NIED Hi-net is a high-sensitivity seismograph network consisting of nearly 800 stations with an average spacing of 20 km. The seismometers are installed at the bottom of boreholes at a depth of 100-3500 m to reduce noise caused by winds, ocean waves, and human activity. Observed data is digitized at each station and continuously transmitted to NIED.
Summary of NIED Hi-net
http://www.hinet.bosai.go.jp/summary/
Station dataset (Japanese website)
http://www.hinet.bosai.go.jp/st_info/detail/dataset.php
Response of observation equipment (For registered users)
https://hinetwww11.bosai.go.jp/auth/seed/
データ公表機関
防災科学技術研究所
データ公表機関(英)
National Research Institute for Earth Science and Disaster Resilience