EPS C20 Lecture Notes - Lecture 12: Kola Superdeep Borehole, Seismic Wave, Love Wave
5 Oct 2016
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More information about today"s topics in chapters 5 and 6. Cecchi seismograph, e/w comp. , station moncalieri (near torino, Italy) menton earthquake (french cote-d"azur), 23 feb 1887, Major damage in southern france (nice) and northern italy. Cecchi died five days after this recording. Different seismic wave types travel with different velocities. Locate eq: given the s-p time at 3 stations we can locate the earthquakes, modern networks use tens or hundreds of waveforms. Explore the structure of the earth"s interior. Imperfect sphere: equatorial diameter ~12,756km, polar diameter ~12,714km. Chemical composition of lava = window into interior of the earth. We can x-ray (image) the earth with seismic waves. Like all other waves, subject waves are subject to: Discovered in 1910 the boundary between crust and mantle, the. Moho: thin under oceans, much thicker under continents. Observation of shadow zones reveal liquid outer core. Necessary: preliminary model of earth"s interior: in our earth mode, p-waves travel at 5km/s.
