Geodetic Research on Deception Island and its Environment (South Shetland Islands, Bransfield Sea and Antarctic Peninsula) During Spanish Antarctic Campaigns (1987–2007)

Berrocoso, Manuel; Fernández-Ros, A.; Ramírez, M. E.; Salamanca, José Manuel Enríquez de; Lozano, Cristina Torrecillas; Pérez-Peña, Alejandro; Páez, R.; García‐García, A.; Jiménez-Teja, Y.; García‐García, Francisco J.; Soto, Ruth; Gárate, Jorge; Martín-Dávila, J.; Sánchez‐Alzola, Alberto; Gil, A. de; Fernández-Prada, J.A.; Jigena, Bismarck

doi:10.1007/978-3-540-74882-3_6

Cited by 17 publications

(39 citation statements)

References 25 publications

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“…2a). This reference frame was designed with the aim of enabling geodynamic studies based on GNSS–GPS geodetic techniques (Berrocoso et al 2008). It is formed by 15 benchmarks on Deception Island's inner ring, from which that located near the Spanish Base Gabriel de Castilla BEGC is considered the reference benchmark, benefiting from the Base's logistic.…”

Section: Geodetic Infrastructurementioning

confidence: 99%

Normal vector analysis from GNSS—GPS data applied to Deception volcano surface deformation

Berrocoso

Prates

Fernández-Ros

et al. 2012

Geophysical Journal International

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SUMMARY Surface deformation parameters and its use in volcano monitoring have evolved from classical geodetic procedures up to those based on Global Navigation Satellite Systems (GNSS), in particular the most widely used and known Global Positioning System (GPS), profiting from the automated data processing, positioning precision and rates, as well as the large storage capacity and low power consumption of its equipments. These features have enabled the permanent GNSS–GPS data acquisition to ensure the continuous monitoring of geodetic benchmarks for the evaluation of surface deformation in active tectonic or volcanic areas. In Deception Island (Antarctica), a normal vector analysis is being used to give surface deformation based on three permanently observed GNSS–GPS benchmarks. Due to data availability, both in the past and for near real‐time use, all benchmarks used are inside the monitored volcanic area, although the reference is away from thermal springs and/or fumaroles, unlike the other two. The time variation of slope distances to the reference benchmark and of the magnitude and inclination of the normal vector to the triangle defined by the reference benchmark and any other two, provides the spatial deformation in the volcanic area covered. The normal vector variation in magnitude gives information on compression or expansion, here called spatial dilatometer, while the changes in inclination gives information on relative uplift or subsidence, here called spatial inclinometer. In geodesy, the triangle is a basic geometric unit and the areal strain is commonly applied in tectonics and volcanism. The normal vector analysis conjugates both, benefiting from the method's precision, simplicity and possibility to model the surface using several triangles. The proposed method was applied to GNSS–GPS data collected every austral summer between 2001–2002 and 2009–2010 in Deception Island. The results evidence that Deception Island acts as a strain marker in the Bransfield Basin volcano‐tectonic setting.

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Section: Geodetic Infrastructurementioning

confidence: 99%

Normal vector analysis from GNSS—GPS data applied to Deception volcano surface deformation

Berrocoso

Prates

Fernández-Ros

et al. 2012

Geophysical Journal International

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“…These are the nearest points of the REGID geodetic network (Berrocoso et al 2006). The geodetic network consists of twelve stations on Deception Island situated around Port Foster (Berrocoso et al 2008), which are provided with WGS-84 geodetic co-ordinates with respect to the International Terrestrial Reference Frame 2000 (Altamimi et al 2002). Both geodetic stations have absolute co-ordinates accurate to 1 mm (Table III).…”

Section: Tide In Deception and Livingston Islandsmentioning

confidence: 99%

Study of tides and sea levels at Deception and Livingston islands, Antarctica

2011

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During the 2007-08 Spanish Antarctic campaign, two moorings of bottom pressure sensors were carried out over a ten week period. This paper presents the results of the tidal analysis from sea level records obtained at Deception and Livingston islands (South Shetland Islands, Antarctica). The main objective of this paper is to present a detailed study of the tidal characteristics at these two islands, for which statistical and harmonic analysis techniques are applied to the tidal records. A geodetic network was used to reference the pressure sensors. Geometric levelling, with an accuracy of 1 mm, allowed us to link the tidal marks with geodetic vertices located on Livingston and Deception islands. The amplitudes and phase lags obtained by harmonic analysis are compared to the harmonic constants of several coastal stations and co-tidal and co-range charts. Results show an evident influence of tides in the sea level signal, with a clear mixed semi-diurnal behaviour and a daily inequality between high and low waters. Measurements of salinity and temperature were made using electronic sensors. Results from this study showed that salinity and temperature were strongly influenced by tides. Seawater temperature varied in a manner that was consistent with the time series of residual bottom pressure.

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“…After the 1999 crisis there was a change in the movement of the island. It changed from an extension and elevation of the entire island to a compressive process of subsidence in the N and NW areas [Berrocoso et al, 2008]. The work of Caselli et al [2004] on the geochemistry of gases in the Fumarole Bay area after the 1999 crisis shows an increased SO 2 flux.…”

Section: Interpretation Of the Resultsmentioning

confidence: 99%

“…This chamber is situated at a depth of about 2-4 km under the inner bay of Deception, slightly shifted toward the W, elongated NW-SE direction. Deformation studies have situated the center of the superficial deformation produced after the 1999 crisis in the bay off Obsidianas Beach [Berrocoso et al, 2008]. Other studies had already suggested a possible resurgence of the Port Foster floor [Cooper et al, 1998] after the 1992 series.…”

Section: Interpretation Of the Resultsmentioning

confidence: 99%

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Characterization of fracture systems using precise array locations of earthquake multiplets: An example at Deception Island volcano, Antarctica

Carmona¹,

Almendros²,

Peña³

et al. 2010

J. Geophys. Res.

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[1] Volcano-tectonic earthquakes are common seismic events in active volcanic areas. The stress produced by volcanic processes is released through fracturing of the shallow crust. Very often, these earthquakes occur in multiplets with similar waveforms, a fact which indicates common source characteristics. In this work, we introduce a method that uses array techniques to calculate precise relative locations of earthquake multiplets. We use the relative slowness estimate method to determine accurately the apparent slownesses and propagation azimuths of the earthquakes relative to a selected master event.We also obtain precise estimates of the S-P delays. This information is used to calculate precise relative locations by ray tracing in an Earth model. We applied this method to determine the characteristics of the fractures activated during the 1999 seismic series at the Deception Island volcano, Antarctica. We selected a set of 17 earthquake multiplets, initially located in a small (4 × 4 km) region a few km NE of the array site. We estimated precise locations for 14 of the clusters. In most cases, hypocenters were distributed in well-defined planar geometries. We found the best fitting planes, which we interpreted as fractures in the medium. For two clusters, the method spatially separated the earthquakes into two subgroups. Thus, we obtained two planes for each of these clusters, resulting in a total of 16 fracture planes. This is the first time that the orientations of fracture planes related to a seismic series have been obtained using a seismic array. We performed several tests to check various aspects in relation to the stability of the method and concluded that the results were robust. The dip angles indicate that the planes are mostly subvertical, while the strike angles clearly show a NW-SE trend for most of the planes and a few planes with NE-SW trends. The geometry and position of these planes suggest that the 1999 seismic series was influenced by regional tectonics, although the origin of the destabilization of the system may be related to the reactivation of a shallow magma chamber.

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Geodetic Research on Deception Island and its Environment (South Shetland Islands, Bransfield Sea and Antarctic Peninsula) During Spanish Antarctic Campaigns (1987–2007)

Cited by 17 publications

References 25 publications

Normal vector analysis from GNSS—GPS data applied to Deception volcano surface deformation

Normal vector analysis from GNSS—GPS data applied to Deception volcano surface deformation

Study of tides and sea levels at Deception and Livingston islands, Antarctica

Characterization of fracture systems using precise array locations of earthquake multiplets: An example at Deception Island volcano, Antarctica

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