Understanding Seismic Tools Pd 2

Discover the science behind seismographs and how they help us study earthquakes by tracking seismic waves and pinpointing epicenters.

How Seismographs Work Follow this link (click on the title) to read about how seismographs work. How Do Seismographs Work? How Are Earthquakes Studied? Follow this link (click the title) to read more about how seismographs work. Then, answer the questions below. How Do Seismographs Work? 1. What are seismographs? a musical instrument an instrument that detects earthquakes a recording of an earthquake (wavy lines) an instrument that predicts earthquakes 2. How does a seismograph work? when an earthquake happens, the quake is recorded by the movement of water inside the instrument once an earthquake happens, a computer estimates the size and draws the waves a pen or magnet inside stays still, and the case of the instrument moves in the earthquake; the relative movements are recorded after an earthquake, people draw what they felt and upload the images 3. Where will the waves of an earthquake be strongest? nearest to the epicenter farther from the epicenter depends on the type of earthquake How Do I Read a Seismogram? Follow this link (click on the title) to learn how to read a seismogram. Then, answer the questions below. How Do I Read a Seismogram? 4. What have you learned about the seismic waves? Match the waves with their descriptions. p-waves first to arrive s-waves second to arrive; may not show up in some locations surface waves last to arrive; are sometimes the only waves to arrive a far distance away Follow this link (click the title) to read about how seismographs work. Then, answer the questions that follow. How Seismographs Work A Seismograph In Action Watch this quick video which shows a seismograph in action. Then, use your prior knowledge to answer the question below. 5. Which of the following explains why the mass don't move with the rest of the instrument? friction convection inertia high air pressure Reading a Seismogram You are going to practice reading a seismogram and determining the distance to the epicenter of an earthquake. Use the seismograms below to help you answer the questions. Balbo Heights, Panama Seismic Station What time did the p-waves hit the seismic station in Balboa Heights? 16 mins 17 mins 18 mins 19 mins What time did the s-waves hit the seismic station in Balboa Heights? 21 mins 10 secs 23 mins 50 secs 24 mins 20 secs 25 mins What is the difference in arrival times between the p and s waves at Balboa Heights? 2 mins 20 sec 3 mins 10 secs 4 mins 50 seconds 5 mins How far away is Balboa Heights from the epicenter of this earthquake? ( use your time-travel graph on page 113 of your orange packet) 3000km 3200km 3500km 3800km Boulder, Colorado Seismic Station What time did the p-waves hit the seismic station in Boulder, Colorado? 16 mins 16 mins 20 secs 17 mins 10 secs 18 mins What time did the s-waves hit the seismic station in Boulder, Colorado? 15 mins 20 secs 16 mins 30 secs 17 mins 10 secs 18 mins 40 secs What is the difference in arrival times between the p and s waves at Boulder, Colorado? 1 min 30 secs 2 min 40 secs 3 mins 20 secs 3 mins 50 secs How far away is Boulder, Colorado from the epicenter of this earthquake? ( use your time-travel graph on page 113 of your orange packet) 1200 km 1400 km 1500km 1800km