Earthquakes (day 6)

Finding the Epicenter: Triangulation Part 1

Do Now

How much longer did it take the S-waves to arrive at this station, as compared to the P-waves?

What is the distance from the epicenter?

Aim, Learning Target & Agenda AIM:

How do we find the distance between the earthquake epicenter and the earthquake

Learning Target: I CAN use observational data to solve for the

earthquake epicenter Agenda

Do Now Lesson – Modeling & Check Practice

Thinking question… If the epicenter of an earthquake was 230 km

away from Albany, where did it happen?

The earthquake could have happened anywhere along the circle

Triangulation If we have seismic data from three different

seismic stations, we can locate the epicenter of an earthquake.

Weird…

“Earthquake-prone Japan has a market for these suits that you strap onto your cats and dogs so that they can survive for days after a major earthquake. Each suit contains all of the necessary gear including water, biscuits, aromatherapy oils, and rubber foot pads, all contained in the pockets of a flame-resistant coat.”

Real Life Connection GPS uses triangulation to determine your

location.

How to Triangulate We know the first two steps.

1.DETERMINE THE DIFFERENCE IN TRAVEL TIME2.USE YOUR ESRT TO DETERMINE THE

DISTANCE TRAVELED

Lets Practice Those Two Steps: **Be careful! Each tick mark is not a minute!

How much is each tick mark here? 20 seconds Seattle: 1 minute and 50 seconds Distance: 1100 km

To Continue With Our Steps Here is Our Data:

Step 3 We need to draw a circle around the stations:

Using the map scale we set our compass to the exact distance.

Put our compass starting point on the station Draw a circle around in the station with the exact

distance Lets Practice!

Line up the first circle hole with the length that you need!!!!Line up the first circle hole with the length that you need!!!!

Where the ruler starts on your compassis where you should line it up!Where the ruler starts on your compassis where you should line it up!

Step 4 Repeat for the other two stations.

Step 5 Your EPICENTER is the point where all three

circles comes together – Place a Star here

Practice Oh no! There was another earthquakes in the

US. Use the data from last nights HW to determine the location of each epicenter.

FIRST GROUP TO GET IT RIGHT GETS A PRIZE! The coolest part about this stuff is you KNOW

if you’ve done it correctly because the circles meet.

This is where precision and accuracy are very important!!!!! If you estimate, your circles wont meet!

HOMEWORK For Tonight’s HW:

Complete the page in your packet titled: EPIC Epicenter HINT: You may need to look back in your Text Reading

to help you complete this assignment – Page 181 WILL HELP YOU!