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2017 - Gabrielle Simard-Moore - Calculating the...

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August 13, 2017
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2017 - Gabrielle Simard-Moore - Calculating the Epicenter of an Earthquake with Python

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PyBay

August 13, 2017

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Transcript

  1. Calculating the Epicenter of an Earthquake with Python Gabrielle Simard-Moore

  2. From Seismograph to Epicenter • 3 Seismic Stations • P-

    and S-wave arrival time difference • Distance to Earthquake • Draw 3 circles • Intersection = Epicenter

  3. Seismic Data

  4. Getting the Distance and Magnitude

  5. None

  6. Tech Stack • Python • Numpy • Datetime • Math

    • Flask • Ajax/Jquery • Google Maps JS API

  7. Assumptions • Wave velocity in CA crustal rocks P-wave velocity

    ~ 6.34 km/s (varies by +/- 2+) S-wave velocity ~ 3.67 km/s (varies by +/- 1+) • Homogeneity of materials (very unrealistic for a heterogeneous lithosphere)

  8. 3 stations

  9. Many steps

  10. Degrees to Radians

  11. Geodetic (latitude, longitude) to ECEF X, Y, Z coordinates to

    Numpy array ECEF = “Earth centered, Earth fixed”

  12. Vector Normalization

  13. Final Trilateration point: Epicenter

  14. ECEF XYZ to Lat, Lon

  15. Front end

  16. Thanks! github.com/gsimore/earthquakes [email protected]