A 6.6 magnitude earthquake struck the western Pacific Ocean near Torishima in the Izu island chain, triggering tsunami advisories in the region. The quake occurred at 11 a.m. local time at a depth of 10 kilometers on October 5. Initially, the Japan Meteorological Agency issued a tsunami advisory, forecasting waves of up to 1 meter for the remote island chain located south of Tokyo. However, the advisory has since been lifted.
Residents in coastal areas and near river mouths were urged to move to higher ground to ensure their safety. The agency emphasized that even a seemingly small 1-meter wave could be perilous and sweep individuals off their feet.
While the tsunami was initially predicted to arrive at various times on the Izu islands, reports indicated that tsunami waves measuring up to 30 cm in height were observed on at least one of the islands. The agency noted that wave heights could have been greater at other locations.
The Japan Meteorological Agency also warned of the possibility of aftershocks, estimating a 10% to 20% chance of a similar-magnitude earthquake occurring in the coming week. Residents were urged to remain vigilant.
Despite the earthquake, there have been no reports of unusual volcanic activity as a result of the seismic event. However, cloud cover has made it challenging to confirm volcanic conditions. Aerial observations by the Japan Coast Guard in the past week had not indicated any unusual activity.
This earthquake near Torishima island is the first of its magnitude since 2006 when a similar event caused a 16 cm tsunami to reach Miyake-jima. It is also the first time a tsunami advisory has been issued for the Izu islands since the 2022 Tonga-Hunga Ha'apai volcano eruption and tsunami.
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