Geohazards Lecture 1

Question 1

How to tectonic geohazards differ from other geohazards?

Answer 1

• infrequent
• high energy
• internally driven

Question 2

What is a ‘natural hazard’

Answer 2

Describes the potential for dangerous natural phenomena related to a natural (catastrophic) event

Question 3

What is RISK associated with a natural hazard?

Answer 3

A description and measure of the potential harmful consequences to the natural phenomena to: livelihoods, environment, life, economy, health, property

Question 4

Formula for risk

Answer 4

RISK = hazard potential * loss potential

Question 5

What is a probabilistic hazard?

Answer 5

Probability that an event of a given size will occur in given area within a specified time interval and incurs specific effects

Question 6

What is a deterministic hazard?

Answer 6

Determining the consequences of a given scenario e.g. a mag 7 EQ occurring along this fault how large an area will be affected?

Question 7

What formula relates probabilistic and deterministic hazard?

Answer 7

Rprob = ΣP(i)Rdet(i)

Rprob = probabilistic hazard estimate

Question 8

Is a 2 year seismic hazard map of a region:
Long term, intermediate, short term, real time?
Probabilistic, deterministic

Answer 8

Long term

Probabilistic

Question 9

What time scale hazard assessment type and what time of answer is :

Map of projected tsunami arrival times after EQ along tonga subduction zone?

Answer 9

Real time

Deterministic

Question 10

what are the hazard assessment timescales?

Answer 10

long-term=years-decades
intermediate-term=months-years
short-term=hours-weeks
real-time=minutes-hours