Candidates for volcanoes under the ice of Antarctica detected by their gravito-topographic signal

We analyse the newest gravity field models (given in the form of spherical harmonic expansion to degree and order 2190) EIGEN 6C4 and RET 14, which consist basically from the gravity data from EIGEN 6C4 plus the bedrock topography from the Bedmap 2 model, describing the topography of the ground unde...

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Bibliographic Details
Published in:Annals of Geophysics
Main Authors: Klokocnik, Jaroslav, Kostelecky, Jan, Bezdek, Ales, Pesek, Ivan
Format: Article in Journal/Newspaper
Language:English
Published: Istituto Nazionale di Geofisica e Vulcanologia, INGV 2017
Subjects:
Antarctica
gravity field models EIGEN 6C4 and RET 14
Bedmap 2 topography
gravitational aspects
subglacial volcanoes
subglacial volcanoes in Antarctica
Lake Vostok
Antarc*
Online Access:https://www.annalsofgeophysics.eu/index.php/annals/article/view/7427
https://doi.org/10.4401/ag-7427
Description
Summary:We analyse the newest gravity field models (given in the form of spherical harmonic expansion to degree and order 2190) EIGEN 6C4 and RET 14, which consist basically from the gravity data from EIGEN 6C4 plus the bedrock topography from the Bedmap 2 model, describing the topography of the ground under ice of Antarctica. From these models we computed the gravity anomalies, the Marussi tensor of the second derivatives of the disturbing potential, the gravity invariants and their specific ratio, the strike angle and the virtual deformations. We apply these results for a selected part of Antarctica; not too far from the Lake Vostok we discovered at least two objects that might be subglacial volcanoes. We present all predictors and arguments we have available to support this hypothesis, but we are well aware that the “last word” waits for other specialists. We provide geographic coordinates on the ice cover where to dig for the possible volcanoes.

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