| FAULTLINES | Fractured areas in the earth's crust along which earthquakes are likely to occur: 2 wds. |
| FAULT | Crack or joint between tectonic plates, along which earthquakes are likely to occur |
| RIFTVALLEY | Elongated trough formed by the subsidence of a segment of the Earth's crust along a fault (4,6) |
| IFSO | "Should that occur..." (2 wds.) |
| PIGS | If they're seen in the sky, strange things are likely to occur |
| RICHTERSCALE | By which earthquakes are measured |
| LEAPYEAR | When February 29 occurs: 2 wds. |
| ATDAWN | When much crowing occurs (2 wds.) |
| LITHOSPHERE | Crust and upper mantle of the earth in which earthquakes may originate |
| OR | The room where surgeries occur (2) |
| ASLARGEASLIFE | Legs fail, troubled with areas in the flesh (2,5,2,4) |
| ULCERS | What are inflamed eroded areas in the walls of the stomach and duodenum? (6) |
| HOLDUP | Kind of robbery most likely to occur in rush hour? (4-2) |
| ONTHEHORIZON | As far as I can see it is likely to occur in remote future (2,3,7) |
| SIERRAS | Mountainous areas in the middle of Russia on the radio (7) |
| TURLOUGH | Type of "disappearing" lake found in limestone areas in the west of Ireland. (8) |
| PROBABILITY | Extent to which an event is likely to occur (11) |
| INTHEOFFING | Likely to occur soon: within sight or at hand (2,3,6) |
| PANCAKETUESDAY | When an upward trend in battery production is likely to occur? (7,7) |
| HOLDUPS | Kind of robberies most likely to occur in rush hours? (4-3) |
