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?
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.”
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
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!
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!