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最終更新日：2011年11月2日


Overview of the Research Project   A Flowchart of Research Plans



  This project aims to develop systems for determining and transmitting seismic parameters using seismic data, which are collected through the nationwide earthquake monitoring networks. The information is to be telemetered to users, such as the administrative organizations concerned, private companies and the general public in order to take effective disaster mitigation measures immediately after the occurrence of earthquakes.

  NIED is developing the Realtime Earthquake Information System (REIS) that will enable the organizations and people concerned to take substantial disaster mitigation measures rapidly, such as protecting and mitigating damage to life lines, high-precision processing lines and human lives by transmitting seismic data that are from the nationwide networks of high-sensitivity seismographs (Hi-net), broad-band seismographs (F-net) and strong-motion seismographs (K-NET). The primary information is focal parameters (origin time, hypocenter and magnitude): the system will determine those parameters within several seconds after seismic wave arrival at the nearest station. The information includes CMT solution, rupture propagation direction, aftershock distribution, focal mechanism, stress drop and changes in Coulomb's failure function. Another theme is to develop and implement systems for transmitting the information in the form requested by particular users.

  The Real-time Earthquake Information Consortium (REIC) has been established, consisting of public organizations, private companies, specialists and users related to the production and utilization of real-time earthquake information. The consortium is promoting the establishment of environments to enable information to be transmitted in such a way that end users can take effective disaster mitigation measures. Consequently, this project covers an entire range of areas including data analysis, information transmission and utilization of transmitted earthquake information.













* Fiscal 2001   * Planned to be developed in Fiscal 2002   * Other projects
Sub-theme
 Theme Present level Goal (2005) Methods and Data Notes
Realtime Analyzing Systems Hypocenter (location, magnitude) In approximately 40 seconds
Accurate		 15 seconds
Accurate		 Noise Reduction
Other Data		 Realtime Damage Evaluation (RDE)
Emergency Control
CMT solution In approximately 20 minutes 3 minutes Hypocenters by Hi-net Realtime strong motion evaluation
Emergency Control
Rupture direction Manual Realtime P wave period, Amplitude Improving RDE
Evaluating systems for aftershock Aftershock distribution Difficult for swarms Accurate Determination Realtime Swarm Mode Aftershock Area
Estimation of Rupture Area
Mechanism Ambiguity
Several tens/ month
Realtime		 Accurate
Over 1,000 / month
Realtime		 Polarity of P wave and P wave amplitude of P and S waves Simultaneous identification of characteristics of the site utilizing S wave amplitude Stress Distribution
Stress Drop M3.5 or more (several events a month) Quasi-realtime (several hundreds a month) Joint determination of fault parameters and site effect Simultaneous spatial distribution of stress drop
CFF Quasi-realtime Realtime Real-time systems Estimation of aftershock prone area


National Research Institute for Earth Science and Disaster Prevention