HOKKAIDO, Japan (CBS SF) — Northern Japan was shaken by strong earthquake Monday, about 30 minutes after a similarly strong earthquake hit the Indonesia-Philippines region.

The 6.1 magnitude earthquake struck at 9:08 a.m. Pacific Time just west of Hokkaido island, 46 miles south of Rishiri Town and 610 miles north of Tokyo.

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There were no immediate reports of damage or injuries and the Japan Meteorological Agency said the earthquake did not post a tsunami risk.

About 30 minutes earlier, a 6.4 magnitude earthquake struck an island in north-central Indonesia, just south of the Philippines.

While both quakes occured on the so-called Pacific Ring of Fire, the two were not related, according to the USGS.

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COMPLETE QUAKE COVERAGE: CBS Earthquake Resource Center

This article will be updated as information warrants, and follow KPIX 5 on Twitter at @CBSSF or KCBS Radio on Twitter at@KCBSNews for updates on breaking news anytime.

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Carlos E. Castañeda is Senior Editor, News & Social Media for CBS San Francisco and a San Francisco native. You can follow him on Twitter or send him an email.