Japan Geoscience Union Meeting 2016

Presentation information


Symbol G (General (Education and Outreach)) » General (Education and Outreach)

[G-02] Comprehensive disaster prevention education

Sun. May 22, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Hitoshi Nakai(Kobuchisawa Research Institute for Nature and Education), Satoshi Miyajima(Saitama prefectural Fukaya dai-ichi High School), Hiroo Nemoto(J.F.Oberlin University)

5:15 PM - 6:30 PM

[G02-P01] 3D modelling for digital archive of monuments that records historical Nankai earthquakes at Kochi Prefecture

*Wataru Tanikawa1, Uramoto Go-Ichiro1, Shoichiro Uchiyama2, Arata Orinaka3, Tadashi Yamashina3, Keisuke Okamoto4, Tadashi Hara3 (1.Japan Agency for Marine-Earth Science and Technology, Kochi Instutute for Core Sample Research, 2.National Research Institute for Earth Science and Disaster Prevention, 3.Kochi University, 4.Kochi Prefectural Museum of History)

Keywords:stone monument, digital archive, education for disaster prevention, Nankai Earthquake, SfM-MVS

Nankai earthquakes have occurred repeatedly along southwest Japan. In Kochi Prefecture, historical disasters about the great Nankai earthquakes are recorded in the local stone monuments. There are at least 25 monuments in Kochi Prefecture which are related to Nankai earthquakes from Hoei (in 1707) to Showa (in 1946) era, and especially the most monuments are related to the Ansei Tokai and Ansei Nankai great earthquakes (in 1855). The earthquake monuments are regarded not only as memorial and cenotaph but also as highly valuable historical documents. However, weathering by wind, rain, and vegetation could have damaged the stone monuments and made us difficult to read the several characters on them. In addition, most of the monuments in Kochi Prefecture, which are owned by local people and temples, not by public institutions, have to be conserved individually. Therefore, we may lose the stone monuments by natural disasters such as future Nankai earthquakes.
In this project, we construct three-dimensional digital images of the stone monuments for the preservation of the historical records on the earthquake monuments in Kochi Prefecture, and provide information that links the moments and location on the web browser. We then promote to use our content as an education for disaster prevention so that the future generation can inherit the disastrous earthquake history.
The stone monuments have been researched mainly in deciphering the content of the characters engraved on the stones. However, rock physical/chemical properties (such as mineral composition, color, and magnetic susceptibility) and shapes also contain the cultural background at the era when the monuments were built. Therefore, in this project, we construct the three-dimensional digital image of the monuments and measure the rock physical/chemical properties, and then, to publish the information on the web.
We used the commercial software (PhotoScan, Agisoft company) to reconstruct 3D models from digital photo images. Photos were taken by compact digital camera (GR, RICOH imaging company). We plan to view 3D images on web or ask to download to personal computers. Large numbers of face are necessary to display the characters on monuments clearly, though, it may take time to display in browser. Therefore we use the existing platform (Sketchfab, https://sketchfab.com/) that can display and share 3D models based on the WebGL technology. 3D pdf were chosen as format to view 3D models on PC. Spectrophotometer (CM-700d, KONICA MINOLTA Inc.) were used to measure the color, and magnetic susceptibility were measured by KT-10 S/C (Terraplus inc.).
In this presentation, we report our project on progress and preliminary data.