Presentation is loading. Please wait.

Presentation is loading. Please wait.

Energy Transformation in the form of Seismic Waves

Similar presentations

Presentation on theme: "Energy Transformation in the form of Seismic Waves"— Presentation transcript:

1 Energy Transformation in the form of Seismic Waves
Earthquakes and waves Energy Transformation in the form of Seismic Waves

2 Earthquakes Earthquakes transfer stored energy into kinetic energy in form of seismic waves. Waves are an oscillation or vibration that transfers energy

3 Earthquake Identification and Location
Earthquakes are located and identified by their focus, epicenter and magnitude Focus: The point where the fracture in rock occurs, (under ground). Epicenter: The point, on land, directly above the focus point. Magnitude: The amount of energy or destruction that has been released/caused

4 Magnitude Magnitude is measured with 2 different types of rating scales. 1. Richter Scale: Measures the total amount of energy released by the earthquake. Magnitude 7 or greater is a major quake Magnitude 6 or less is a minor quake Magnitude 2 or less is a micro quake or tremor

5 Magnitude Continued 2. Mercalli Scale:
Measures the degree of destruction that has been caused. This is a scale that is far more subjective in nature. Mercalli scale rates on a scale of I – XII I is little damage and XII is extreme destruction

6 Seismic Waves Primary or P waves Secondary or S waves
Fastest moving seismic wave Arrive at recording stations first Moves in a spring like way Travel through both liquid and solid material Slower moving wave Arrives at recording stations after the P wave Moves in an up and down way Cause buildings to shake Travels through solid material only

7 Primary and Secondary Waves
P waves oscillate through compression and expansion, in the same direction of movement S waves oscillate in a direction that is perpendicular to direction of movement

8 L-Waves L waves are also known as surface waves
They are the slowest but most destructive waves They are the waves that cause surface rolling

9 Seismic wave movement through earth’s layers

10 Distance to Epicenter Seismologists determine the distance to the earthquake’s epicenter through analyzing the difference in arrival times at the recording station. When arrival times are close, with little difference, the distance to the epicenter is very small. The greater the difference in arrival times, the further away the epicenter is Use information from 3 recording stations to triangulate the location

11 Triangulation


13 Location of Earthquakes
3 major locations where earthquakes occur Ring of Fire Seismic activity is due to the subduction of ocean and continental crust

14 Earthquake location continued
2. Mid ocean ridge Seismic activity due to the divergent plate boundary

15 Earthquake locations continued
3. The Eurasian-Melanesian Mountain Belt

Download ppt "Energy Transformation in the form of Seismic Waves"

Similar presentations

Ads by Google