gcp {Rsac}R Documentation

Great-circle-path parameters

Description

Calculates the azimuth and back azimuth of the great-circle-path between two points (source and receiver) on a sphere.

Usage

gcp(s, e)

Arguments

s receiver, or station. This is a list with elements lat and lon given in degrees.
e epicenter, or source. This is a list with elements lat and lon given in degrees.

Value

a list containing the following elements:

C azimuth, in degrees.
B back azimuth, in degrees.
a arc distance, in degrees.
lat latitude defining the path.
lon longitude defining the path.

Author(s)

Eric M. Thompson <eric.thompson@tufts.edu>

References

Lay, T. and T. C. Wallace, (1995) Modern Global Seismology, International geophysics series; v. 58, San Diego: Academic Press.


[Package Rsac version 0.1-7 Index]