Lecture 12 Flashcards Preview

Geography 103 > Lecture 12 > Flashcards

Flashcards in Lecture 12 Deck (18):
1

Define a compounded hazard.

Linked or sequential events, one event leading to another.

Earthquake ---> tsunami
Earthquake ---> fire

2

Define a risk?

Human or environmental vulnerabilities, exposed infrastructure, activities, economics

3

What are faults?

A break in the earths crust/ fractures in the lithosphere.

4

What happens if a fault suddenly occurs?

An earthquake

5

What is another name for a transform fault?

Strike slip

6

What is an indicator of a slip strike fault or transform fault?

Offset drainage

7

Define a natural hazard?

Atmospheric, hydraulic or geologic process that affects humans society, infrastructure that impacts our lives

8

What is an earthquake?

Surface shaking produced by rapid release of strain from tectonic plates. It produces waves that radiate in all directions

9

What two waves are emitted by an earthquake?

P wave (primary)
S wave (secondary)

10

Describe a primary wave.

Push pull motion that can travel through any surface.
More destructive

11

Describe a secondary wave.

Up down motion. This wave is absorbed by water and sediment but propagates well through solids

12

What is the measure of an earthquake

Intensity and magnitude and is logarithmic

13

What four factors are connected to an earthquakes destruction?

Magnitude and direction
Amplification of waves
What material do structures rest on
Design of structures

14

Define liquefaction.

A surface liquefying due to seismic waves

15

What is a tsunami?

Seismic generated sea wave that starts low and fast offshore And surges up on shore standing up

16

True or false:
earthquakes can alter earths tilt

True

17

What is the epicentre?

The point directly above the focus on the earths surface indication the start of a an earthquake

18

What is a focus?

The origin point of an earthquake located on a fault