Sources in a seismological context.
Specifically this means:
- Coordinates are specified in latitude, longitude, and burrial beneath the
- 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
For 2D the latitude will ignored and only the longitude will be assumed. This
is the default polar coordinate system with:
x = r * cos(phi)
y = r * sin(phi)
phi is the longitude here.