Page 1 of 1

FK results expressed in propagation azimuth or backazimuth?

Posted: Wed Nov 07, 2007 5:14 pm
by admin
> Hi Marc,
> just two very short questions, I can't remember...
> 1) the slowness /wavenumber vector definition in geopsy points
> in direction of propagating wave (correct definition) or points
> towards the source (convenient definition, but opposite direction)?
> 2) backazimuth is measured N over E and math-pi is
> measured E over N, correct?
> thanks for your response
> bye
> Matthias

Posted: Wed Nov 07, 2007 5:38 pm
by admin
This question is always asked and I'm never completely sure... I would say that everything is expressed in propagating azimuth. To ensure it I built a small synthetic database where I'm sure of the direction and the propagation slowness.

Here is a description of the synthetic case:
6 stations, R001 and R002 are in phase, R003 is delayed by 0.866 seconds, R004 and R005 by 0.433 seconds, R006 is slightly in advance. Hence it is a monochromatic wave at 1 Hz traveling in direction 120