Offshore geodetic data conducive to the estimation of the afterslip distribution following the 2003 Tokachi-oki earthquake |
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| Institution: | 1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;2. Canada Centre for Mapping and Earth Observation, Natural Resources Canada, 560 Rochester Street, Ottawa, ON K1A 0E4, Canada;3. Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA;4. Earth Observatory of Singapore (EOS), Nanyang Technological University, 50 Nanyang Avenue, Singapore;5. Dept. of Remote Sensing and Geospatial Information Engineering, Southwest Jiaotong University, Chengdu 610031, China;6. COMET, School of Civil Engineering and Geosciences, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK;7. College of Marine Geosciences, Ocean University of China, Song Ling Road 238, Qingdao, Shandong Province, China |
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| Abstract: | A cable-based seafloor observatory located offshore of Hokkaido, Japan, provides the world's first direct observation of offshore post-seismic displacement. After removing thermal noise, this data is used to constrain the distribution of offshore afterslip from a great interplate earthquake (Mw 8.0) that occurred during 2003 along the southern Kuril Trench. A checkerboard resolution test showed a great contribution of the offshore data to improving the spatial resolution on the plate interface slip near the trench. The 1-yr afterslip is distributed in a U-shaped pattern encircling its co-seismic slip area. This result indicates that the stick-slip frictional properties of the plate interface are distributed in a patch-like pattern as opposed to a banding pattern as previously assumed in young subduction zones. |
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