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Estimation of Near Surface Rock Property by Comprehensive Analysis of Gravitational and Geomagnetic Datasets
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 6th Asia Pacific Meeting on Near Surface Geoscience and Engineering, May 2024, Volume 2024, p.1 - 5
Abstract
Summary
Airborne surveys are widely conducted over the mountainous volcanic areas in Japan. Data are taken at short intervals and at low flight height. They have consequently enough high contents of short-wavelength components arising from the variations of rock properties in the near surface. They allow easily and efficiently to analyse the correlations among data within a narrow window. The satisfactory results in the area where serious landslides were triggered by the earthquake were obtained in estimating the density variations of near-surface by the analysis of the differential curvature of gravity-gradient tensor data together with the DEM data considering the topographical deviations relative to the measuring plane. For assessing more geological description of the hazardous areas in connection to the presence of volcanic rocks such as lava, intrusive rocks etc. in near-surface, the correlation of datasets between vertical gravity-gradient and reduction-to-pole magnetic intensity is applied to estimate the near -surface rock properties in the relatively large area surrounding the area where the landslides occurred. The results collectively reveal that the landslides occurred in the zones where the low-density deposits sit on locally convex surface and high slopes are present, however lava deposits seem not to be present.
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