DeNU LOGOpartment of Earth and Planetary Sciences
            Northwestern University

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Expansion of Global Topography on Spherical Harmonics

Topography Expansion

The Pacific view of expansion of the global topography on spherical harmonics. This is done by calculating the l and m coefficients and building the result as the sum of the harmonics series. This figure is created for 12 snapshots (l=0 or "flat" to 0<l<400 or "true" bathymetries). Also,
here is a 3D movie with more information.

Seismicity of the World

The epicenter data for this map are from the USGS catalog for 1900-2013 (M>=5). The blue lines represent plate boundaries.
For the data and a simple script to make this map and movie (using GMT) see below:


   1. Greek Mythology A daughter of Priam, the king of Troy, endowed with the gift of prophecy but fated by Apollo never to be believed.
   2. One that utters unheeded prophecies.