Unit 10 Lab Student Response Sheet

STUDENT RESPONSES 1. For Scammon Bay, Alaska, what is the approximate time of the arrival of the first P-wave? a. 14 seconds b. 21 seconds c. 35 seconds d. 30 seconds e. 43 seconds 2. For Emmonak, Alaska, what is the approximate time of the arrival of the first S-wave? a. 38 seconds b. 46 seconds c. 49 seconds d. 52 seconds e. 59 seconds 3. For St. Mary’s, Alaska, what is the difference between the P and S wave arrival times? a. 7 seconds b. 10 seconds c. 12 seconds d. 16 seconds e. 21 seconds 4. What is the approximate distance to the epicenter from Scammon Bay, Alaska? a. 70 km b. 90 km c. 110 km d. 130 km e. 240 km 5. What is the approximate distance to the epicenter from Emmonak, Alaska? a. 70 km b. 115 km c. 130 km d. 160 km e. 240 km 6. What is the approximate distance to the epicenter from St. Mary’s, Alaska? a. 70 km b. 115 km c. 130 km d. 160 km e. 240 km 7. Look at the location that you determined was the earthquake epicenter. Which direction is the epicenter located from Emmonak? a. southeast b. northwest c. northeast d. southwest e. east 8. For these exercises, you may be asked to view a map over time to examine historical imagery. In Google Earth, you will click on the following symbol to do so, then scroll along the bar that pops up to find dates of older imagery. Using Google Earth, go to 5 33 41.62N 95 17 24.58E and zoom to an eye altitude of ~5,000 feet. This is along the coast of Banda Aceh, Indonesia. Now click to view the map over time. Slide the date bar back to 6/2004. Pay close attention to the condition of the structures present at this point. Now slide the date bar to 1/2005 (you can also click on the arrows on the bar). The 2004 tsunami occurred on December 26, 2004, so this image was taken in the following January. Was this area impacted by the tsunami? a. yes b. no 9. Check out the 20 largest earthquakes in the world. What was the magnitude of the 5 th largest earthquake in the world? a. 9.5 b. 9.3 c. 9.0 d. 8.7 e. 8.4

10. In what location was the 5 th largest magnitude earthquake in the world? a. Alaska b. Russia c. Ecuador d. Chile e. India 11. In what location was the largest magnitude earthquake in the United States? a. California b. Nevada c. Oregon d. Alaska e. Maine 12. Go to 44 24 53.83N 110 40 56.52W and zoom to an eye altitude of ~25 miles. This location is within the Yellowstone Caldera. This area is one of the most seismically active in the entire nation. Much of the earthquakes take place in swarms. Based on your research, what is an earthquake swarm? a. earthquakes that move locations rapidly b. earthquakes that occur over long periods of time c. earthquakes that occur close together in time and space d. earthquakes that last for very short durations 13. In the largest swarm to date, from 1985, how many earthquakes occurred? a. ~500 b. ~1000 c. ~2000 d. more than 3000 14. How do the earthquakes in Yellowstone affect the hydrothermal activity (such as geysers) within the park? a. they help maintain the water supply to the geysers so that they aren’t sealed up b. they cause the geysers to stop erupting for a long period c. they cause vast increases in the volume of geyser eruption d. they have no effect on hydrothermal activity