Yasunori Hada

Tsunami run-up heights of the 2003 Tokachi-oki earthquake

Tsunami height survey was conducted immediately after the 2003 Tokachi-oki earthquake. Results of the survey show that the largest tsunami height was 4 m to the east of Cape Erimo, around Bansei-onsen, and locally at Mabiro. The results also show that the tsunami height distribution of the 2003 Tokachi-oki earthquake is clearly different from that of the 1952 Tokachi-oki earthquake, suggesting the different source areas of the 1952 and 2003 Tokachioki earthquakes. Numerical simulation of tsunami is carried out using the slip distribution estimated by Yamanaka and Kikuchi (2003). The overall pattern of the observed tsunami height distribution along the coast is explained by the computed ones although the observed tsunami heights are slightly smaller. Large later phase observed at the tide gauge in Urakawa is the edge wave propagating from Cape Erimo along the west coast of the Hidaka area.

Field Survey of the 2003 Tokachi-Oki Earthquake Tsunami and Simulation at the Ootsu Harbor Located at the Pacific Coast of Hokkaido, Japan

Field survey for the 2003 Tokachi-oki earthquake tsunami was conducted by the scientists from all over Japan [Tanioka et al., 2004a, b]. Large tsunami heights of about 4 m were observed at Hyakuninhama to the east of Cape Erimo and along the beach between Horokayanto and Oikamanai. Those places are close to the source region of the earthquake. In general, tsunami heights gradually decreased to the east and to the west away from those two locations except at Mabiro where a large tsunami height of about 4m was locally observed. The most intensive tsunami survey was conducted at the Ootsu harbor. The survey results indicate that the quay of the harbor was completely submerged by the tsunami, but the road around the harbor was not. Numerical computation of the 2003 Tokachi-oki tsunami was carried out by solving the nonlinear shallow water equations with a moving boundary condition near the Ootsu harbor. The computed tsunami at the Ootsu harbor well explains the above observations.

Development of IT Triage System （TRACY） to Share Regional Disaster Medical Information

We developed an IT (Information Technology) triage system for collecting disaster medical information in real time. FeliCa cards and card readers are used to obtain the number and condition of patients. The system is composed of two elements. First, the number of patients for each triage level and the accepted number of patients in each diagnosis and treatment department are obtained in real time, including response for changing triage level. Second, this information is shared in real time among hospitals, the administration, and residents who are searching for their family. A disaster drill utilizing this system was held at the University of Yamanashi Hospital with 450 participants. From the result of that, the present system could work for those two elements. TRACY was examined its availability and practicability in this drill.

A STUDY ON ROAD INFORMATION SHARING USING PROBE VEHICLE DATA IN DISASTERS

Road information sharing is vital in disaster response, but it still remains today a significant problem in spite of the recent breakthrough of information and communication technology. In this study, we overview the present situation and structure problems on road information sharing. Two main problems are as follows: i) how to gather the information about which road can be used and ii) how to share the information among different disaster information systems used in the authorities concerned. We propose road information sharing using probe vehicle data to solve the first problem. The characteristics and the possible use of the GIS plotted probe vehicle data in past disasters are discussed. The probe vehicle data provide information to decide which road are likely to remain available at the time, and also where the vehicle turned around, that indicates the road might not be available. The travel time of individual car trips are numerically simulated with and without road information sharing among the cars. The reductions of the travel time depend on numbers of probe cars and road closures. The simulation results indicate that the probe vehicle data can be effectively used to reduce the travel time in a time of disaster, and to gather regional information on available roads.