videosraka.blogg.se - The seismac waves of an earthwuake

Why do you think this was the case? (Listen to student answers.) So which earthquake resulted in the most damage to human-made structures and thus, loss of lives? (Listen to student guesses.) Well, reports say about 500 deaths in Chile, and more than 300,000 fatalities in Haiti! That means that the earthquake with the lower intensity caused the most damage. This means the earthquake in Chile was about 500 times stronger than the earthquake in Haiti. The earthquakes in Haiti and Chile happened within a month of each other do you know which one resulted in the most damage and led to the greatest loss of human life? (Students may not know, so give them more information.) Well, the earthquake in Chile rated an 8.8 on the Richter scale, and the earthquake in Haiti was rated 7.0. Why do you think engineers might be concerned about earthquakes? (Give students a minute to think and write down answers before asking them to share their thoughts.)Ĭan you think of any big earthquakes that you have heard of in your lifetime? (Possible examples: Japan in March 2011, Chile in February 2010, Haiti in January 2010, China in May 2008 see the US Geological Survey's list of the world's largest earthquakes.) (optional: Show students videos of the destruction caused during large-magnitude earthquakes, which can be easily found by searching on YouTube.) (In advance, prepare a computer projector to show students the attached 16-slide PowerPoint presentation and short videos at the end of this introduction, and make copies of the accompanying note-taking worksheet.) Generally know about the Richter magnitude scale, which indicates the intensity of earthquakes on a 1 to 10 (base-10 logarithmic) scale.

Explain the role of shake tables for engineers who design structures to withstand the motions caused by seismic waves.

Explain the different types of seismic waves and how they move through the Earth.

Describe the relationship between the wavelength and frequency of a wave.

Describe waves using appropriate vocabulary: amplitude, crest, trough, wavelength, frequency.

A properly engineered structure does not necessarily have to be extremely strong or expensive it has to be properly designed to withstand the seismic forces while sustaining an acceptable level of damage.Īfter this lesson, students should be able to: This involves applying an understanding of seismic waves in order to create and maintain structures and urban infrastructure to perform to expectations when under duress from seismic loading due to seismic waves. This engineering curriculum aligns to Next Generation Science Standards ( NGSS).Įarthquake engineering focuses on protecting people and the natural and human-made environments from earthquakes by limiting seismic risk. Students learn how engineers build shake tables that simulate the ground motions of the Earth caused by seismic waves in order to test the seismic performance of buildings.

The dangers of earthquakes are presented as well as the necessity for engineers to design structures for earthquake-prone areas that are able to withstand the forces of seismic waves.

Students learn about the types of seismic waves produced by earthquakes and how they move through the Earth.