These stations measure fluctuations in the earth's electromagnetic field that correspond with seismic activity.

The raw geophysical time-series data from these monitoring stations is freely available to the scientific community, enabling further study of the interaction between EM events and earthquake activity.

[3] The building is called the Japanese water height reference point storehouse (日本水準原点庫, Nihon Suijun Genten Hyoko).

The stone base monument of the datum has a crystal scale with a 0 which indicates 24.3900 m (80.020 ft) above the mean sea level of Tokyo Bay since October 21, 2011.

[6] The GSI featured in the novel Norwegian Wood by Haruki Murakami as the intended workplace of his roommate, "stormtrooper".