![]() ![]() ![]() The National Research Institute for Earth Science and Disaster Resilience (NIED) manages a V-net at 16 volcanoes as a standard volcano observation network, equipped with a borehole high-sensitivity velocity seismometer, borehole tiltmeter, broadband seismometer, and Global Navigation Satellite System (GNSS). Universities also operate observation networks at some active volcanoes for academic research. The Japan Meteorological Agency (JMA) is responsible for issuing warnings and conducts volcanic observation at 50 volcanoes for the purposes of monitoring. ![]() We have various kinds of data from observation networks. In this paper, we will summarize the outline of our ongoing project of JVDN database development. We have developed a basic platform to share and to realize static linkage of these for risk management (e.g., hazard maps) and dynamic linkage for crisis management (e.g., updating information about ongoing damage). For the countermeasure information, real-time evaluation of volcanic activity and outreach information such as movies of lectures will be provided based on the research in theme D ( Nakada et al., 2019).Ĭurrently, we are in the initial development stage of the JVDN database linking all of the observations, forecasting, and countermeasures, encompassing themes of A–D. For the forecasting topic, theme C focuses on geological, petrological data, and also numerical simulation of volcanic phenomena, the details of which are explained in sections “Geological and Petrological Data” and “Numerical Simulation Data” of this paper. Theme B produces the observational data in various categories, namely, Muon, InSAR, optical remote sensing, volcanic gas, and geophysical campaign observation. Details of the JVDN system are introduced in the next section. The design for the JVDN system and the data flow is shown in Ueda et al. JVDN plans to archive various kinds of data, that is, seismic, geodetic, geochemical, geological, and petrological data. The data-sharing system distributed by theme A is the Japan Volcanological Data Network (JVDN). This project consists of four themes, A: Developing a Data-Sharing System of Volcano Observation Data, B: Development of Cutting-edge Volcano Observation Technology, C: Development of Forecasting Technologies for Volcanic Eruptions, and D: Development of Volcano Disaster Countermeasure Technology. The Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan, has recently launched a new research project, entitled the “Integrated Program for Next Generation Volcano Research and Human Resource Development (INeVRH)” to run from 2016 to 2025. The observation section corresponds to the evaluation of volcanic activity, the forecast section corresponds to the branching of volcanic hazards, and the countermeasures section corresponds to the risk evaluation based on exposure and vulnerability. We categorize the event tree into three sections: observation, forecast, and countermeasures ( Figure 2). In this way, we try to provide more information more quantitatively about the probability of branching at the nodes, i.e., which way the situation will develop. The event tree systematizes a way to estimate the probabilities of various volcanic phenomena, of which nodes and branches express the subsequent relationships from prior events to final outcomes. We will construct event trees for volcanic crises using the method proposed by Newhall and Hoblitt (2002) as a standard tool for evaluating volcanic activity to assess hazards and risks as a part of crisis management planning. Our main goal is to build event tree frameworks during volcanic crises to estimate probabilities of possible outcomes of volcanic unrest, which is supported by observational datasets and numerical simulation results, as well as taking into account exposure and vulnerability data.
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