JMA warned that areas hit by strong shaking face a heightened risk of building damage and landslides, especially if further rain falls. The agency urged people to avoid dangerous areas unless absolutely necessary.
Residents have been told to remain cautious for about a week, particularly over the first two to three days after the quake, as strong aftershocks can occur during that period. JMA said past cases show that earthquakes of a similar scale have followed major tremors in about 10-20% of cases.
In a separate joint notice, Yamanashi Prefecture and the Kofu Local Meteorological Office said the earthquake may have weakened the ground in Fujikawaguchiko and Otsuki. As a result, the criteria for issuing landslide-related warnings have been temporarily lowered: to 70% of normal levels for Fujikawaguchiko and 80% for Otsuki.
Otsuki city said it had recorded intensity 5-upper but, as of 11am on Saturday, had no reports of injuries, no power cuts and no water-supply damage. The city said no evacuation shelters were currently open after Otsuki Higashi Elementary School was closed as a shelter at 11am.
Officials also urged residents to watch transport updates. Otsuki city said the Fuji Kyuko Line, which had temporarily suspended operations, had resumed service, while JR Chuo Line services could face delays, destination changes or cancellations because of approaching storm conditions.
JMA’s current assessment for Mount Fuji states that volcanic activity remains quiet and unchanged. The volcano page lists no new alert upgrade following the Yamanashi earthquake.
The quake’s proximity to Mount Fuji has drawn public attention, but official information so far points to continued earthquake and landslide vigilance rather than a change in volcanic status.
Authorities are urging residents in strongly shaken areas to check for hazards around homes, avoid unstable slopes and keep following official weather, earthquake and local government updates over the coming days.
nippon.com , gdacs.org , digital.go.jp , data.jma.go.jp
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