Prediction

Question 1

How is it easy to predict where an EQ will occur?

Answer 1

As 90% occur at plate tectonics.

Question 2

How to predict ?

Answer 2

Monitor ground water levels.
Release of radon gas.

Unusual animal behaviour.

Local magnetic fields measured.

Risk zones.

Close studies of fault lines.

Hazard don’t maps.

History

Forshocks

Cracks develop

Animals have

Question 3

Close studies of fault lines ?

Answer 3

Help indicate where the next eq will be due.

Study of dan Andreas fault between 1969 and 1988 indicated seismic gap in area of Loma preita ( which hadn’t had any real seismic act it’s for 20 years) this area then has a eq in 1989 6.9 on MMS. And this was really bad. 3,700 injured.

This wasn’t entirely unexpected but wasn’t sure when it’s precise occurrence would be.

Question 4

Why don’t we record all EQs

Answer 4

Some are too small to be detected

Some occur in remote areas not monitored

Question 5

Why can’t we make accurate predictions of when an EQ will occur ?

Answer 5

We don’t have a diagnostic precursor

Question 6

Why is it difficult to predict eq?

Answer 6

They occur beneath the ground so unable to effectively monitor this far down.

Patterns of Eq varies.

Question 7

How are large earthquakes predicted ?

Answer 7

Series of smaller ones

But they aren’t a diagnostic precursor

Question 8

How to mitigate buildings ?

Answer 8

Biggest casualty is falling buildings so need to be Eq proof

Existing buildings retrofitted

Safe zones

Educate public