https://repository.kopri.re.kr/handle/201206/5531 2026-04-16T06:53:28Z https://repository.kopri.re.kr/handle/201206/6573 Title: Installation of Very Broadband Seismic Stations to Observe Seismic and Cryogenic Signals, Antarctica Authors: Lee, Won Sang; Yun, Sukyoung; Park, Yongcheol; Yoon, Ho Il; Chae, Nam Yi; Choi, Hanjin; Yee, Tae-Gyu; Seo, Ki-Weon Abstract: Korea Polar Research Institute (KOPRI) has successfully installed two autonomous very broadband threecomponent seismic stations at the King George Island (KGI), Antarctica, during the 24th KOPRI Antarctic Summer Expedition (2010 ~ 2011). The seismic observation system is originally designed by the Incorporated Research Institutions for Seismology Program for Array Seismic Studies of the Continental Lithosphere Instrument Center, which is fully compatible with the Polar Earth Observing Network seismic system. The installation is to achieve the following major goals: 1. Monitoring local earthquakes and icequakes in and around the KGI, 2. Validating the robustness of seismic system operation under harsh environment. For further intensive studies, we plan to move and install them adding a couple more stations at ice shelf system, e.g., Larsen Ice Shelf System, Antarctica, in 2013 to figure out ice dynamics and physical interaction between lithosphere and cryosphere. In this article, we evaluate seismic station performance and characteristics by examining ambient noise, and provide operational system information such as frequency response and State-Of-Health information.. The seismic observation system is originally designed by the Incorporated Research Institutions for Seismology Program for Array Seismic Studies of the Continental Lithosphere Instrument Center, which is fully compatible with the Polar Earth Observing Network seismic system. The installation is to achieve the following major goals: 1. Monitoring local earthquakes and icequakes in and around the KGI, 2. Validating the robustness of seismic system operation under harsh environment. For further intensive studies, we plan to move and install them adding a couple more stations at ice shelf system, e.g., Larsen Ice Shelf System, Antarctica, in 2013 to figure out ice dynamics and physical interaction between lithosphere and cryosphere. In this article, we evaluate seismic 2012-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/6490 Title: The Origin of Double-Frequency Microseism and Its Seasonal Variability at King Sejong Station, Antarctica Authors: Lee, Won Sang; Seo, Ki-Weon; Yun, Sukyoung; Dong-Hoon Sheen Abstract: Korea Polar Research Institute has been operating a broadband seismic station (KSJ1) at the King George Island (KGI), Antarctica, since 2001. Examining ambient seismic noise level using power spectral analysis for the period of 2006-2008 at the KSJ1, we observed a seasonal pattern at 4-10 s period. The amplitude of double-frequency (DF) microseism reaches a peak in May. Correlation of the DF energy and its predominant period with significant ocean wave height and peak wave period models from the WAVEWATCH III, and polarization analysis consistently indicate that ocean swell in the Drake Passage is a possible source to excite the DF microseism at the KGI. We also found that the temporal variation of DF amplitude is coincident with the seasonal change of ocean acoustic ambient noise level around the KGI, which implies that incorporating long-term seismic and hydroacoustic noise information might give us an opportunity to figure out the characteristics of local climate variation near the Antarctic Peninsula. 2011-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/6526 Title: Observation of Underwater Earthquakes by Using a Hydroacoustic Monitoring System Authors: Lee, Won Sang Abstract: Substantial advances in seismograph technology enable us to precisely and extensively monitor earthquakes occurring everywhere in the world, yet underwater tectonic events have remained insufficiently studied due to a dearth of seismic networks in the oceans. Hydroacoustic monitoring allows the detection and the precise location of small submarine earthquakes and volcanic activity. Furthermore, through hydroacoustic observation, we are able to examine cryogenic signals, which are closely associated with changes in the polar environment, baleen whale calls, and catastrophic tsunamis.etworks in the oceans. Hydroacoustic monitoring allows the detection and the precise location of small submarine earthquakes and volcanic activity. Furthermore, through hydroacoustic observation, we are able to examine cryogenic signals, which are closely associated with changes in the polar environment, baleen whale calls, and catastrophic tsunamis. 2011-01-01T00:00:00Z