Cases of Disaster


Sediment Movement Trace
(Hougawachi Atsumari Area, Minamata City, Kumamoto Prefecture)

Source: Asia Air Survey Co., Ltd.


  1. (1)Collapse at the source head

  2. (2)Falling trace of debris flow

  3. (3)Debris flow sediments distributed all over the valley bottom.

  4. (4)A debris flow ran on a terrace and fell.


  5. (5)Sediment at the confluence of Atsumari River and Hougawachi River

  6. (6)A large boulder transported by a debris flow


  7. (7)Debris flow sediments in tongue

  8. (8)A great deal of driftwood going down with a debris flow

  9. (9)Warning sign of debris flow hazard torrents

  10. (10)A farm vehicle caught in a debris flow

Hougawachi Atsumari Area, Minamata City, Kumamoto Prefecture

(Pictures compared before and after the disaster)

Dameges such as sediment-related disasters

Disaster occurred Prefecture Occurrence number Human damage Number of destroyed houses
Death Injury Complete destruction Half destruction Partial destruction
Debris flow Fukuoka Prefecture 5 1   6 14 22
Kumamoto Prefecture 3 19 7 15 1 5
Kagoshima Prefecture 2          
Slope failure Fukuoka Prefecture 39   1 1 7 13
Saga Prefecture 1          
Nagasaki Prefecture 5     2   1
Kumamoto Prefecture 1         1
Kagoshima Prefecture 1 2   1    
Total 57 22 8 25 22 42