Japan Geoscience Union Meeting 2016

Presentation information

International Session (Poster)

Symbol M (Multidisciplinary and Interdisciplinary) » M-TT Technology & Techniques

[M-TT05] Cryoseismology - a new proxy for detecting surface environmental variations of the Earth -

Thu. May 26, 2016 3:30 PM - 4:45 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Masaki Kanao(National Institute of Polar Research), Seiji Tsuboi(JAMSTEC, Center for Earth Information Science and Technology), Takeo Ito(Earthquake and Volcano Research Center, Graduate School of Environmental Studies, Nagoya University), Douglas Wiens(Washington University in St Louis), Sridhar Anandakrishnan(Penn State University), Jeremy Winberry(Central Washington University), Kent Anderson(Incorporated Research Institutions for Seismology)

3:30 PM - 4:45 PM

[MTT05-P06] Seismic observations in Greenland by a joint USA and Japanese GLISN team (2011-2015)

*Genti Toyokuni1, Dean Childs2, Masaki Kanao3, Yoko Tono4, Tetsuto Himeno5, Seiji Tsuboi6 (1.Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University, 2.IRIS PASSCAL Instrument Center, 3.National Institute of Polar Research, 4.Ministry of Education, Culture, Sports, Science and Technology, 5.Faculty of Economics, Shiga University, 6.Japan Agency for Marine-Earth Science and Technology)

Keywords:Greenland, Seismic observation, ice sheet

Global climate change is currently causing melting of the Greenland ice sheet. Recently, a new type of seismic event, referred to as a “glacial earthquake”, has been recognized. Such earthquakes are generated by the movements of large masses of ice within the terminal regions of glacier, and represent a new approach for monitoring ice sheet dynamics. In 2009, the GreenLand Ice Sheet monitoring Network (GLISN) was initiated as international project to monitor changes in ice sheet by constructing a large broad-band seismological network in and around Greenland.

Japan is a partner country from when the GLISN project was launched, and has been sending an expedition team every year since 2011. In 2011, the joint USA and Japanese GLISN team installed the dual seismic–GPS station ICESG-GLS2 in the middle of the Greenland ice sheet. During 2012-2015, we conducted maintenance of the three stations on ice (ICESG-GLS2, DY2G-GLS1, and NEEM-GLS3), and three stations on bedrock in coastal region (NUUK, DBG, and SOEG).

Especially, in 2014, we had succeeded in real-time transmission of broad-band continuous seismic waveform data from the three ice stations. It was the first time in the world that the seismic data with such a high sampling rate is transferred from the ice sheet. The data is now open to the public and available from the IRIS Data Management Center (http://www.iris.edu/ds/nodes/dmc/). Also in 2015, we relocated a seismic sensor at the station ICESG, which had been covered by snow of 5 m depth due to accumulation for four years. All of the excavation and reinstallation processes were achieved within two days by human labor of only three workers.

This presentation will summarize our field activities, and introduce the future plans. The Japanese GLISN team has been supported by JSPS KAKENHI 24403006.