Update 2018-09-06: Several landslides were triggered by the strong earthquake in southern Hokkaido, including in Atsuma. Several houses were destroyed and roads were damaged. At least one person died in connection to the earthquake and multiple others were injured. Several people are still trapped by debris. A tsunami warning was not issued. A slight sea level change is expected, which it is very unlikely to cause further damage in coastal areas.
There were also several aftershocks. Authorities are warning against further strong aftershocks in the next two to three days. There is still a risk of housing collapses and landslides in the affected areas. Nearly three million power blackouts were reported. Telephone lines are also disrupted in Sapporo. Shinkansen services were temporarily suspended in Hokkaido.
AFP, Asahi Shimbun, The Japan Times
Update 2018-09-05: According to initial reports, the strong earthquake on Hokkaido island in northern Japan, did not cause major damage on Thursday morning (06 September, local time). The epicentre is located around 50 kilometres south-east of the city of Sapporo. There were some power outages.
Travellers are advised to inform themselves via local media and authorities about the current situation on site, to follow instructions from authorities, to exercise caution near mountainsides, as well as to avoid damaged buildings, bridges, and roads. Aftershocks are to be expected in the affected area, which can cause additional damage.
2018-09-05, Japan: Strong magnitude 6.7 M coastal earthquake
Earthquakes of this magnitude cause damage (sometimes severe), to buildings and infrastructure. Transport and infrastructure disruptions are to be expected.
It is unlikely that a destructive tsunami was generated by a coastal earthquake of this magnitude. Smaller, local tsunamis can occur in coastal areas.