![]() ![]() His parting words? “Good luck to you.”ġUPDATE 12:15 PM EST 08/13/15: This story was updated to reflect the correct formula for the moment magnitude. At this point, I mentioned to Heaton that I was in fact speaking to him from an office building in downtown San Francisco. And since 1906, San Francisco has built a lot more tall buildings downtown. Another is that tall buildings are more vulnerable to long, slow lurches of the ground that only occur in huge quakes. New and ugly things happen when earthquakes get past 8.0 or 8.5. “This confusion over earthquake magnitude seems to be creating a lot of confusion in the design of buildings,” says Heaton. Have you tried to explain it to people?’” “Seismologists were saying people understand magnitude. It’s more logical than Richter but also more layperson-friendly than seismic moment. A 5.0 earthquake might be equivalent to 400 Akis-so that a tiny 2.0 could be measured in milli-Akis and a devastating 9.0 in billions of Akis. “It feels almost sacrilegious, but I have to say it.” Instead, she proposed a scale based on seismic moment using Akis, named after the inventor of the seismic moment, Keiiti Aki. “I hate the Richter scale,” she began the piece. Seismologists use seismic moment-which, remember, is basically energy released-to compare earthquakes because it does get at the totality of an earthquake rather than the shaking at just one particular place in the ground.īack in 2000, Jones wrote an article in the Seismological Review Letters suggesting a new earthquake scale. In other words, the relationship between shaking amplitude and earthquake energy from Richter doesn’t hold for all earthquakes, and moment magnitude doesn't easily translate to earthquake intensity. Shallow earthquakes, less than 20 km deep, are associated with _.Seismologists now understand that many variables, like the type of soil, affect the intensity of surface shaking from earthquakes.Which of the following measures an earthquake's intensity based on the observed effects on people and structures?.The moment magnitude of an earthquake depends on all of the following except _.Who developed the procedure used to measure the size of an earthquake?.How do rock particles move during the passage of a S wave through the rock?.Perpendicular to the direction of wave travel The difference in arrival times between which pair of waves can be used to determine the distance to the epicenter?.Which set of waves are probably the surface waves?.What causes the up-and-down wiggles on the seismogram show above?.What type of faulting is illustrated in this diagram?.Point A, where slip initiated during the earthquake, is called the _.Where is the focus with respect to the epicenter:.In general, the most destructive earthquake waves are the _.Richter magnitude does not measure intensity ![]() The amount of ground motion is one measure of earthquake intensity. Earthquake A has a Richter magnitude of 7 as compared with earthquake B's 6.With increasing travel time the difference in arrival times between the P and the S waves _.Which boundary marks a change from 100% solid to 100% liquid?.If an S wave were to go from a solid to a liquid - what would happen to its velocity?.If a P wave were to go from a solid to a liquid - what would happen to its.If only density increases with increasing depth within the Earth, the velocity of a P wave should _.The resistance to change in volume of a solid The resistance to change in volume of a liquid How often do magnitude 8 earthquakes occur?.Which type of faulting would be least likely to occur along the mid-Atlantic ridge? moment magnitude scale: 1 n a logarithmic scale of 1 to 10 (a successor to the Richter scale) that enables seismologists to compare the energy released by different earthquakes on the basis of the area of the geological fault that ruptured in the quake Type of: graduated table, ordered series, scale, scale of measurement an ordered.Approximately what percentage of earthquakes occur at plate boundaries?.Earthquakes can occur with _ faulting.How many seismograph stations are needed to locate the epicenter of an earthquake?.Detailed studies of what earthquake allowed researchers to develop the elastic rebound theory?.How do rock particles move during the passage of a P wave through the rock?īack and forth parallel to the direction of wave travelīack and forth perpendicular to the direction of wave travel.Which of the following sequences correctly lists the different arrivals from first to last?.The point where movement occurred which triggered the earthquake is the _.The amount of ground displacement in a earthquake is called the _.Which of the following describes the build up and release of stress during an earthquake?.Weathering Multiple Choice Questions for Earthquakes - Chapter 16Įach chapter will include a few questions designed to test your knowledge of material covered in the chapter and in the Internet-based resources. ![]()
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