Geography- Earthquakes Flashcards Preview

Grade 9 November Exams > Geography- Earthquakes > Flashcards

Flashcards in Geography- Earthquakes Deck (12):
1

Earthquake

The release of sudden and extreme energy that is caused shifting in the earth's crust.

2

Types of plate boundaries

Converging and transforming

3

Most earthquakes occur

On plate boundaries

4

Earthquakes occur

Where two plates grind past one another
Subduction zones
Associates with the formation of new crustal material at mid-oceanic ridges and rift valleys.

5

Epicenter

Exactly perpendicular to the focus.

6

Primary waves

Fastest

7

Secondary waves

Strongest
Higher amplitude

8

Rayleigh waves

Roll the ground

9

Seismograph

An instrument that records earthquakes

10

Richter scale

Numbers
Measures energy waves emitted by earthquakes.
Each level is 10x stronger than the previous level.

11

Mercalli scale

Records the effect and damage caused by an earthquake

12

Seismogram

Trace, drawn by the seismograph

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