., and K. Aki, Location of seismic events and eruptive fissures on the Piton de la Fournaise volcano using seismic amplitudes,

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“…Etna shows a frequency content below 6 Hz [Schick and Riuscetti, 1973] lated to the velocity of gases, escaping through summit crater conduits [Schick and Riuscetti, 1973]. Stability of some spectral peaks has been related to the geometrical characteristics of resonant oscillators, excited by gas bubbles uprising in the magma [Riuscetti et al, 1977]. Assuming the resonant model, frequency content of tremor may depend on the interactions between viscous attenuation of magma and elastic properties of ground [Chouet, 1985].…”

Section: Introductionmentioning

confidence: 99%

Seismic and infrasonic evidences for an impulsive source of the shallow volcanic tremor at Mt. Etna, Italy

Ripepe

Coltelli

Privitera

et al. 2001

Geophysical Research Letters

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Spectral parameters of volcanic tremors at etna

Cited by 42 publications

References 1 publication

Long-period, long-duration seismic events during hydraulic stimulation of shale and tight-gas reservoirs — Part 1: Waveform characteristics

Long-period, long-duration seismic events during hydraulic stimulation of shale and tight-gas reservoirs — Part 1: Waveform characteristics

Location of seismic events and eruptive fissures on the Piton de la Fournaise volcano using seismic amplitudes

Seismic and infrasonic evidences for an impulsive source of the shallow volcanic tremor at Mt. Etna, Italy

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