The eastern, coastal portion of Sōma was inundated by tsunami flood waters following the magnitude 9.0 2011 Tōhoku earthquake and tsunami off its coastline on March 11, 2011. The tsunami reached up to approximately 4 km inland in Sōma; flooded areas included Sōma Port and the Matsukawa-ura Bay area, up to the elevated Route 6 Sōma Bypass. The tsunami was measured to have been 9.3 meters or higher in Sōma.