A big aftershock rattled south-west China on Sunday killing at least one person and injuring 400 others, state media reported, nearly a fortnight after a big quake killed tens of thousands in the same area. More than 70Â 000 houses toppled during Sunday’s tremor in Sichuan province, state television reported. The 5,8 magnitude aftershock was epicentred 40km west-northwest of Guangyuan.