3dimensional GPR applied to archeological survey and mitigation of natural disastres
GPR (Ground Penetrating Radar) technology has been widely accepted as shallow geophysical exploration method. We have developed 3DGPR system, which uses high-accuracy positing information together with GPR data actuation, and have demonstrated that it can obtain subsurface 3-dimensional GPR images much clear than conventional GPR surveys. We have applied this method to some archaeological sites in Japan, including Sitobaru, Sakitama and Zuiganji. We could demonstrate that it is not only detection, but also can image subsurface structures. After the 3.11 Great East Japan Earthquake and Tsunami, we have used this method for understanding the geological anomalies caused by the earthquakes.
Archaeological Survey of Dangoyama Kofun by 3DGPR
We presented a three-dimensional ground penetrating radar (3DGPR) system for the archeological investigation in a harsh site, where we have to deal with many trees and/or great topographic variations. This system consists of a commercial GPR system with a laser positioning system. With this system, we can move the GPR antenna freely, on which a positioning detector can record accurate position for each GPR data trace. We applied our 3DGPR system at Dangoyama Kofun, a burial mound, in Fukushima prefecture, Japan. A lot of trees and bushes covered the survey area and cannot be cut. We acquired six datasets in two days in this area. We successfully imaged the boundary between the original surface of the burial mound and the covering soil clearly at about 0.3 m depth around the mound. Furthermore, we found some strong reflections appeared at 0.8 m depth in the top area of the mound, which can be from the artificial parts of the burial mound. The results would greatly aid the following archaeological excavation. In addition, we compared the non-interpolated depth slice with interpolated depth slice at same position and demonstrated that the interpolation process on threedimensional GPR data may introduce some artifacts which might mislead our interpretation.
Natural history and long‐term evolution in families with autosomal dominant cortical tremor, myoclonus, and epilepsy
Purpose:  To investigate for the first time the natural history and long‐term evolution of “familial cortical tremor, myoclonus, and epilepsy.”