Key Facts
• Japan Meteorological Agency issued tsunami observation info at 00:18 on July 31.
• Tsunami height may increase beyond observed levels; maximum waves may take hours to arrive.
• Observations as of 00:16:
– Eastern Hokkaido Pacific Coast: Nemuro City, max height 0.8m at 14:57 on July 30.
– Central Hokkaido Pacific Coast: Erimo Town, max height 0.6m at 21:14 on July 30.
– Western Hokkaido Pacific Coast: Tomakomai East Port, max height 0.5m at 19:04 on July 30.
– Aomori Prefecture: Hachinohe Port, max height 0.8m at 19:16 on July 30.
– Iwate Prefecture: Kuji Port, max height 1.3m at 13:52 on July 30.
– Miyagi Prefecture: Sendai Port, max height 0.9m at 23:20 on July 30.
– Fukushima Prefecture: Soma, max height 0.7m at 21:57 on July 30.
– Tokyo Bay: Yokohama, max height 0.3m at 13:40 on July 30.
– Shizuoka Prefecture: Shimoda Port, max height 0.6m at 00:06 on July 31.
Summary
The Japan Meteorological Agency released tsunami observation data at 00:18 on July 31. Tsunami waves may take hours to reach their maximum height, and some areas could experience waves higher than initially observed. Key observations include a 1.3m wave at Kuji Port in Iwate Prefecture and a 0.9m wave at Sendai Port in Miyagi Prefecture. Updates indicate a 0.6m wave at Shimoda Port in Shizuoka Prefecture as of 00:06 on July 31. Residents in affected areas are advised to remain vigilant as conditions may change.
