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Table 5 Equivalent risk of fatality given an hourly risk, assuming no other risks

From: Evaluating life-safety risk for fieldwork on active volcanoes: the volcano life risk estimator (VoLREst), a volcano observatory’s decision-support tool

Hourly risk of fatality

Risk of fatality

One year

(8760 h)

Work year

(1920 h)

Work month

(160 h)

Work week

(40 h)

Work day

(8 h)

10−3

0.9998

0.85

0.15

0.039

8.0 × 10− 3

10−4

0.58

0.17

0.016

4.0 × 10− 3

8.0 × 10− 4

10−5

0.084

0.019

1.6 × 10− 3

4.0 × 10− 4

8.0 × 10− 5

10−6

8.7 × 10− 3

1.9 × 10− 3

1.6 × 10− 4

4.0 × 10− 5

8.0 × 10− 6

10−7

8.8 × 10− 4

1.9 × 10− 4

1.6 × 10− 5

4.0 × 10− 6

8.0 × 10− 7

10−8

8.8 × 10− 5

1.9 × 10− 5

1.6 × 10− 6

4.0 × 10− 7

8.0 × 10− 8

  1. All values are rounded to two significant figures except for the first entry. A year is assumed to have 365 days, a work year is assumed to be 48 weeks, a work month is assumed to be 4 weeks, and a work day is assumed to be 8 h. The work week is assumed to be 40 h