Shallow structure of Deception Island, Antarctica, from correlations of ambient seismic noise on a set of dense seismic arrays

Luzón, Francisco; Almendros, Javier; García‐Jerez, Antonio

doi:10.1111/j.1365-246x.2011.04962.x

Cited by 31 publications

(30 citation statements)

References 69 publications

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“…On the contrary, the largest velocities occur near the SW caldera border, revealing the presence of compact materials at shallow depths. The low-velocity anomaly obtained by Luzón et al (2011) at 1 km matches with the high-attenuation unique anomaly shifted toward the north part of the bay.…”

Section: From Depths Of 1-2 Km Under Port Fostermentioning

confidence: 49%

“…5,6c). Zandomeneghi et al (2009) andLuzón et al (2011) both propose that unconsolidated volcanoclastic and volcano-sedimentary materials, possibly producing high attenuation, extend down to 1.2-1.4 km depth. We remark that the anomaly in the center of the bay shows much higher attenuation than the surroundings.…”

Section: From Depths Of 1-2 Km Under Port Fostermentioning

confidence: 97%

“…Luzón et al (2011) provide us information on the transverse velocity wave field between depths of 1 and 2 km. The lowest S-wave velocities (related in the interpretation of Luzón et al (2011) to the alterations produced by hydrothermal activity) are near the Chilean station ( Fig. 1) northeast of the bay.…”

Section: From Depths Of 1-2 Km Under Port Fostermentioning

confidence: 99%

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The 3D Attenuation Structure of Deception Island (Antarctica)

et al. 2015

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The seismic and volcanological structure of Deception Island (Antarctica) is an intense focus topic in Volcano Geophysics. The interpretations given by scientists on the origin, nature, and location of the structures buried under the island strongly diverge. We present a high-resolution 3D P-wave attenuation tomography model obtained by using the coda normalization method on 20,293 high-quality waveforms produced by active sources. The checkerboard and synthetic anomaly tests guarantee the reproduction of the input anomalies under the island down to a depth of 4 km. The results, once compared with our current knowledge on the geological, geochemical, and geophysical structure of the region, depict Deception as a piecemeal caldera structure coming out of the Bransfield Trough. Highattenuation anomalies contouring the northeastern emerged caldera rim correlate with the locations of sediments. In our interpretation, the main attenuation contrast, which appears under the collapsed southeastern caldera rim, is related to the deeper feeding systems. A unique P-wave high-attenuation spherical-like anomaly in the inner bay extends between depths of 1 and 3 km. The northern contour of the anomaly coincides with the calderic rim both at 1 and 2 km, while smaller anomalies connect it with deeper structures below 3 km, dipping toward the Bransfield Trough. In our interpretation, the large upper anomaly is caused by a high-temperature shallow (1-3 km deep) geothermal system, located beneath the sediment-filled bay in the collapsed blocks and heated by smaller, deeper contributions of molten materials (magma) rising from southeast.

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Section: From Depths Of 1-2 Km Under Port Fostermentioning

confidence: 49%

Section: From Depths Of 1-2 Km Under Port Fostermentioning

confidence: 97%

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The 3D Attenuation Structure of Deception Island (Antarctica)

et al. 2015

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“…Due to the lack of significant local seismicity in the region (Obermann et al, ), local earthquake tomography methods (Kissling, ; Koulakov & Shapiro, ; Thurber, ) could not be applied to investigate the subsurface velocity variations in the area below Lusi and the neighboring volcanic complex. A viable tool that has provided excellent results, also in volcanic environments, is ambient noise tomography (ANT) (Brenguier et al, ; Jaxybulatov et al, ; Luzón et al, ; Masterlark et al, ; Mordret et al, ; Obermann et al, ; Stankiewicz et al, ; Villagómez et al, ). The ANT method inverts dispersive surface waves across station pairs using long‐lasting records of seismic noise (Campillo & Paul, ; Claerbout, ; Lobkis & Weaver, ; Shapiro & Campillo, ).…”

Section: Introductionmentioning

confidence: 99%

The Plumbing System Feeding the Lusi Eruption Revealed by Ambient Noise Tomography

et al. 2017

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Lusi is a sediment‐hosted hydrothermal system featuring clastic‐dominated geyser‐like eruption behavior in East Java, Indonesia. We use 10 months of ambient seismic noise cross correlations from 30 temporary seismic stations to obtain a 3‐D model of shear wave velocity anomalies beneath Lusi, the neighboring Arjuno‐Welirang volcanic complex, and the Watukosek fault system connecting the two. Our work reveals a hydrothermal plume, rooted at a minimum 6 km depth that reaches the surface at the Lusi site. Furthermore, the inversion shows that this vertical anomaly is connected to the adjacent volcanic complex through a narrow (~3 km wide) low velocity corridor slicing the survey area at a depth of ~4–6 km. The NE‐SW direction of this elongated zone matches the strike of the Watukosek fault system. Distinct magmatic chambers are also inferred below the active volcanoes. The large‐scale tomography features an exceptional example of a subsurface connection between a volcanic complex and a solitary erupting hydrothermal system hosted in a hydrocarbon‐rich back‐arc sedimentary basin. These results are consistent with a scenario where deep‐seated fluids (e.g., magmas and released hydrothermal fluids) flow along a region of enhanced transmissivity (i.e., the Watukosek fault system damage zone) from the volcanic arc toward the back arc basin where Lusi resides. The triggered metamorphic reactions occurring at depth in the organic‐rich sediments generated significant overpressure and fluid upwelling that is today released at the spectacular Lusi eruption site.

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“…This results in a 3‐D velocity model. ANT has been used to image the Earth's subsurface over large areas (e.g., Bensen et al, ; Kang & Shin, ; Sabra et al, ; Villasenor et al, ; Yang et al, ; Yao et al, ), and on a local scale to image volcanic magmatic systems (e.g., Brenguier et al, ; Behr et al, ; Jaxybulatov et al, ; Luzón et al, ; Masterlark et al, ; Mordret et al, ; Nagaoka et al, ; Stankiewicz et al, ; Villagómez et al, ).…”

Section: Introductionmentioning

confidence: 99%

Imaging Torfajökull's Magmatic Plumbing System With Seismic Interferometry and Phase Velocity Surface Wave Tomography

et al. 2019

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Torfajökull volcano, Iceland, has not erupted since 1477. However, intense geothermal activity, deformation, and seismicity suggest a long‐lasting magmatic system. In this paper, we use ambient noise tomography to image the magmatic system beneath Torfajökull volcano. One hundred days of ambient noise data from 23 broadband seismometers show the consistent presence of double‐frequency microseism noise with significant power between ∼0.1 and 0.5 Hz. Beamforming results indicate microseism noise with persistent higher energy propagating from west and SE directions and apparent velocities below 3 km/s. We use ambient noise seismic interferometry to retrieve Rayleigh waves, and we introduce a method to estimate the reliability of the retrieved surface waves. We find stable estimation of surface wave phase velocities between 0.16 and 0.38 Hz. Azimuthal velocity variations show a trend of higher velocities in the NE/SW direction, the strike of the rift zone intersecting Torfajökull, and orientation of erupted lavas on a NE‐SW fissure swarm. Tomographic results indicate low‐velocity anomalies beneath the volcano caldera (between −5% and −10%) and even lower velocity variations in the southeast and southwest study area (below −10%), outside the volcano caldera. Low anomalies may indicate the existence of hot material, more prominent outside the caldera outskirts. High‐velocity variations (between 5% and 10%) outline the volcano caldera between 4‐ and 5‐km depth and more pronounced velocities (between 10% and 15%) up to 5‐km depth in the north of the volcano caldera. We interpret the former as possible caldera collapse structure and the latest as solidified intrusive magma from the old preferred magma paths.

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Shallow structure of Deception Island, Antarctica, from correlations of ambient seismic noise on a set of dense seismic arrays

Cited by 31 publications

References 69 publications

The 3D Attenuation Structure of Deception Island (Antarctica)

The 3D Attenuation Structure of Deception Island (Antarctica)

The Plumbing System Feeding the Lusi Eruption Revealed by Ambient Noise Tomography

Imaging Torfajökull's Magmatic Plumbing System With Seismic Interferometry and Phase Velocity Surface Wave Tomography

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