P-wave velocity structure beneath the northern Antarctic Peninsula

Title
P-wave velocity structure beneath the northern Antarctic Peninsula
Author(s)
박용철; 김광희; Y.Jin
Publication Year
2010-12-14
Abstract
We have imaged tomographically the tree-dimensional velocity structure of the upper mantle beneath the northern Antarctic Peninsula using teleseismic P waves. The data came from the seven land stations of the Seismic Experiment in Patagonia and Antarctica (SEPA)campaigned during 1997-1999, a permanent IRIS/GSN station (PMSA), and 3 seismic stationsinstalled at scientific bases, Esperanza (ESPZ), Jubany (JUBA), and King Sejong (KSJ), inSouth Shetland Islands. All of the seismic stations are located in coast area, and the signal to noise ratios (SNR) are very low. The P-wave model was inverted from 95 earthquakes resulting in 347 ray paths with P- and PKP-wave arrivals. The inverted model shows a strong low velocity anmaly beneath the Bransfield Strait, and a fast anomaly beneath the South Shetland Islands. The low velocity anomaly beneath the Bransfield might be due to a back arc extension, and the fast velocity anomaly beneath the South Shetland Islands could indicates the cold subducted slab.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/28498
Bibliographic Citation
2010 AGU Fall Meeting, pp.T21D-21, 2010
Publisher
AGU
Type
Conference
Language
English
Publisher
AGU
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