Spatial distribution of intrinsic and scattering seismic attenuation in active volcanic islands - I: model and the case of Tenerife Island

Prudencio, Janire; Pezzo, Edoardo Del; García-Yeguas, Araceli; Ibáñez, Jesús M.

doi:10.1093/gji/ggt361

Cited by 48 publications

(50 citation statements)

References 31 publications

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“…3D source station ray paths obtained by using Thurber-modified ray-bending approach are represented eruptions. Prudencio et al (2013a) obtained 2D regional distribution of seismic attenuation separating scattering and intrinsic contribution (Q À1 i and Q À1 s , respectively). As their main results, we can mention the existence of a region in the middle of Tenerife Island with low attenuation interpreted as the effect of intermediate/deep consolidate rocks.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

3D Attenuation Tomography of the Volcanic Island of Tenerife (Canary Islands)

et al. 2015

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This paper shows a new multidisciplinary interpretation approach to the internal structure of Tenerife Island. The central core of this work is the determination of the three-dimensional attenuation structure of the region using P-waves and the coda normalization method. This study has been performed using 45,303 seismograms recorded at 85 seismic stations from an active experiment (air gun shots) conducted in January 2007. The interpretation of these new results is done combining the new images with previous studies performed in the area such as seismic velocity tomography, magnetic structure, magnetotelluric surveys or gravimetric models. Our new 3D images indicate the presence of seismic attenuation contrasts, with areas of high and low seismic attenuation patterns. High seismic attenuation zones are observed both in shallow and in deeper areas. The shallowest area of Las Cañadas caldera complex (1-3 km thick) is dominated by high attenuation behavior, and it is interpreted as the combined effect of sedimentary and volcanoclastic deposits, multifracture systems and the presence of shallow aquifers. At the same time, the deeper analyzed area, more than 8 km below sea level, is dominated by a high attenuation pattern, and it is interpreted as the consequence of the effect of hightemperature rocks in the crustal-mantle boundary. This interpretation is compatible and confirmed by previous models that indicate the presence of underplating magma in this region. On the contrary, some low attenuation bodies and structures have been identified at different depths. A deep low attenuation central body is interpreted as the original central structure associated with the early stage of Tenerife Island. At shallower depths, some low attenuation bodies are compatible with old intermediate magmatic chambers postulated by petrological studies. Finally, in the north of the island (La Orotava valley) we can interpret the low attenuation structure as the headwall of this valley, supporting the idea that Las Cañadas caldera and this valley resulted from two different destructive processes.

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Section: Magnetic Propertiesmentioning

confidence: 99%

3D Attenuation Tomography of the Volcanic Island of Tenerife (Canary Islands)

et al. 2015

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“…Q i and Q S are, respectively, the intrinsic‐ and scattering‐quality factors that can be expressed as a function of b and d by

Q_{i} = \frac{2 πf}{b}

Q_{s} = \frac{2 πfpd}{v^{2}}

and

Q_{i}^{- 1} + Q_{s}^{- 1} = Q_{T}^{- 1}

where f is the center‐band frequency (around which seismic data are filtered) and Q T is the total‐quality factor. The procedure used by Wegler and Lühr [] and Wegler [] (and updated by Prudencio et al , ) to fit equation to the experimental filtered seismogram envelopes was applied to obtain scattering‐ and intrinsic‐attenuation coefficients. In the following, we give a brief description of this procedure according to Prudencio et al []: The first step was a preliminary spectral analysis.…”

Section: Data Processing and Mapping Proceduresmentioning

confidence: 99%

“…The procedure used by Wegler and Lühr [] and Wegler [] (and updated by Prudencio et al , ) to fit equation to the experimental filtered seismogram envelopes was applied to obtain scattering‐ and intrinsic‐attenuation coefficients. In the following, we give a brief description of this procedure according to Prudencio et al []: The first step was a preliminary spectral analysis. The objective was to select the frequency intervals to perform the study.…”

Section: Data Processing and Mapping Proceduresmentioning

confidence: 99%

Two‐dimensional seismic attenuation images of Stromboli Island using active data

Prudencio

Pezzo

Ibáñez

et al. 2015

Geophysical Research Letters

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In this work we present intrinsic and scattering seismic attenuation 2‐D images of Stromboli Volcano. We used 21,953 waveforms from air gun shots fired by an oceanographic vessel and recorded at 33 inland and 10 ocean bottom seismometer seismic stations. Coda wave envelopes of the filtered seismic traces were fitted to the energy transport equation in the diffusion approximation, obtaining a couple of separate Qi and Qs in six frequency bands. Using numerically estimated sensitivity kernels for coda waves, separate images of each quality factor were produced. Results appear stable and robust. They show that scattering attenuation prevails over intrinsic attenuation. The scattering pattern shows a strong concordance with the tectonic lineaments in the area, while an area of high total attenuation coincides with the zone where most of the volcanic activity occurs. Our results provide evidence that the most important attenuation effects in volcanic areas are associated with the presence of geological heterogeneities.

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“…The first term of equation (2), E 0 (4π d t ) − p /2 , is also obtained from the fit and has no influence on the waveform but only on the absolute value, and therefore, it is not used to estimate attenuation values. The trade‐off between b and d parameters was analyzed in Prudencio et al (). They obtained an uncertainty interval of 8% and 6% for b and d , respectively.…”

Section: Methods Data and Data Processingmentioning

confidence: 99%

“…In the present study, we obtain two‐dimensional intrinsic (

Q_{normali}^{- 1}

) and scattering (

Q_{normals}^{- 1}

) attenuation images of Long Valley Caldera by applying the fitting procedure described in Wegler and Lühr () with the diffusion model and the back projection technique proposed by Prudencio et al () and improved by Del Pezzo et al (). We use local earthquakes and stations and hence are able to probe the upper 3–5 km of the crust, limiting our ability to characterize deeper structure.…”

Section: Introductionmentioning

confidence: 99%

Subsurface Structure of Long Valley Caldera Imaged With Seismic Scattering and Intrinsic Attenuation

2018

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We image seismic intrinsic ( Qnormali−1) and scattering ( Qnormals−1) attenuations in Long Valley Caldera, California, by analyzing more than 1,700 vertical component waveforms from local earthquakes. Observed energy envelopes are fit to the diffusion model and seismic attenuation images are produced using two‐dimensional space weighting functions. Low intrinsic and low scattering attenuation anomalies in the center south of the caldera correspond to the location of an earthquake swarm in 2014. We identify high intrinsic and high scattering attenuation anomalies in the fluid‐rich western and eastern areas of the caldera. From a comparison with other geophysical images (magnetotellurics and seismic tomography) we attribute these anomalies to a hydrothermal system (high attenuation). Average to high attenuation values are also observed at the adjacent Mammoth Mountain (southwest of the caldera) and may also have a hydrothermal origin. High intrinsic attenuation at low frequencies to the west of the Hartley Springs Fault may be produced by the magmatic system that produced the Inyo Craters. Seismic attenuation imaging provides insights into subsurface structures that are complementary to velocity and conductivity images.

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Spatial distribution of intrinsic and scattering seismic attenuation in active volcanic islands - I: model and the case of Tenerife Island

Cited by 48 publications

References 31 publications

3D Attenuation Tomography of the Volcanic Island of Tenerife (Canary Islands)

3D Attenuation Tomography of the Volcanic Island of Tenerife (Canary Islands)

Two‐dimensional seismic attenuation images of Stromboli Island using active data

Subsurface Structure of Long Valley Caldera Imaged With Seismic Scattering and Intrinsic Attenuation

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