Earthquake Today, July 28 -- An earthquake registering a preliminary magnitude of 7.1 shook Kumamoto on Japan's southern main island of Kyushu late Tuesday afternoon and a tsunami advisory was issued, the Japan Meteorological Agency said.

The quake occurred at a depth of 10 kilometers (6 miles) below the sea surface, JMA said.

According to Reuters, Japanese government has issued emergency earthquake warnings for Kumamoto, Nagasaki, Kagoshima, Fukuoka, Saga, Oita, and Miyazaki prefectures, all on Japan's southern Kyushu island.

Japan is one of the world's most earthquake-prone countries, with a tremor occurring at least every five minutes. Located along the "Ring of Fire" of volcanoes and oceanic trenches partly encircling the Pacific B...