Two moderate earthquakes struck off Japan's northeastern coast today, the U.S. Geological Survey said — a magnitude 5.5 tremor about 39 miles east of Onagawa Chō and a magnitude 5.0 quake roughly 38 miles east of Tomioka.

No immediate reports of damage or tsunami warnings were issued in connection with either event.

Japan Earthquakes: Where were the epicenters of the earthquakes today?

The epicenters were about 82 miles apart, with the Onagawa quake occurring around 235 miles northeast of Tokyo and the Tomioka quake about 154 miles from the capital.

Japan sits along the seismically active "Ring of Fire" and experiences hundreds of earthquakes each year, though most cause little or no damage thanks to strict building codes and extensive disaster preparedness measures. The country has

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