Geodetic implications on block formation and geodynamic domains in the South Shetland Islands, Antarctic Peninsula

Berrocoso, Manuel; Fernández-Ros, A.; Prates, Gonçalo; García, Alicia García; Kraus, Stefan

doi:10.1016/j.tecto.2015.10.023

Cited by 18 publications

(19 citation statements)

References 43 publications

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“…On the one hand, the region is under an extensional tectonic regime. Geodetic studies have shown that the Antarctic Peninsula and the South Shetland Islands are moving apart at a rate of 7-10 mm/year (Berrocoso et al, 2016;Dietrich et al, 2004). Thus, the occurrence of series of tectonic earthquakes is expected, similar to those produced at other oceanic ridges (e.g., Rundquist & Sobolev, 2002).…”

Section: The 2014-2015 Livingston Seismic Swarmmentioning

confidence: 96%

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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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Section: The 2014-2015 Livingston Seismic Swarmmentioning

confidence: 96%

“…Geodetic studies have shown that the Antarctic Peninsula and the South Shetland Islands are moving apart at a rate of 7-10 mm/year (Berrocoso et al, 2016;Dietrich et al, 2004). Both processes are likely to happen in that area off Livingston Island.…”

Section: The 2014-2015 Livingston Seismic Swarmmentioning

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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“…Thus, in the paper (Nield, 2014) continuous GNSS observations on PALM permanent station and on 6 stations of the LARsen Ice Shelf System Antarctica network (LARISSA) for the period of 1998.5 -2013, were used for investigation of the response of low-viscosity solid Earth on the unloading of ice-mass in Antarctic Peninsula region (Nield, 2014).In paper (Berrocoso, 2016), the regional geodynamic model of the South Shetland Islands and the Bransfield Basin region was proposed. This model was established based on GNSS observations conducted, during 2002 -2014 on the 9 geodetic benchmarks located the research region.…”

Section: Main Directions Of Geodynamic Research In Antarcticamentioning

confidence: 99%

“…Subsidence of the benchmarks, located on the Shetland Islands, according to the authors, might be a consequence of tectonic activity of the South Shetland Trench. Uplift of the Antarctic Peninsula benchmarks authors explained as an effect of glacial isostatic adjustment after the Larson B ice-shelf breakup (Berrocoso, 2016).…”

Section: Main Directions Of Geodynamic Research In Antarcticamentioning

confidence: 99%

Investigation of Changes of the Kinematic Parameters of Antarctic Tectonic Plate Using Data Observations of Permanent GNSS Stations

Tretyak

Forat

Holubinka

2017

Reports on Geodesy and Geoinformatics

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“…Particular attention is paid to recent geodynamic processes in West Antarctica, which covers in the past tectonically active zone as well as the area with recent volcanic manifestations. Dietrich et al (2004), Jiang et al (2009) and Berrocoso et al (2016) used GNSS observation to monitor the geodynamic processes of the region defined by the South Shetland Islands archipelago, the Bransfield Basin and the Antarctic Peninsula (all in West Antarctica) which is characterized by highly complex and unique geotectonic surroundings. The authors found that the absolute horizontal velocity vectors have a north east direction and are in the range of 15-25 mm.…”

Section: Introductionmentioning

confidence: 99%

Recent local geodynamic processes in the Penola Strait_Lemaire Channel fault area (West Antarctica)

Savchyn¹

2021

Acta Geodynamica Et Geomaterialia

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We present the crustal deformation field in the Penola Strait – Lemaire Channel fault area (West Antarctica), based on the analysis of the 5 seasonal cycles of static GNSS survey. This 5 GNSS campaigns were conducted with approximately a 16-year interval from 2003 to 2019. The analyses indicate that average linear velocities of horizontal movements are multidirectional but no larger than 1 – 2 mm/yr. Average linear velocities of vertical movements are no larger than ±3 mm/yr. In the present work scheme of vertical and horizontal movements has been drawn out. The obtained results correlate well with the movements of the surrounding GNSS stations. Based on the analysis of spatial distribution of the Earth’s surface dilatation velocity the zones of extreme compression and expansion values were revealed. The analyses of spatial distribution of the Earth’s surface total shear velocity indicate that the studied region is horizontally heterogeneous. Based on the analysis of obtained results, a new kinematic model of fault area was developed. The possibility of using static GNSS survey to study recent local geodynamic processes in Antarctica has been demonstrated.

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Geodetic implications on block formation and geodynamic domains in the South Shetland Islands, Antarctic Peninsula

Cited by 18 publications

References 43 publications

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

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

Investigation of Changes of the Kinematic Parameters of Antarctic Tectonic Plate Using Data Observations of Permanent GNSS Stations

Recent local geodynamic processes in the Penola Strait_Lemaire Channel fault area (West Antarctica)

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