Abstract
<p>“Deployment of broadband seismic stations on the Antarctica continent” is an ambitious project to improve the spatial resolution of seismic data across the Antarctic Plate and surrounding regions. Several international collaborative programs for the purpose of geomonitoring were conducted in Antarctica during the International Polar Year (IPY) 2007-2008. The Antarctica’s GAmburtsev Province (AGAP; IPY #147), the GAmburtsev Mountain SEISmic experiment (GAMSEIS), a part of AGAP, and the Polar Earth Observing Network (POLENET; IPY #185) were major contributions in establishing a geophysical network in Antarctica. The AGAP/GAMSEIS project was an internationally coordinated deployment of more than 30 broadband seismographs over the crest of the Gambursev Mountains (Dome-A), Dome-C and Dome-F area. The investigations provide detailed information on crustal thickness and mantle structure; provide key constraints on the origin of the Gamburtsev Mountains; and more broadly on the structure and evolution of the East Antarctic craton and subglacial environment. From GAMSEIS and POLENET data obtained, local and regional seismic signals associated with ice movements, oceanic loading, and local meteorological variations were recorded together with a significant number of teleseismic events. In this chapter, in addition to the Earth’s interiors, we will demonstrate some of the remarkable seismic signals detected during IPY that illustrate the capabilities of broadband seismometers to study the sub-glacial environment, particularly at the margins of Antarctica. Additionally, the AGAP and POLENET stations have an important role in the Federation of Digital Seismographic Network (FDSN) in southern high latitude.</p>
Highlights
Existing permanent seismic stations belonging to the Federation of Digital Seismographic Network (FDSN) allows resolution of the structure beneath Antarctica at a horizontal scale of ~1000 km, which is sufficient to detect fundamental differences in the lithosphere beneath East-West Antarctica, but not to clearly define the structure within each sector
Monitoring Earth’s deep interior In addition to the bedrock, crust and upper mantle which underlie the Antarctic ice sheet, the teleseismic data observed by the Antarctica’s GAmburtsev Province (AGAP)/GAmburtsev Mountain SEISmic experiment (GAMSEIS) and Polar Earth Observing Network (POLENET) hold a great advantage for investigating the heterogeneous structure and dynamics of the deep part of Earth’s interior
Summary The International Polar Year (IPY) 2007-2008 provided an excellent opportunity to make significant advances in geophysical monitoring of both polar regions. These advances serve as an important addition to the permanent global network of FDSN and such projects as Global Alliance of Regional Networks (GARNET), Regional Leapfrogging Arrays (RLA), Program Oriented Experiments (POE), POLENET and other geomonitoring science bodies and communities
Summary
Existing permanent seismic stations belonging to the Federation of Digital Seismographic Network (FDSN) allows resolution of the structure beneath Antarctica at a horizontal scale of ~1000 km, which is sufficient to detect fundamental differences in the lithosphere beneath East-West Antarctica, but not to clearly define the structure within each sector. From GAMSEIS and POLENET data obtained, local and regional seismic signals associated with ice movements, oceanic loading and local meteorological variations were recorded together with a significant number of teleseismic events.
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