Coordinates are specified in latitude, longitude, and burial
beneath the surface.
Moment tensors and vector sources are specified in spherical r, theta, and
phi coordinates. This corresponds to radial, colatitudinal, and
longitudinal directions. This is also know has the Harvard convention for
moment tensors.
All coordinates here are spherical coordinates. If your coordinates are
defined in a geodetic (ellipsoidal) reference system like WGS84, you need
to convert them before passing them to this function.
For 2D the latitude will ignored and only the longitude will be assumed. This
is the default polar coordinate system with:
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