The occasional earthquakes for which Japan is noted show up as larger movements. (steppestravel.com)
If the pore pressures are low (especially compared to the forces holding the rock together), then only the imbalance of natural in situ earth stresses will cause an occasional earthquake. (sciencedaily.com)
However, while the occasional earthquake in this state is typically small and insignificant, they can be a concern to area homeowners. (trustedchoice.com)