scholarly journals Airborne gravity over Lake Vostok and adjacent highlands of East Antarctica

2006 ◽  
Vol 7 (11) ◽  
pp. n/a-n/a ◽  
Author(s):  
John W. Holt ◽  
Thomas G. Richter ◽  
Scott D. Kempf ◽  
David L. Morse ◽  
Donald D. Blankenship
Keyword(s):  
East Antarctica ◽  
Airborne Gravity ◽  
Lake Vostok

Inversion and uncertainty estimation of gravity data using simulated annealing: An application over Lake Vostok, East Antarctica

Geophysics ◽  
2005 ◽  
Vol 70 (1) ◽  
pp. J1-J12 ◽  
Author(s):  
Lopamudra Roy ◽  
Mrinal K. Sen ◽  
Donald D. Blankenship ◽  
Paul L. Stoffa ◽  
Thomas G. Richter
Keyword(s):  
Simulated Annealing ◽  
Gravity Data ◽  
A Priori ◽  
Model Space ◽  
Uncertainty Estimation ◽  
East Antarctica ◽  
Airborne Gravity ◽  
Model Parameters ◽  
Data Set ◽  
Lake Vostok

Interpretation of gravity data warrants uncertainty estimation because of its inherent nonuniqueness. Although the uncertainties in model parameters cannot be completely reduced, they can aid in the meaningful interpretation of results. Here we have employed a simulated annealing (SA)–based technique in the inversion of gravity data to derive multilayered earth models consisting of two and three dimensional bodies. In our approach, we assume that the density contrast is known, and we solve for the coordinates or shapes of the causative bodies, resulting in a nonlinear inverse problem. We attempt to sample the model space extensively so as to estimate several equally likely models. We then use all the models sampled by SA to construct an approximate, marginal posterior probability density function (PPD) in model space and several orders of moments. The correlation matrix clearly shows the interdependence of different model parameters and the corresponding trade-offs. Such correlation plots are used to study the effect of a priori information in reducing the uncertainty in the solutions. We also investigate the use of derivative information to obtain better depth resolution and to reduce underlying uncertainties. We applied the technique on two synthetic data sets and an airborne-gravity data set collected over Lake Vostok, East Antarctica, for which a priori constraints were derived from available seismic and radar profiles. The inversion results produced depths of the lake in the survey area along with the thickness of sediments. The resulting uncertainties are interpreted in terms of the experimental geometry and data error.

Geophysical models for the tectonic framework of the Lake Vostok region, East Antarctica

2003 ◽  
Vol 216 (4) ◽  
pp. 663-677 ◽  
Author(s):  
Michael Studinger ◽  
Garry D Karner ◽  
Robin E Bell ◽  
Vadim Levin ◽  
Carol A Raymond ◽  
...  
Keyword(s):  
East Antarctica ◽  
Lake Vostok ◽  
Tectonic Framework

Searching for life in extreme environments relevant to Jovian’s Europa: Lessons from subglacial ice studies at Lake Vostok (East Antarctica)

2011 ◽  
Vol 48 (4) ◽  
pp. 697-701 ◽  
Author(s):  
Sergey A. Bulat ◽  
Irina A. Alekhina ◽  
Dominique Marie ◽  
Jean Martins ◽  
Jean Robert Petit
Keyword(s):  
Extreme Environments ◽  
East Antarctica ◽  
Lake Vostok

scholarly journals A revised inventory of Antarctic subglacial lakes

2005 ◽  
Vol 17 (3) ◽  
pp. 453-460 ◽  
Author(s):  
MARTIN J. SIEGERT ◽  
SASHA CARTER ◽  
IGNAZIO TABACCO ◽  
SERGEY POPOV ◽  
DONALD D. BLANKENSHIP
Keyword(s):  
East Antarctica ◽  
Large Lake ◽  
Dome A ◽  
Lake Vostok ◽  
The Third ◽  
The Us ◽  
Radio Echo Sounding ◽  
Subglacial Lakes ◽  
Lake Type ◽  
Echo Sounding

The locations and details of 145 Antarctic subglacial lakes are presented. The inventory is based on a former catalogue of lake-type features, which has been subsequently reanalysed, and on the results from three additional datasets. The first is from Italian radio-echo sounding (RES) of the Dome C region of East Antarctica, from which 14 new lakes are identified. These data also show that, in a number of occasions, multiple lake-type reflectors thought previously to be individual lakes are in fact reflections from the same relatively large lake. This reduces the former total of lake-type reflectors by six, but also adds a significant level of information to these particular lakes. The second dataset is from a Russian survey of the Dome A and Dome F regions of East Antarctica, which provides evidence of 18 new lakes and extends the coverage of the inventory considerably. The third dataset comprises three airborne RES surveys undertaken by the US in East Antarctica over the last five years, from which forty three new lakes have been identified. Reference to information on Lake Vostok, from Italian and US surveys taken in the last few years, is now included.

Ice flow field over Lake Vostok, East Antarctica inferred by structure tracking

2004 ◽  
Vol 227 (3-4) ◽  
pp. 249-261 ◽  
Author(s):  
Anahita A. Tikku ◽  
Robin E. Bell ◽  
Michael Studinger ◽  
Garry K.C. Clarke
Keyword(s):  
Flow Field ◽  
East Antarctica ◽  
Ice Flow ◽  
Lake Vostok

The bottom topography and subglacial Lake Vostok water body, East Antarctica

2010 ◽  
Vol 433 (2) ◽  
pp. 1092-1097 ◽  
Author(s):  
V. N. Masolov ◽  
S. V. Popov ◽  
V. V. Lukin ◽  
A. M. Popkov
Keyword(s):  
Water Body ◽  
Bottom Topography ◽  
East Antarctica ◽  
Lake Vostok ◽  
Subglacial Lake

scholarly journals Upward continuation of Dome-C airborne gravity and comparison with GOCE gradients at orbit altitude in east Antarctica

2016 ◽  
Vol 61 (1) ◽  
pp. 53-68 ◽  
Author(s):  
Hasan Yildiz ◽  
Rene Forsberg ◽  
Carl Christian Tscherning ◽  
Daniel Steinhage ◽  
Graeme Eagles ◽  
...  
Keyword(s):  
East Antarctica ◽  
Airborne Gravity ◽  
Upward Continuation

scholarly journals Victoria Land, Antarctica: An Improved Geodynamic Interpretation Based on the Strain Rate Field of the Current Crustal Motion and Moho Depth Model

2020 ◽  
Vol 13 (1) ◽  
pp. 87
Author(s):  
Antonio Zanutta ◽  
Monia Negusini ◽  
Luca Vittuari ◽  
Leonardo Martelli ◽  
Paola Cianfarra ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Ross Sea ◽  
East Antarctica ◽  
Gravity Potential ◽  
Moho Depth ◽  
Airborne Gravity ◽  
Narrow Strip ◽  
Continental Scale ◽  
Victoria Land ◽  
Marine Gravity

In Antarctica, the severe climatic conditions and the thick ice sheet that covers the largest and most internal part of the continent make it particularly difficult to systematically carry out geophysical and geodetic observations on a continental scale. It prevents the comprehensive understanding of both the onshore and offshore geology as well as the relationship between the inner part of East Antarctica (EA) and the coastal sector of Victoria Land (VL). With the aim to reduce this gap, in this paper multiple geophysical dataset collected since the 1980s in Antarctica by Programma Nazionale di Ricerche in Antartide (PNRA) were integrated with geodetic observations. In particular, the analyzed data includes: (i) Geodetic time series from Trans Antarctic Mountains DEFormation (TAMDEF), and Victoria Land Network for DEFormation control (VLNDEF) GNSS stations installed in Victoria Land; (ii) the integration of on-shore (ground points data and airborne) gravity measurements in Victoria Land and marine gravity surveys performed in the Ross Sea and the narrow strip of Southern Ocean facing the coasts of northern Victoria Land. Gravity data modelling has improved the knowledge of the Moho depth of VL and surrounding the offshore areas. By the integration of geodetic and gravitational (or gravity) potential results it was possible to better constrain/identify four geodynamic blocks characterized by homogeneous geophysical signature: the Southern Ocean to the N, the Ross Sea to the E, the Wilkes Basin to the W, and VL in between. The last block is characterized by a small but significant clockwise rotation relative to East Antarctica. The presence of a N-S to NNW-SSE 1-km step in the Moho in correspondence of the Rennick Geodynamic Belt confirms the existence of this crustal scale discontinuity, possibly representing the tectonic boundary between East Antarctica and the northern part of VL block, as previously proposed by some geological studies.

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