| Hierarchically Performed Hazard Origin and Propagation Studies Recent countries visiting this post |  |
 | 7 | United States |
 | 1 | |
 | 1 | Belgium |
 | 1 | Germany |
| Hierarchically Performed Hazard Origin and Propagation Studies Recent countries visiting this post | |
| 7 | United States |
| 1 | |
| 1 | Belgium |
| 1 | Germany |