Matsushiro Seismological Observatory, Seismological research facility in Matsushiro, Nagano, Japan
The observatory operates advanced seismographs and monitoring equipment in underground tunnels stretching across three kilometers beneath Mount Zozan.
Founded in 1947, the facility repurposed military tunnels from World War II, transforming them into specialized chambers for earthquake monitoring.
The observatory contributes to Japan's earthquake preparedness system by collecting and analyzing data from seismic events throughout the country.
Located 100 meters underground, the facility maintains constant temperatures and isolation from surface disturbances, enabling precise seismic measurements.
The observatory documented the Matsushiro earthquake swarm of 1965, recording up to 6,780 seismic events in a single day.
Location: Nagano
Inception: 1947
Website: https://data.jma.go.jp/svd/eqev/data/matsushiro
GPS coordinates: 36.54389,138.20611
Latest update: March 4, 2025 13:36
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