At least 29 people lost their lives when two powerful earthquakes shook southwestern Japan trapping many others beneath flattened homes .Japan's deadly earthquakes tore open a mountainside in Minamiaso village in Kunamato Prefecture that could cut off food and other relief transport to the worst hit area. The epicentre of the quake was near the city of Kumamoto on the southern island of Kyushu and measured at a shallow depth of 10 kms, the USGS said.USGS said. Thousands of residents sought refuge in gymnasiums and hotel lobbies.Twin quakes triggered fires, power outages, collapsed bridges and gaping holes in the earth. A magnitude-7.0 earthquake struck Japan's Kyushu Island, the same region rattled by a 6.2 quake two days earlier.Japanese Prime Minister Shinzo Abe has expressed concerns about secondary disasters as the weather forecast for southwestern Kyushu is showing rain and strong winds later Saturday.