Japan Geoscience Union Meeting 2014

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Oral

Symbol S (Solid Earth Sciences) » S-GD Geodesy

[S-GD21_28AM2] Geodesy General Contributions

Mon. Apr 28, 2014 11:00 AM - 12:45 PM 413 (4F)

Convener:*Kazuhiro Takashima(Geospatial Information Authority of Japan, Ministry of Land, Infrastructure, Transport and Tourism), Takahito Kazama(Graduate School of Science, Kyoto University), Chair:Tadafumi Ochi(Active Fault and Earthquake Research Center, Geological Survey of Japan, The National Institute of Advanced Industrial Science and Technology), Kazuyoshi Oichi(Hydrographic and Oceanographic Department, Japan Coast Guard)

12:15 PM - 12:30 PM

[SGD21-13] Vertical deformations revealed by laser scanning surveys in the Murono mud volcano

*Atsushi TAKAHASHI1, Yoichi FUKUDA1, Shigekazu KUSUMOTO2 (1.Graduate School of Science, Kyoto University, 2.Department of Earth Science)

Keywords:LaserRangeFinder, LaserScanningSurvey, Mud Volcano, Vertical Deformation, Mogi Model

In order to reveal the land surface deformation in the Murono mud volcano area located in Tokamachi city, Niigata prefecture, we have conducted the laser scanning surveys two times in June and October 2013, using TOPCON Imaging Station IS-301, which can obtain 3D point cloud data by the automatic laser scanning mode without reflector. In the same survey area, Toyama University has been conducting successive leveling surveys at 61 benchmarks so far. We also conducted the height measurements at the benchmarks using the precise ranging mode. The obtained cloud data have been interpolated on regular grids for the two data sets, respectively, and the surface deformation has been calculated by comparing the gridded data. The obtained result showed a clear concentric uplift pattern in a part of the survey area. We thus modeled the uplift using the Mogi source model. The maximum amplitude estimated from the model was about 1.5 cm and it was almost coincident with the uplift obtained at the nearest benchmark. The result showed that the scanning mode was really beneficial to search for the spatial deformation pattern and the source of the deformation as well, even though its accuracy would be lower than the one of the precise ranging mode.