A 7.3 magnitude quake struck off Japan\'s east coast Saturday but no destructive widespread tsunami was expected, the Pacific Tsunami Warning Center said. The quake struck at a depth of 10 kilometres (6.2 miles) at 3:10am local time (1710 GMT Friday), 320 km southeast of Ishinomaki in Miyagi Prefecture, according to the US Geological Survey. The USGS intially said its magnitude was 7.5.