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Earthquake damage near Modena, northern Italy

Magnitude and Intensity: M. w. 6.0 & 5.8; MMI VI-VII. Date: May 20. th. and 29. th. 2012. Today’s Presentation:. A short lecture activity sequence designed to engage students in learning about EQ epicenter location .

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Earthquake damage near Modena, northern Italy






Presentation on theme: "Earthquake damage near Modena, northern Italy"— Presentation transcript:

Slide1

Earthquake damage near Modena, northern Italy

Magnitude and Intensity: Mw 6.0 & 5.8; MMI VI-VIIDate: May 20th and 29th 2012Slide2

Today’s Presentation:A short lecture activity sequence designed to engage students in learning about EQ epicenter location

Activity works for any class sizeIncorporates three separate activities:Slinky demonstration of EQ wavesThink-Pair-SharePhysical activityGeneration of seismic energy by studentsSlide3

Learning about EarthquakesTwo learning objectives for students undertaking E&PS 101 at UNM-VC are:Students will be able to describe earthquakes;

how they occur,what the three types of seismic waves are, and how these waves differ.Students will be able to determine an earthquake’s epicenter from seismic wave dataSlide4

p wavesp for p

rimary as they arrive first (they are fastest)Compressional wave (“push-pull” motion)s wavess for secondary as they arrive secondShear wave (“side-to-side” motion)Speed = approx. 60-65% of p-wave speedL wavesLove and Rayleigh wavesLarge amplitude, Long duration, Low frequency Speed = Last to arriveSeismic Waves with a Slinky

Body Waves

Surface Waves

Students really appreciate the alliteration hereSlide5

Learning about EarthquakesTwo learning objectives for students undertaking E&PS 101 at UNM-VC are:Students will be able to describe earthquakes;

how they occur,what the three types of seismic waves are, and how these waves differ.Students will be able to determine an earthquake’s epicenter from seismic wave dataSlide6

Locating an Earthquake’s Epicenter

Think-Pair-ShareStudy the graph on the right. Make two observations about the two lines labeled P and S.Slide7

Locating an Earthquake’s Epicenter

It is necessary to measure the amount of time between the arrival of P and S waves on a recordingWe can use the time to read off a distance using our graphSlide8

Think-Pair-ShareFor the Loma Prieta

earthquake, the P-minus-S interval at the Albuquerque seismic station was 2 minutes and 18 seconds (or 2.3 minutes).How far had the seismic waves traveled to reach Albuquerque?Is this enough information for us to determine the epicenter of the Earthquake?Epicenter Distance (km)Travel Time (min)

P

S

Hint:

Each square on vertical axis is 20 seconds, and each square on horizontal axis is 200 kmSlide9

One Station is not enough…With two we can narrow it down…Slide10

Locating an Earthquake Epicenter

We need at least 3, widely spaced places where we can record an earthquake’s energy.123Slide11

Locating an Earthquake Epicenter

Seismograph A

Seismograph B

Seismograph CSlide12

Live Seismic Data

Seismogram A:

Seismogram B:

Seismogram C:

Time (milliseconds)Slide13

Locating an Earthquake Epicenter

Seismograph A

Seismograph B

Seismograph CSlide14

SmartPhone AccelerometersSmart phones measure motionE.g. Turn phone to turn picture feature

That means they can also measure seismic energySearch “Earthquake App” on the internet for more infoSlide15

Let’s see what’s happening around the world…

http://www.geonet.org.nz/earthquake/drums/http://www.ees.nmt.edu/Geop/eworm-heli//http://earthquake.usgs.gov/monitoring/spectrograms/24hr/http://earthquake.usgs.gov/ Slide16

“The Muddiest Point”