Figure 1: Illustration of P-wave shadow zone, modified from USGS Image at: https://earthquake.usgs.gov/learn/glossary/?term=shadow%20zone (The version above is available at http://people.sfcollege.edu/greg.mead/structure/earthqk.htm).
Originally uploaded in NAGT:Our Resources:In the Trenches:2018 - Volume 8:In the Trenches - July 2018.
Image 188028 is a 530 by 515 pixel WebP
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Jun28 18