Variable | Definition | Equations (see Table 2) |
---|---|---|
P (Etw1+) | Probability of at least one eruption of a specified size or greater within a specified time window | 1 |
P (NOtw) | Probability of no eruption of a specified size or greater within a specified time window | 1, 2 |
P (NOh) | Hourly probability of no eruption of a specified size or greater | 2, 3 |
P (Eh) | Hourly probability of an eruption of a specified size or greater | 3, 4, 5, 6, 8 |
P (EhL) | Hourly probability of a large eruption | 4, 5, 8 |
P (EhM) | Hourly probability of a moderate eruption | 5, 8 |
P (EhS) | Hourly probability of a small eruption | 6, 8 |
P (X|E) | Probability of exposure to specified hazard given an eruption | 7 |
P (Fx|X) | Probability of a fatality given exposure to specified hazard | 7 |
P (Fx|E) | Probability of a fatality due to specified hazard given an eruption; subscript b refers specifically to the ballistic hazard | 7, 8, 12 |
P (Fhx) | Hourly probability of a fatality due to specified hazard. Subscript hx.size refers to the hourly probability for a specific eruption size. | 8, 14 |
L | Reference length for ballistic calculation | 9, 10 |
B | Representative ballistic diameter | 9, 10 |
Nb | Number of ballistics in reference area/crossing reference length | |
W | Representative diameter of a person | 9, 10 |
P (bhit) | Probability of being struck by one ballistic | 9, 10 |
P (Sx) | Probability of surviving hazard; subscript nb specifically refers to the designated number of ballistics in reference area/length, and subscript x.size refers to the hazard associated with a specific eruption size | 11, 13, 14 |
P (Fhx.size) | Hourly probability of fatality at a given site from a given eruption size (large, moderate or small) | 14, 15 |