松本盆地南部のGPS地殻変動観測(1992-2012)

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Since 1992, geodetic measurements with GPS have been taken in the southern area of the Matsumotobasin, Nagano Prefecture, central Japan. The Matsumoto basin is located on the Itoigawa-ShizuokaTectonic Line, which has recently been regarded as a plate boundary between the Eurasian plate and theNorth American plate. The GPS network of Shinshu University, established along the Itoigawa-ShizuokaTectonic Line, consists of four observation stations: Shinshu University, Muroyama, Nakayama, andMatsumoto City Hall. The observed data were analyzed using broadcast ephemeris and defaultmeteorological values with the double-difference technique.From the present GPS measurements, it was found that, during the period from 1992 to 2010, thedistance between Muroyama and Shinshu Universityabout 12km in the east-west directioncontracted4cm (4ppm). Subsequently, during the three years from 2010 to 2012, the temporal change of the baselinelength between Muroyama and Shinshu University showed an extension of 4cm (4ppm). In particular, thesteep change of the baseline length between them showed an extension of 1.5cm following the massiveTohoku Earthquake, with a magnitude of 9.0 on March 11, 2011. The distance between Nakayama andShinshu Universityabout 6km in the north-south directionextended 1cm (2ppm) during the periodfrom 1992 to 2010. Subsequently, in 2011, it contracted 1.5cm following the Naganoken Chubu Earth-quakes, with magnitudes of 5.4 and 5.1, on June 30, 2011, which struck Matsumoto city. Crustal deformationin the southern area of the Matsumoto basin, Nagano Prefecture during the last twenty years, 1992-2012,is reported and discussed in the present study
2013-05-31

松本盆地南部のGPS地殻変動観測(1992-2012)

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