Scaling behavior and source mechanism of tremor recorded at Erebus volcano, Ross island, Antarctica

Konstantinou, K. I.; Ardiani, Mei Astrid; Sudibyo, Maria R.P.

doi:10.1016/j.pepi.2019.03.010

Cited by 8 publications

(8 citation statements)

References 36 publications

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“…For sake of clarity, in the case of Ischia Island, we are dealing with a hydrothermal tremor generated by a geothermal system made of a network of conduits. In general, the tremor source process can be characterized by a mean length scale that may correspond, for example, to a conduit filled with fluid 49 . In line with these thoughts, the collective behaviour of such a complex system can be ideally assimilated to an equivalent pipe, whose length can be estimated, providing indications both on the spatial scales involved in the phenomenon and on the physical behaviour of the system (i.e.…”

Section: Discussionmentioning

confidence: 99%

Picking up the hydrothermal whisper at Ischia Island in the Covid-19 lockdown quiet

Falanga

Cusano

Lauro

et al. 2021

Sci Rep

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In this paper, we analyse the seismic noise at Ischia Island (Italy) with the objective of detecting the hydrothermal source signals taking advantage of the Covid-19 quiescence due to lockdown (strong reduction of anthropogenic noise). We compare the characteristics of the background noise in pre-, during and post-lockdown in terms of spectral content, energy release (RMS) and statistical moments. The continuous noise is decomposed into two independent signals in the 1−2 Hz and 2−4 Hz frequency bands, becoming sharpened around 1 Hz and 3 Hz respectively in lockdown. We propose a conceptual model according to which a dendritic system of fluid-permeated fractures plays as neighbour closed organ pipes, for which the fundamental mode provides the persistent whisper and the first higher mode is activated in concomitance with energy increases. By assuming reasonable values for the sound speed in low vapor–liquid mass fraction for a two-phase fluid and considering temperatures and pressures of the shallow aquifer fed by sea, meteoric and deep hydrothermal fluids, we estimate pipe lengths in the range 200–300 m. In this scheme, Ischia organ-like system can play both continuous whisper and transients, depending on the energy variations sourced by pressure fluctuations in the hydrothermal fluids.

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Section: Discussionmentioning

confidence: 99%

Picking up the hydrothermal whisper at Ischia Island in the Covid-19 lockdown quiet

Falanga

Cusano

Lauro

et al. 2021

Sci Rep

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“…The results of the analysis also found no change in patternfrom exponential law to power law, which means that no change in the source process has occurred. The source process can also be seen from the relationship between the characteristic amplitude value and the lowest frequency [14], Figure 6 shows the correlation of the two and the correlation is obtained that the greater the characteristic amplitude value, the lower the lowest frequency value. This value confirms that the source of the volcanic tremor of Mount Ijen is caused by a scalebound source.…”

Section: Duration-amplitude Distributionmentioning

confidence: 94%

“…The distribution of the duration-amplitude of volcanic tremor at several volcanoes in the world has been studied and found that all distribution patterns follow the exponential law model [9,[11][12][13][14]. The exponential scaling of tremor indicates that the source of the tremor must come from a scale-bound source.…”

Section: Introductionmentioning

confidence: 99%

The Duration Amplitude Distribution of Volcanic Tremor Recorded at Ijen Volcano, Indonesia

Wildani,

Maryanto,

Rahadi Santoso

et al. 2023

Mal. J. Fund. Appl. Sci.

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This research was conducted with the aim of explaining the physical processes that occur at the source. The duration-amplitude distribution is an amplitude scaling method that can describe the process of sustained earthquake sources such as volcanic tremors. The data used in this study are seismic data from Mount Ijen for the period from January to March 2012 and January to March 2014. Scaling the duration amplitude distribution is done by converting the amplitude to reduced displacement (DR). The cumulative duration is calculated with a range of 3-12 cm2 which is the lowest and highest reduced displacement values. The cumulative duration plot results are then adjusted to the power law model and the exponential model. a correlation coefficient (R2) was calculated to evaluate the fit for each of these models. The results showed that the R2 exponential model was higher than the R2 power law model for all events in both 2012 and 2014 and there was no transition between the two models. This indicates that the source process of the Ijen volcano volcanic tremor is related to the scale-bound source process and there was no source change in either 2012 or 2014. However, differences in amplitude characteristics were found in 2012 and 2014. The volcanic tremors in 2012 were stronger than those in 2014, according with the reality of changing the condition of the crater lake which is stronger in 2012. Volcanic tremors and changes in the Ijen crater lake are important for forecasting the eruption of the Ijen volcano.

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“…Moreover, volcanic tremors usually change in amplitude and spectral content over time, which is mainly attributed to source effects (Hotovec et al 2013;Ogiso et al 2015;Jolly et al 2020). Tracking the characteristics of the tremor wavefield has allowed the development of conceptual models of the geometry and dynamics of the volcanic feeding system (Almendros et al 2014;Unglert and Jellinek 2015) and eruptive conduits (Ogiso et al 2015;Yukutake et al 2017;Konstantinou et al 2019).…”

Section: Introductionmentioning

confidence: 99%

“…When only a single three-component (triaxial) seismic station records the volcanic tremor, several analyses exist for its characterization, such as measuring the nonlinearity (Konstantinou and Schlindwein 2003) or scaling behavior (Benoit et al 2003;Konstantinou et al 2019) of the component with the lower signal-to-noise ratio. While detecting short-duration episodes (of the order of seconds to minutes) is usually achieved by a visual inspection of the seismogram, longer durations may require applying data reduction methods (DRM) (Carniel 2014;Melchor et al 2020;Caudron et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Long-duration seismicity and their relation to Copahue volcano unrest

Melchor

Almendros

Hantusch

et al. 2022

Earth Planets Space

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Understanding seismic tremor wavefields can shed light on the complex functioning of a volcanic system and, thus, improve volcano monitoring systems. Usually, several seismic stations are required to detect, characterize, and locate volcanic tremors, which can be difficult in remote areas or low-income countries. In these cases, alternative techniques have to be used. Here, we apply a data-reduction approach based on the analysis of three-component seismic data from two co-located stations operating in different times to detect and analyze long-duration tremors. We characterize the spectral content and the polarization of 355 long-duration tremors recorded by a seismic sensor located 9.5 km SE from the active vent of Copahue volcano in the period 2012–2016 and 2018–2019. We classified them as narrow- (NB) and broad-band (BB) tremors according to their spectral content. Several parameters describe the characteristic peaks composing each NB episode: polarization degree, rectilinearity, horizontal azimuth, vertical incidence. Moreover, we propose two coefficients $$C_P$$ C P and $$C_L$$ C L for describing to what extent the wavefield is polarized. For BB episodes, we extend these attributes and express them as a function of frequency. We compare the occurrence of NB and BB episodes with the volcanic activity (including the level of the crater lake, deformation, temperature, and explosive activity) to get insights into their mechanisms. This comparison suggests that the wavefield of NB tremors becomes more linearly polarized during eruptive episodes, but does not provide any specific relationship between the tremor frequency and volcanic activity. On the other hand, BB tremors show a seasonal behavior that would be related to the activity of the shallow hydrothermal system. Graphical Abstract

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Scaling behavior and source mechanism of tremor recorded at Erebus volcano, Ross island, Antarctica

Cited by 8 publications

References 36 publications

Picking up the hydrothermal whisper at Ischia Island in the Covid-19 lockdown quiet

Picking up the hydrothermal whisper at Ischia Island in the Covid-19 lockdown quiet

The Duration Amplitude Distribution of Volcanic Tremor Recorded at Ijen Volcano, Indonesia

Long-duration seismicity and their relation to Copahue volcano unrest

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