An earthquake measuring 6.6 on the Richter scale rocked Niigata prefecture of central western Japan and surrounding areas on Monday morning, the Japan Meteorological Agency said. A tsunami warning was issued from the 10:13 a.m. (0113 GMT) quake. The agency warned that waves up to 50 centimeters could arrive at the coastal areas of Niigata on the side of the Sea of Japan. An aftershock measuring 3 on the Japanese seismic intensity scale of 7 was registered in Niigata prefecture at 10:34 (0134 GMT) , the agency said. There were no immediate reports of casualties or damage from the quake, which could also be felt in downtown Tokyo.
The epicenter of the quake was around 10 kilometers below sea level in waters off Niigata prefecture, the agency said. The quake measured upper 6 on the Japanese seismic intensity scale of 7 in Kashiwazaki and Kariwa in Niigata prefecture and Iizuna in Nagano prefecture. The earthquake also affected nearby prefectures including Ishikawa, Yamagata, Tochigi, Saitama, Fukushima and others.
Source: Xinhua
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