Detection capability of teleseismic events recorded at Syowa Station, Antarctica: 1987-2007

A phase identifying procedure for the teleseismic events at Syowa Station (69.0°S, 39.6°E), Antarctica has been carried out since 1967 by use of analog and digital records of short- and long-period seismometers. After the establishment of an INTELSAT telecommunication link, several kinds of digital...

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Bibliographic Details
Main Author: Masaki Kanao
Format: Article in Journal/Newspaper
Language:English
Japanese
Published: National Institute of Polar Research 2010
Subjects:
Online Access:https://doi.org/10.15094/00009521
https://doaj.org/article/605b6b4bfdcd44e7a7d41648e11cd51d
Description
Summary:A phase identifying procedure for the teleseismic events at Syowa Station (69.0°S, 39.6°E), Antarctica has been carried out since 1967 by use of analog and digital records of short- and long-period seismometers. After the establishment of an INTELSAT telecommunication link, several kinds of digital data have been transmitted to the National Institute of Polar Research (NIPR) for the utilization of seismic phase identification. The arrival times of several phases, such as P, PKP, PP, S, SKS have been reported to the United States Geological Survey (USGS) and International Seismological Center (ISC), then published as the "JARE Data Reports (Seismology)". In this paper, hypocentral distribution and time variations for the detected earthquakes by monitoring observation at Syowa Station was studied in the 21 year period from 1987 to 2007 by using the published Data Reports. The epicental parameters were investigated in terms of focal depth dependency and seasonal trending in the threshold range of detectable magnitude. Moreover, the detection capability of teleseismic events in the southern hemisphere was discussed in comparison with global results derived from ISC data.