Don't Panic Geocast

Episode 52 - "You pay for significant digits"

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Last week we talked about glaciers, a basic staple of any geology education. That means it’s only fair to talk about a geophysics staple this week. We can measure gravity at different locations and use it to help figure out what’s under our feet. That and another great Fun Paper this week!

  • It’s All About Pentiums (Weird Al)

    • Gravity Basics

    • All geophysical methods are based on measuring some kind of physical property difference.
    • Gravity is sensitive to the density of the material below the measurement.
    • “Big G"
    • gal (unit)
    • Density for any rock varies widely.
    • Gravity from impact structures

      • Measuring gravity

      • Absolute gravimeter
      • Relative gravimeter
      • Zero-Length Springs
      • Differential GPS

        • Corrections

        • Examples of the more common corrections
        • Eötvös effect
        • John’s explanation of Coriolis Force and Toilets
        • Isostasy
        • Bouguer Anomaly
        • FORTRAN Talwani Example
        • Original Talwani Paper

          • Fun Paper Friday

          • Alarcón, Héctor, et al. “Self-Amplification of Solid Friction in Interleaved Assemblies.” Physical Review Letters 116.1 (2016): 015502.
          • Semis pulling on phone books
          • Mythbusters

            • Contact us:

            Show - www.dontpanicgeocast.com - @dontpanicgeo - [email protected]

            John Leeman - www.johnrleeman.com - @geo_leeman

            Shannon Dulin - @ShannonDulin

            ...more
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            Don't Panic GeocastBy John Leeman and Shannon Dulin
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