Earthquakes

Seismograph

Chapter 4: EarthquakesBy Sarah J.

Reverse Fault

Strike-Slip Fault

Normal Fault

From past seismographic data, geologists have created maps of where earthquakes occur around the world. The maps show that earthquakes often occur along plate boundaries

Seismic waves cause a simple seismograph's drum to vibrate, which in turn causes the pen to record the drum's vibrations

Geologists use seismic waves to locate an earthquake's epicenter

The amount of earthquake damage or shaking that is felt is rated using the Modified Mercalli scale. The magnitude, or size, of an earthuake is measured on a seismograph using the Richter scale or moment magnitude scale

Seismic waves are vibrations that are similar to sound waves. They travel through earth carrying energy released by an earthquake.

Over "millions of years" the forces of plate movement can change a flat plain into features such as anticlines and synclines, folded mountains, fault-block mountains, and plateaus.

When enough stress builds up in rock, the rock breaks, creating a fault

Tension, compression, and shearing work over "millions of years" to change the shape or volume of rock

Vocabulary Glog

P and S waves

Earthquake - Mt. SinaiWhat happened: the mountain began to smoke because God had appeared as fire, and the whole mountain "quaked greatly" (Exodus 19:18)Time: around 1405 B.CModern day location: Mount Yeroham, southern Israel

Earthquake - CrucifixionWhat happened: when Jesus died, an earthquake occured, rocks broke, the curtain to the Holy of Holies was torn, and the dead were resurrected (Matthew 27:51-54)Time: 33 A.D.Modern Day Location: Jerusalem, Israel