GPS/Acoustic seafloor geodetic observation: method of data analysis and its application

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概要

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• We have been developing a system for detecting seafloor crustal movement by combining kinematic GPS and acoustic ranging techniques. A linear inversion method is adopted to determine the position of seafloor stations from coordinates of a moving survey vessel and measured travel times of acoustic waves in seawater. The positioning accuracy is substantially improved by estimating the temporal variation of the acoustic velocity structure. We apply our method to the ranging data acquired at the seafloor reference point, MYGI, located off Miyagi Prefecture, in northeast Japan, where a huge earthquake is expected to occur in the near future. A time series of horizontal coordinates of MYGI obtained from seven campaign observations for the period 2002-2005 exhibits a linear trend with a scattering rms of about 2 cm. A linear fit to the time series gives an intraplate crustal velocity of more than several centimeters per year towards the WNW, which implies strong interplate coupling around this region. The precision of each campaign solution was examined at MYGI and other seafloor reference points along the Nankai Trough through comparison of independent one-day subset solutions within the campaign. The resultant repeatability looks to be well-correlated with the temporal and spatial stability of the acoustic velocity structure in the seawater depending on the region as well as the season.

• 公益社団法人 日本地震学会、地球電磁気・地球惑星圏学会 、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会の論文

著者

• Colombo Oscar

  G.e.s.t./nasa Goddard Space Flight Center

• Kawai Koji

  Hydrographic And Oceanographic Department Japan Coast Guard

• Katayama Masato

  Hydrographic And Oceanographic Department Japan Coast Guard

• Toyama Shin-ichi

  Hydrographic And Oceanographic Department Japan Coast Guard

• Yabuki Tetsuichiro

  Hydrographic And Oceanographic Department Japan Coast Guard

• Ishikawa Tadashi

  Hydrographic And Oceanographic Department Japan Coast Guard

• Fujita Masayuki

  Hydrographic And Oceanographic Department Japan Coast Guard

• Sato Mariko

  Hydrographic And Oceanographic Department Japan Coast Guard

• Asada Akira

  Instilute Of Industrial Science University Of Tokyo

• Mochizuki Masashi

  Institute Of Industrial Science The University Of Tokyo

• Matsumoto Yoshihiro

  Hydrographic And Oceanographic Department Japan Coast Guard

• Mochizuki Masashi

  Institute of Industrial Science, University of Tokyo

関連論文

• Noncontact power supply for seafloor geodetic observing robot system
• Estimated pressure source on Kozu Island volcano, South Central Japan, from GPS measurements (July 1996-August 1999)
• Undersea crustal movement off the Tokai District, central Japan, detected by GPS/Acoustic seafloor geodetic observation
• Undersea co-seismic crustal movements associated with the 2005 Off Miyagi Prefecture Earthquake detected by GPS/acoustic seafloor geodetic observation
• GPS/Acoustic seafloor geodetic observation : method of data analysis and its application
• Automated acoustic method for counting and sizing farmed fish during transfer using DIDSON
• New USB-based 3D digital echo sounder system for mapping and assessing fish and aquatic plants
• Weak interplate coupling beneath the subduction zone off Fukushima, NE Japan, inferred from GPS/acoustic seafloor geodetic observation
• Centimeter-level positioning on the seafloor
• Synthetic aperture technique applied to a multi-beam echo sounder
• Assessing the biomass and distribution of submerged aquatic vegetation using multibeam echo sounding in Lake Towada, Japan
• Undersea co-seismic crustal movements associated with the 2005 Off Miyagi Prefecture Earthquake detected by GPS/acoustic seafloor geodetic observation
• GPS/Acoustic seafloor geodetic observation: method of data analysis and its application

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