Matsushiro Seismological Observatory

Matsushiro Seismological Observatory is a research facility buried beneath the surface in Nagano, Japan. It uses advanced seismographs positioned in underground tunnels stretching three kilometers under Mount Zozan to measure and record earthquake activity.

The facility was founded in 1947 by repurposing military tunnels left from World War II into specialized measurement chambers. This transformation from wartime infrastructure to scientific research marked a significant turning point in Japan's approach to earthquake understanding.

The facility serves Japan's ongoing effort to understand and prepare communities for seismic activity. This work helps scientists recognize patterns in earthquakes and share knowledge that keeps people safer during natural disasters.

The underground location, about 100 meters deep, provides constant temperatures and isolation from surface disturbances for accurate readings. Visitors should expect a cool, stable environment where the depth helps prevent natural variations from affecting the sensitive instruments.

In the 1960s, the area experienced an unusual phenomenon when hundreds of earthquakes occurred in rapid succession over a short period. This intense seismic episode was carefully recorded and provided scientists with rare insights into underground activity.

Location: Nagano

Inception: 1947

Website: https://data.jma.go.jp/svd/eqev/data/matsushiro

GPS coordinates: 36.54389,138.20611

Latest update: December 10, 2025 20:04