| Tier | Texts |
|---|---|
| S | ARCTIC, AMAZON RAINFOREST |
| A | HAITI EQ, LAOS, MERAPI, DRC, MANGAWHAI PAKIRI |
| B | E 15, US, BRAZIL, STARTFORD, SANDBANKS, AFGHAN |
| C | MT ONTAKE, TURKEY/SYRIA EQ, NEPAL EQ, NORTHWOOD, SALBRUN/FANBORUUGH, TOHUKU JAPAN EQ, INDIA, WOKING |
| D | TOXTETH, MONSTERRAT, NILE DELTA |
