[CedarDave]

Two powerful earthquakes have struck near the southern Japanese city of Kumamoto, a day after a tremor there killed at least nine people. The quakes - a magnitude 7.1 (4.4 miles) at a depth of 7km and a 7.4 at a depth of 40km (25 miles) - came in quick succession, officials said. Very disturbing. I don't think this is the end of it.

7.1 magnitude - At that shallow a depth could we be looking at magma movements which may reactivate the nearby volcano?

[RayChuang88]

7.1 magnitude - At that shallow a depth could we be looking at magma movements which may reactivate the nearby volcano?

There are two very active volcanoes on the island of Kyushu: Mt. Aso almost in the center of the island and Sakurajima across Kagoshima Bay from the city of Kagoshima in southern Kyushu. These earthquakes could mean either Mt. Aso or Sakurajima could be on the verge of a very active eruption phase, and very large eruptions are common along the Ring of Fire, which the Japanese home islands are part of.