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Teacher will demonstrate the SeisMac program. Shake the laptop in the three different directions, showing how the different directions are recorded on the three different components. Adjust both the vertical and horizontal scales to show how the same motions can be represented differently. Setting the vertical scales on -1 to +1, tilt the laptop 90 deg in each of the three directions to demonstrate that the seismograms are records of acceleration (accelerograms). When the laptop is oriented normally, the baseline of the vertical component is 1 g and the two horizontal components have baselines of 0 g. However, when the laptop is tilted the vertical component goes to 0 g and one of the horizontal components will go to 1 g. Teacher will present real 3-component seismograms for actual data, and discuss the major seismic phases (P, S, Love, Rayleigh), showing the components they arrive on: P is primarily on vertical, S is primarily on radial and transverse, Love is primarily on the transverse, and the Rayleigh wave is primarily on both vertical and radial components. Students will take turns shaking the seismometer to try to directly replicate the actual seismograms. If two sets of seismograms are used, the teacher can talk about the differences between seismograms at stations that are nearer or further from the seismometer. Has minimal/no quantitative component Addresses student misconceptions
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