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Tectonomagmatic activity and ice dynamics in the Bransfield Strait back-arc basin, Antarctica

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Title
Tectonomagmatic activity and ice dynamics in the Bransfield Strait back-arc basin, Antarctica
Other Titles
남극 브랜스필드 배호분지에서의 지체구조활동 및 빙권의 동역학적 움직임
Authors
Robert P. Dziak
Haru Matsumoto
Joseph H. Haxel
DelWayne R. Bohnenstiehl
Lee, Won Sang
Park, Minkyu
Subject
Geochemistry & Geophysics
Keywords
Bransfield; Hydroacoustics; Ice dynamics; Tectonomagmatism
Issue Date
2010
Publisher
American Geophysical Union
Citation
Robert P. Dziak, et al. 2010. "Tectonomagmatic activity and ice dynamics in the Bransfield Strait back-arc basin, Antarctica". JOURNAL OF GEOPHYSICAL RESEARCH, 115(B1): 1-14.
Abstract
An array of moored hydrophones was used to monitor the spatiotemporal distribution of small- to moderate-sized earthquakes and ice-generated sounds within the Bransfield Strait, Antarctica. During a 2 year period, a total of 3900 earthquakes, 5925 icequakes and numerous ice tremor events were located throughout the region. The seismic activity included eight space-time earthquake clusters, positioned along the central neovolcanic rift zone of the young Bransfield back-arc basin. These sequences of small magnitude earthquakes, or swarms, suggest ongoing magmatic activity that becomes localized along isolated volcanic features and fissure-like ridges in the southwest portion of the basin. A total of 122 earthquakes were located along the South Shetland trench, indicating continued deformation and possibly ongoing subduction along this margin. The large number of icequakes observed show a temporal pattern related to seasonal freeze-thaw cycles and a spatial distribution consistent with channeling of sea ice along submarine canyons from glacier fronts. Several harmonic tremor episodes were sourced from a large (~30 km2) iceberg that entered northeast portion of the basin. The spectral character of these signals suggests they were produced by either resonance of a small chamber of fluid within the iceberg, or more likely, due to periodicity of discrete stick-slip events caused by contact of the moving iceberg with the seafloor. These pressure waves appear to have been excited by abrasion of the iceberg along the seafloor as it passed Clarence and Elephant Islands.
URI
http://repository.kopri.re.kr/handle/201206/6345
DOI
http://dx.doi.org/10.1029/2009JB006295
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