More than 80% of people in Japan believe a disaster on the scale of the 2011 Great East Japan Earthquake could occur in the foreseeable future, but nearly 70% say they have not taken sufficient measures to prepare for it, according to a survey released by the Japanese Red Cross Society ahead of the disaster’s 15th anniversary.

The magnitude 9.0 earthquake and tsunami that struck northeastern Japan on March 11, 2011, caused widespread devastation across the Tohoku region, particularly in Iwate, Miyagi and Fukushima prefectures, and claimed approximately 20,000 lives.

The online survey, conducted in January, collected responses from 1,200 people nationwide ages 10 and older on topics such as disaster awareness, preparedness and the preservation of memories of the disaster.