Interim Sediment Disaster Warning Rules After Shizuoka Earthquake
Overview
The earthquake in western Shizuoka Prefecture at around 1:04 a.m. on November 8, 2026, registered a maximum seismic intensity of 5+ in Aichi Prefecture. In areas where shaking was strong, the ground may have become more fragile, making the risk of rain-induced sediment disasters higher than usual. Chita City in Aichi Prefecture will therefore apply interim criteria for issuing sediment disaster warnings and related alerts, set at 80% of the usual criteria, for the time being. The relationship between rainfall after the earthquake and sediment disasters will be investigated, and the criteria will be revised as needed.
Key points
- The earthquake in western Shizuoka Prefecture at around 1:04 a.m. on November 8, 2026, registered a maximum seismic intensity of 5+ in Aichi Prefecture.
- Chita City will apply interim criteria set at 80% of the usual criteria.
- The interim operation will continue for the time being, and the criteria will be revised as needed.
Overview
Because the ground may have become more fragile in areas where shaking was strong, and the risk of rain-induced sediment disasters is considered higher than usual, measures will be taken to increase vigilance beyond normal levels.
Details
The criteria for issuing the Level 4 Sediment Disaster Danger Warning, Level 3 Sediment Disaster Warning, and Level 2 Sediment Disaster Advisory will be subject to the interim criteria in Chita City, Aichi Prefecture.
The Level 3 Sediment Disaster Warning uses the same criteria values as the Level 4 Sediment Disaster Danger Warning.
The relationship between rainfall after the earthquake and sediment disasters will continue to be investigated, and the interim criteria will be revised as needed.