*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.