首都圏地震観測網の設置計画

概要

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The Special Project for Earthquake Disaster Mitigation in the Tokyo Metropolitan Area has been ongoing (2007−2012). Under this project, the Metropolitan Seismic Observation network (MeSO-net), which consists of about 400 observation sites, has been constructed. This network consists of five dense linearly arrayed stations and evenly spaced stations. This five liner arrays focus on observing highly active seismicity, many repeating earthquakes, slow slip area, and historical large earthquakes. The correlations of waveform from local and teleseismic events are high because observation points are deployed at about 2 or 3-km intervals. In addition, identification of any stations of the later phase is easy even if artificial noise is very intense. These widely developed stations have been used effectively for the seismic tomography method. These dense intervals of MeSO-net will induce a more highly resolved structure than previous studies. MeSO-net has observed earthquakes of more than M 2.0. Low-frequency waveforms of less than 0.1 Hz have been observed by MeSO-net. The distribution of amplitudes observed at each station show heterogeneous amplification of shaking motions. Our study will lead to improved quality of plate structure, and contribute to a new assessment of seismic hazards in the Tokyo Metropolitan Area, Japan.
2010-01-28