Immediately after the earthquake, at 13:06 local time, the Sapporo District Meteorological Observatory broadcastedbroadcast a tsunami warning to residents along the Pacific coast of Hokkaidō. Residents of the Tōhoku region would receive a tsunami warning at 13:13. The tsunami with heights ranging from 2.81 to 5.98 meters struck the coast a few hours later at 15:20,<ref name="NCEI">{{cite web |title=Tsunami Event Information |url=https://www.ngdc.noaa.gov/hazel/view/hazards/tsunami/event-more-info/2060 |website=earthquake.usgs.gov |publisher=NCEI |access-date=29 June 2021}}</ref> causing damage to about 300 buildings. No deaths were reported from the tsunami.<ref>{{cite web |title=On the Earthquake off Nemuro Peninsula, June 17, 1973 |url=https://cais.gsi.go.jp/YOCHIREN/report/kaihou10/01_01.pdf |website=Japan Meteorological Agency |access-date=16 April 2021}}</ref>
Due to the advanced [[tsunami warning systems]] in place and frequent tsunami and earthquake drills in the region, impact from the tsunami was minimal.
