Small tsunami waves washed ashore on remote Japanese islands on Tuesday morning after an earthquake that may have been triggered by volcanic activity.
Representative image
Small tsunami waves washed ashore on remote Japanese islands on Tuesday morning after an earthquake that may have been triggered by volcanic activity.
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The offshore quake was not felt, and the tsunami advisory was lifted about three hours later. No damage or injuries were reported.
The Japan Meteorological Agency had advised that waves up to 1 metre (yard) above tide levels could occur on the coasts of the Izu and Ogasawara island chains after the magnitude 5.9 quake occurred off the Izu Islands. The US Geological Survey measured the quake's strength at 5.6 magnitude.
About 21,500 people live on the islands in the Izu group and about 2,500 on the Ogasawara Islands.
JMA said a tsunami of about 50 centimetres (about 20 inches) was detected in the Yaene district on Hachijo Island about 30 minutes after the quake. Smaller waves were detected on three other islands — Kozushima, Miyakejima and Izu Oshima.
The offshore quake occurred about 180 kilometres (111 miles) south of Hachijo island, which is about 300 kilometres (186 miles) south of Tokyo.
Residents on Hachijo said they did not feel the quake and only heard the tsunami advisory, Japan's NHK public television said.
Fumihiko Imamura, a Tohoku University seismologist, said the tsunami is believed to be related to undersea volcanic activity. He urged coastal residents to keep their guard up while the advisory was in place.
Japan sits on the Pacific “Ring of Fire”, a line of seismic faults encircling the Pacific Ocean, and is one of the world's most earthquake and tsunami-prone countries.
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