A seismic refraction experiment in 2000 on the Mizuho Plateau, East Antarctica (JARE-41) -Outline of observations-

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 wit...

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Bibliographic Details
Main Authors: Hiroki Miyamachi, Hiroshi Murakami, Tomoki Tsutsui, Shigeru Toda, Toshiaki Minta, Morio Yanagisawa
Format: Article in Journal/Newspaper
Language:English
Japanese
Published: National Institute of Polar Research 2001
Subjects:
Online Access:https://doi.org/10.15094/00009155
https://doaj.org/article/1d8f676e471340bb83df86849de1ca8a
Description
Summary: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.