Japan Geoscience Union Meeting 2016

Presentation information


Symbol S (Solid Earth Sciences) » S-TT Technology & Techniques

[S-TT52] Airborne surveys and monitoring of the Earth

Mon. May 23, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Shigekazu Kusumoto(Graduate School of Science and Engineering for Research, University of Toyama), Shigeo Okuma(Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST)), Takao Koyama(Earthquake Research Institute, University of Tokyo), Yuji Mitsuhata(AdvancedIndustrial Science and Technology)

5:15 PM - 6:30 PM

[STT52-P05] Relationship between Resistivity Distributions by Airborne Electromagnetic Method and Underground Structure

*Teruyoshi Takahara1, Shuji SETO1, Kohei NOIKE1, Kayoko MORI1, Atsuhiko KINOSHITA1, Hideaki MIZUNO1, Katsushi KAWATO2, Minoru OKUMURA2, Ryota KAGEURA2 (1.Public Works Reserch Institute, 2.Nippon Engineering Consultants Co.,LTD.)

Keywords:Deep-seated Catastrophic Landslide, Airborne Electromagnetic Method, Resistivity

Frequency of Deep-seated catastrophic landslide is less. However, this phenomena have potential to add serious damage by a lot of sediment. Therefore, it is important to develop extraction method of scale and areas tending to cause deep-seated catastrophic landslide. In previous studies, they studied about how to estimate depth of collapse in the areas tending of cause deep-seated catastrophic landslide using airborne electromagnetic method. As these results, in the areas of past deep-seated catastrophic landslide, it confirmed that there were values of high resistivity at shallow layer. However, there are lack of further studies that how resistivity is affected by geology and groundwater. Therefore, purpose of this study is to understand relationship between resistivity distributions and underground structure.First, we created figures of resistivity distributions of airborne electromagnetic method in pluvial period and not pluvial period. Then, we compared these figures. Next, we estimated groundwater level in studies areas using results of borehole surveys. Last, we compared figures of resistivity distributions and estimated water level. Then, we considered about relationship resistivity distributions and groundwater level.In this study, it was found that the following. In pluvial period, ground plan of resistivity distributions have many low resistivity than not pluvial period. Then, in pluvial period, it confirmed that changes zone of resistivity were unclear. Therefore, it confirmed that there was difference in distribution of resistivity between pluvial period and not pluvial period. It is assumed that groundwater distribution are affected. Then, it confirmed that changes zone of resistivity were generally consistent with ground water level by results of compared with cross section of resistivity and borehole.