Japan Geoscience Union Meeting 2023

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[J] Oral

S (Solid Earth Sciences ) » S-GD Geodesy

[S-GD02] Crustal Deformation

Tue. May 23, 2023 9:00 AM - 10:15 AM 304 (International Conference Hall, Makuhari Messe)

convener:Masayuki Kano(Graduate school of science, Tohoku University), Tadafumi Ochi(Institute of Earthquake and Volcano Geology, Geological Survey of Japan, The National Institute of Advanced Industrial Science and Technology), Fumiaki Tomita(International Research Institute of Disaster Science, Tohoku University), Chairperson:Mako Ohzono(Institute of Seismology and Volcanology, Faculty of Science, Hokkaido University), Tadashi Yamasaki(National Institute of Advanced Industrial Science and Technology)

9:45 AM - 10:00 AM

[SGD02-04] Interference of two seasonally changing masses as seen from GRACE and GNSS: Case studies in the Gulf of Carpentaria and the Japan Sea

*Kosuke Heki1,2, Shuo Zheng3,4 (1.Department of Earth and Planetary Sciences, Faculty of Science, Hokkaido University, 2.Chinese Acad. Sci., Shanghai Astronomical Observatory, 3.University of Chinese Acad. Sci., 4.Chinese Acad. Sci., Inst. Geodesy Geophys.)

Keywords:Satellite gravimetry, Global Navigation Satellite System, seasonal crustal deformation, Australia, the Japan Sea

Tropical coastal regions move landward and oceanward during rain and dry seasons due to land hydrological loads, as observed with seasonal movements of GNSS stations. Here we use GNSS and GRACE data and present a few exceptional cases, i.e., GNSS stations move oceanward during rain seasons. In Northern Australia. stations along the coast of the Gulf of Carpentaria move oceanward during the rain seasons with significant phase shift between the peak subsidence and peak oceanward movement. We explain this as the interaction of two significant seasonally changing masses in ocean and land. The report also includes recent studies about seasonal mass changes in the Japan Sea and the Northeast Japan, characteristic seasonal crustal movements there, and significant concentration of earthquake occurrences along its eastern margin in May-July.