Department of Earth and Environmental Sciences, Faculty of Science, Kagoshima University/Earthquake Observation Research Technology Center/Department of Earth Science and Technology, Faculty of Engineering and Resource Science, Akita University/Department of Earth Sciences, Faculty of Education, Aichi University of Education/Nippon Oil and Fats Co., Ltd/National Institute of Polar Research
A seismic refraction experiment was successfully conducted along the S17-Z20 profile on the Mizuho route, in East Antarctica, in the austral summer season of 1999-2000 (JARE-41). One hundred sixty seismic stations were temporarily installed along the profile about 180km long and five large shots with dynamite of about 600kg were fired. In addition, two shots with charge sizes of 250kg and 25kg were arranged along the profile. The obtained seismic records show the clear onsets of the first arrivals in a distance range of less than 100km from each large shot. In particular, seismic waves traveling through the ice sheet and the dispersed surface waves are distinctly observed. Some later phases are also detected. The first travel time data obtained show that a P-wave velocity in the ice sheet is 3.6-3.8km/s and an apparent velocity in the rock basement just beneath the ice sheet is almost 6.2km/s. This report describes the basic outline of the experiment and the seismic data obtained.
東南極みずほ高原における屈折法地震探査実験-第41次夏期観測概要-
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KJ00000140563
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概要
