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Presentation transcript:

Thank you for not chewing gum or anything else  Materials: Pencil Notebook Packet December 11 Agenda: Bell work BP - Earthquakes Earthquake triangulation activity Daily Objective: Today we will learn how to triangulate the epicenter of an Earthquake Daily Question: What is a P wave? What is an S wave?

Earthquake Triangulation - Vocab Triangulation: is process that uses data from three seismograph stations to locate an earthquake's epicenter Time Lag: The time difference between when the P and S wave arrive at a seismograph station. P-waves: Primary Waves – These hit first. They travel at a rate of 6km/second S-waves: Secondary waves – These hit second. They travel at a rate of 4km/sec Epicenter: The point on the Earth’s surface above the focus Focus: The place where the earthquake originates Richter Scale: The scale used to rank the magnitude or size of an earthquake. Calculate the P-S Wave time lag Use the triangulation method to find the epicenter of = earthquakes.

Earthquake Triangulation How do you calculate time lag? How do you calculate the distance to the epicenter in kilometers? How do you calculate how far away on the paper in centimeters the epicenter is? How do you use the angle ruler? INSTRUCTIONS: Finish calculating and triangulating earthquakes 1 & 2 Calculate & triangulate earthquakes 3-5 Answer questions 1-4 Work on extra credit study guide – DUE THURS!