Abstract
Phase identification procedures for teleseismic events at Syowa Station (69.0°S, 39.6°E; SYO), East Antarctica have been carried out since 1967 after the International Geophysical Year (IGY; 1957-1958). Since the development of INTELSAT telecommunication link, digital waveform data have been transmitted to the National Institute of Polar Research (NIPR) for the utilization of phase identification. Arrival times of teleseismic phases, P, PKP, PP, S, SKS have been detected manually and reported to the International Seismological Centre (ISC), and published by “JARE Data Reports” from NIPR. In this paper, hypocentral distribution and time variations for detected earthquakes are demonstrated over the last four decades in 1967-2010. Characteristics of detected events, magnitude dependency, spatial distributions, seasonal variations, together with classification by focal depth are investigated. Besides the natural increase in the occurrence of teleseismic events on the globe, a technical advance in the observing system and station infrastructure, as well as the improvement of procedures for reading seismic phases, could all combine to produce the increase in detection of events in last few decades. Variations in teleseismic detectability for longer terms may be possible by association with the meteorological environment and seaice spreading area around the Antarctic continent. Recorded teleseismic and local seismic signals have sufficient quality for many analyses on dynamics and structure of the Earth as viewed from Antarctica. The continuously recorded data are applied not only to lithospheric studies but also to the Earth’s deep interiors, as a significant contribution to the Federation of Digital Seismological Networks (FDSN) from high southern latitude.
Highlights
In order to contribute to the global seismic network, teleseismic phase identification at Syowa Station in Antarctica (69.0 ̊S, 39.6 ̊E; SYO; Figure 1) has been carried out since 1967 [1] after the International Geophysical Year (IGY)
All information on arrival times of the detected phases has been reported to the International Seismological Centre (ISC) and the United States Geological Survey (USGS), and published as the “Japanese Antarctic Research Expedition (JARE) Data Reports (Seismology)” for every year [3,4,5]
Arrival times of teleseismic phases have been reported to ISC, and published as JARE Data Reports
Summary
In order to contribute to the global seismic network, teleseismic phase identification at Syowa Station in Antarctica (69.0 ̊S, 39.6 ̊E; SYO; Figure 1) has been carried out since 1967 [1] after the International Geophysical Year (IGY). All information on arrival times of the detected phases has been reported to the International Seismological Centre (ISC) and the United States Geological Survey (USGS), and published as the “JARE Data Reports (Seismology)” for every year [3,4,5] By using both the travel-times and waveforms of detected teleseismic events at SYO (Figure 2), a number of remarkable studies have been conducted; heterogeneous structure and dynamics of the Antarctic continent [6,7,8], the surrounding oceanic plate [9, 10], local and regional seismic activities [11,12,13], structure and dynamics of the Earth’s deep interiors [14,15,16,17,18].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
