Seismovolcanic signals at Deception Island volcano, Antarctica: Wave field analysis and source modeling

Ibáñez, Jesús M.; Pezzo, E. Del; Almendros, Javier; Rocca, Mario La; Alguacil, Gerardo; Ortiz, R.; García, Alicia García

doi:10.1029/2000jb900013

Cited by 90 publications

(69 citation statements)

References 31 publications

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“…The study of the seismic activity of the volcano is probably the most active and productive research line, as reported by Tejedo et al (2014). There are many results that help us better understand the dynamic and volcanological framework of the area, such as Vila et al (1992), , Ibáñez et al (1997Ibáñez et al ( , 2000Ibáñez et al ( , 2003, Saccorotti et al (2001), Martinez-Arevalo et al (2003), Benitez et al (2007), Carmona et al (2010Carmona et al ( , 2012Carmona et al ( , 2014, and García-Yeguas et al (2010). One of the objectives of these seismic studies is to provide 2D or 3D structure of the area, by using active or passive data as has been done by Ben-Zvi et al (2009), Zandomeneghi et al (2009), and Prudencio et al (2013).…”

Section: Introductionmentioning

confidence: 93%

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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: Introductionmentioning

confidence: 93%

“…1). Nowadays, its volcanic activity mainly consists of hot hydrothermal waters, fumarolic fields, and intense seismic activity composed by volcanic tremor, persistent long-period, and volcano-tectonic seismicity (Vila et al 1992;Ortiz et al 1997;Ibáñez et al 2000;Carmona et al 2012).…”

Section: Deception Island: Volcanological and Geophysical Modelsmentioning

confidence: 99%

The 3D Attenuation Structure of Deception Island (Antarctica)

et al. 2015

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“…In the framework of the Spanish Polar Program, the Andalusian Institute of Geophysics, University of Granada (IAG-UGR), has carried out research projects at Deception Island since 1994 to investigate the seismic activity and structure of the volcano and surrounding areas (e.g., Almendros et al, 1997Almendros et al, , 1999Benitez et al, 2007;Carmona et al, 2010Carmona et al, , 2012Carmona et al, , 2014García-Yeguas et al, 2011;Ibáñez et al, 1997Ibáñez et al, , 2000Ibáñez et al, , 2017Jiménez et al, 2017;Luzón et al, 2011;Prudencio et al, 2013Prudencio et al, , 2015Zandomeneghi et al, 2009). The IAG-UGR also monitors the seismic activity of Deception Island volcano and provides scientific advice for the management of the volcanic alert system.…”

Section: Introductionmentioning

confidence: 99%

Volcano‐Tectonic Activity at Deception Island Volcano Following a Seismic Swarm in the Bransfield Rift (2014–2015)

Almendros

Carmona

Jiménez

et al. 2018

Geophysical Research Letters

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In September 2014 there was a sharp increase in the seismic activity of the Bransfield Strait, Antarctica. More than 9,000 earthquakes with magnitudes up to 4.6 located SE of Livingston Island were detected over a period of 8 months. A few months after the series onset, local seismicity at the nearby (∼35 km) Deception Island volcano increased, displaying enhanced long‐period seismicity and several outbursts of volcano‐tectonic (VT) earthquakes. Before February 2015, VT earthquakes occurred mainly at 5–20 km SW of Deception Island. In mid‐February the numbers and sizes of VT earthquakes escalated, and their locations encompassed the whole volcanic edifice, suggesting a situation of generalized unrest. The activity continued in anomalously high levels at least until May 2015. Given the spatial and temporal coincidence, it is unlikely that the Livingston series and the Deception VT swarm were unrelated. We propose that the Livingston series may have produced a triggering effect on Deception Island volcano. Dynamic stresses associated to the seismic swarm may have induced overpressure in the unstable volcanic system, leading to a magmatic intrusion that may in turn have triggered the VT swarm. Alternatively, both the Livingston earthquakes and the VT swarm could be consequences of a magmatic intrusion at Deception Island. The Livingston series would be an example of precursory distal VT swarm, which seems to be a common feature preceding volcanic eruptions and magma intrusions in long‐dormant volcanoes.

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“…Similar methods are used routinely to complement the time signal analyses in the seismic monitoring of volcanic areas in order to distinguish the different types of seismic events produced by volcanoes (e.g. Ibañez et al, 2000;Del Pezzo, 2003). Spectrograms are also useful as a complement in locating pyroclastic flows (Jolly et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Seismic detection and characterization of landslides and other mass movements

Suriñach

Vilajosana

Khazaradze

et al. 2005

Nat. Hazards Earth Syst. Sci.

144

161

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Abstract. Seismic methods used in the study of snow avalanches may be employed to detect and characterize landslides and other mass movements, using standard spectrogram/sonogram analysis. For snow avalanches, the spectrogram for a station that is approached by a sliding mass exhibits a triangular time/frequency signature due to an increase over time in the higher-frequency constituents. Recognition of this characteristic footprint in a spectrogram suggests a useful metric for identifying other massmovement events such as landslides. The 1 June 2005 slide at Laguna Beach, California is examined using data obtained from the Caltech/USGS Regional Seismic Network. This event exhibits the same general spectrogram features observed in studies of Alpine snow avalanches. We propose that these features are due to the systematic relative increase in high-frequency energy transmitted to a seismometer in the path of a mass slide owing to a reduction of distance from the source signal. This phenomenon is related to the path of the waves whose high frequencies are less attenuated as they traverse shorter source-receiver paths. Entrainment of material in the course of the slide may also contribute to the triangular time/frequency signature as a consequence of the increase in the energy involved in the process; in this case the contribution would be a source effect. By applying this commonly observed characteristic to routine monitoring algorithms, along with custom adjustments for local site effects, we seek to contribute to the improvement in automatic detection and monitoring methods of landslides and other mass movements.

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Seismovolcanic signals at Deception Island volcano, Antarctica: Wave field analysis and source modeling

Cited by 90 publications

References 31 publications

The 3D Attenuation Structure of Deception Island (Antarctica)

The 3D Attenuation Structure of Deception Island (Antarctica)

Volcano‐Tectonic Activity at Deception Island Volcano Following a Seismic Swarm in the Bransfield Rift (2014–2015)

Seismic detection and characterization of landslides and other mass movements

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