Knowledge Base Question

What does the azimuth header exactly refer to?

Evangelia Tsakiroudi gravatar

Evangelia Tsakiroudi  Dec. 23, 2014, 3:13 a.m.

Does it refer to the azimuth of:

  1. the epicenter to the station, or
  2. of the station to the epicenter?

In other words, what is in the origin of the circle? The epicenter or the station? These two azimuths have a difference of 180 degrees. Which one is used as the azimuth header given in SAC (from SEED) files of Wilber3?

Rob Newman gravatar

Rob Newman  accepted answer  staff  Feb. 26, 2015, 11:48 a.m.

Dear Evangelia,

This is a Seismic Analysis Code (SAC) related question, which is software that IRIS Data Services is not responsible for. Please re-ask this question on the SAC-HELP mailing list.

Warm regards,

- Rob Newman