Dear All,

For MASW acquisition, I am using 48 channel streamer with near offset 8 meter so the mid point will be 31.5m (23.5+8) behind the shot location.

I have some questions :

1.  I used to keep 24th Geophone(mid point) at starting of the proposed line and finish the line with 24th geophone at the end point of line. WHY? How the one shot gather corresponds to a single mid point?

2. Is this method follow reflection phenomena or refraction? If reflection, we need no. of gathers to convert in CMP.

3. What is happening behind the conversion of shot gather in to dispersion curve?

4. What Inversion algorithm it follow and how it convert it to S wave veloctiy section?