Journal of the Geodetic Society of Japan

Common-mode Errors in the GPS Coordinates Time Series?\

-Application of Spatial Filtering Technique-

Takao Tabei, Amin W.L.

2002 Volume 48 Issue 4 Pages 229-241
Published: December 25, 2002
Released on J-STAGE: March 01, 2011

DOIhttps://doi.org/10.11366/sokuchi1954.48.229

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Gravity Anomaly Distribution and 3-D Density Structure in the Chugoku and Shikoku Districts, Southwest Japan

Akio Shiota, Ichiro Ohno, Ryuichi Shichi, Hideki Murakami, Hiroaki Kom ...

2002 Volume 48 Issue 4 Pages 243-257
Published: December 25, 2002
Released on J-STAGE: July 05, 2011

DOIhttps://doi.org/10.11366/sokuchi1954.48.243

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Gravity data measured at '9, 500 stations in the Chugoku and Shikoku districts, south west Japan, were used to construct a detailed contour map of the regional Bouguer anomaly . We performed a crustal density inversion of the Bouguer anomaly data by means of a damped least squares method combined with singular value decomposition over a 280 km×180 km area. The resultant three-dimensional density structure reveals the following features: a low density, elongate belt along the Median Tectonic Line from Kyushu to east Shikoku; a high density structure beneath the central Seto Inland Sea; a lowdensity structure with local minima distributed widely beneath Chugoku; high-density belts beneath Shikoku corresponding to known geologic structures of the Sanbagawa and Mikabu belts.

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Co- and Post-seismic Crustal Deformation of the 1946 Nankai Earthquake Deduced from Tide Gauge Records

Akio Kobayashi, Akio Yoshida, Norihiro Manago

2002 Volume 48 Issue 4 Pages 259-270
Published: December 25, 2002
Released on J-STAGE: March 01, 2011

DOIhttps://doi.org/10.11366/sokuchi1954.48.259

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We examined tide gauge records at stations in the Kii Peninsula and western Shikoku to elucidate vertical crustal deformation at and after the 1946 Nankai earthquake as precisely as possible. First, we eliminated effects of atmospheric pressure and astronomical tide from the data of daily mean sea level. Next, we tried to remove influences of oceanic current by taking differences of the corrected data between two stations . Having conducted those data processing, we found that notable crustal deformation followed after the Nankai earthquake and it lasted several years at Uragami and Shimotsu in the Kui Peninsula . The relaxation time of the deformation differs considerably from that observed in Shikoku, which suggests that the post seismic deformation in the Kui Peninsula and that in Shikoku were caused by separate after slips with different relaxation times.

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