1. What are earthquakes?

1. Earthquakes are movement of earth’s crust caused by plates shifting and releasing stored energy

• Rocks on either side of a fault snag and build up pressure

• When the rocks break ... shake, rattle and roll!

2. What are seismic waves?

2. Seismic waves are shock waves in the earth caused by an earthquake.

3. What are P waves? 3. P waves are primary waves. They are fast and longitudinal

( push and pull forces)• P waves are the to 'arrive'

at a seismic station. The P wave can move through solid rock and fluids, like water or the liquid layers of the earth. It pushes and pulls the rock it moves through just like sound waves push and pull the air.

4. What are S waves? 4. S waves are secondary

or shear waves. They are

slower. S waves are

transverse- move from

side to side.

S waves move rock

particles up and down,

or side-to-side—

perpendicular to the

Direction of the wave.

5. What are L waves?

5. L waves are “love waves”

• Named after a British scientist who calculated a mathematical model for a wave.

• L Waves are the fastest waves and move from ground to side to side. In other words, they are P or S waves that hit the surface.

6. What is the focus of an earthquake?

6. The focus is

where rocks first

break and move.7. What is the epicenter? 7. The Epicenter is the

point on earth’s surface directly above the focus.

Earthquakes

8. What is a seismograph?

8. A seismograph is an instrument used to record seismic waves.

Earthquake Scales

9. What is the Richter Scale?

9. A Richter Scale measures the total energy released by an earthquake

b) +1 means x32

Earthquake Scales

10. What is the Mercalli Intensity Scale?

10. The Mercalli Intensity Scale is a scale that measures the intensity of an earthquake. The scale quantifies the effects of an earthquake on the Earth's surface, humans, objects of nature, and man-made structures on a scale of I through XII, with I denoting a weak earthquake and XII one that causes almost complete destruction.

Earthquake Zones

11. Where are the 3 major earthquake zones?

11.• Ring of Fire- is located around

the edge of the Pacific Ocean.• Mid-Atlantic Ridge- this zone

is caused by sea floor spreading

• The Mediterranean –Asiatic Belt- occurs because continental plates are colliding.

Earthquake Evidence

12. Describe ground level earthquake evidence

12. Ground level earthquake evidence is side to side or up and down shifts of the ground. The earth has moved mostly slow and steady and is called creep

Earthquake Evidence

13. Describe landscape evidence of earthquakes.

13. There are 5 descriptions:• Slide – rapid down slope

movement of soil, debris, & rock

• Scarp – cliff made by uplifted or subsided earth

Earthquake Evidence

13. 13. • Fissures – long cracks in soil

or rock• Tsunami – an ocean wave

caused by earthquakes

a) can be 30m high at the shore

• Buildings on loose soil have more damage.

Volcanoes

14. What is a volcano?

14. A volcano is any opening in the earth’s crust that release molten rock.

Volcanoes

15. What is a vent?

15. An opening through which material reaches the surface

16. What is a crater? 16. A crater is a

hollowed out area in the top of a volcano

Volcanoes

17. What is the pipe?

17. The pipe is a long crack through which magma moves

18. What is the magma chamber?

18. A chamber with a pocket of magma.

Volcanoes

19. What is an active volcano?

19. An active volcano has erupted during the last century.

20. What is a dormant volcano?

20. A dormant volcano has not erupted for hundreds of years, but it believed that it has the ability to erupt.

http://www.geocodezip.com/v2_activeVolcanos.asp

Volcanoes

21. What is an extinct volcano?

21. A volcano is considered extinct if it has not erupted for thousands of years.

http://hvo.wr.usgs.gov/volcanoes/maunakea/

Volcanoes

22.List the sequence of events when a volcano erupts?

22. Lava flows out –usually gently and quietly

2) Then an explosion of debris occurs. The following are products of a volcano

• pyroclasts – fragments of broken rock from a volcano

• ash – hot fine-grained material

• bombs – large molten or semimolten chunks

Volcanoes

23. What are cinder cone volcanoes?

23. A cinder cone formed from

ash and cinders in explosive

eruptions. Cinder cones

volcanoes are smaller, coned

shaped, and steep slopes.

Example:

• Paricutín, Mexico

Volcanoes

24. What are shield volcanoes?

24. Shield volcanoes are from

from lava flow eruptions. They

have broad with gentle slopes. • An example is

Muana Loa, Hawaii

Volcanoes

25. What are composite volcanoes?

25. Composite volcanoes are formed from

alternating layers of lava and pyroclasts.

Characteristics include:

• They are explosive and have lava eruptions

• They are large with steep slopes

Examples:

Mt. Fuji, Japan & Mt. St.

Helens, Washington

26. Case study: Pompeii 26.

•79 CE•Site was not discovered until 1748•Provided archeologists extraordinary details about daily life in Roman Empire•Some believe that volcano took 2 months to completely bury the town as people were “found” wearing winter clothing in the summer, dates of minted coins and letters•Populist tourist site in S. Italy

27. Case study: Mt. St. Helen 27.•Erupted 05/18/1980. Caused by an earthquake on 03/20/1980.•Most deadliest and costly volcano in US history.•“Glacier mountain”•Due to the eruption, at the top of the mountain is a 1 mile long horseshoe crater.•Volcano “steamed” until January 2008

Igneous Rock Features

28. What are batholiths? 28. Large intrusive igneous rock body that forms when magma being forced upward toward Earth’s crust cools slowly and solidifies underground.

29. What is a dike? 29.Magma that is forced into a crack that cuts across layers and hardens.

30. What is a volcanic neck? 30. Solid igneous core of a volcano left behind after the softer cone has been eroded.

Igneous Rock Features31. What is a caldera?

31. Large, circular-shaped opening formed when the top of a volcano collapses. Crater Lake is an example