The technique of radiographically imaging the internal structures of very large objects by utilizing muon's significant penetrating power (muography) enabled us to investigate the internal structures of volcanoes and city foundations with higher spatial resolution than is possible with conventional techniques.

This observation technique is applicable to exploring the internal states of large-scale civil engineering structures, bedrock, etc. However, the feasibility of applying muography to monitoring the inside of large-scale civil engineering structures has not been confirmed. As a test experiment, we are therefore currently investigating how groundwater and saturation levels in bedrock in a landslide area respond to major rainfall events.

Muographic measurement results will be compared with independent measurement results of groundwater levels and rock resistivity in order to quantitatively assess the technological limits of muography.

A muographic detector was installed at the observation site in August 2012. Measurements began on the same date.

Here, we explain the measurement data, comparative results, and observed results up to the present.

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