So I am wondering if I got the difference right. Both methods use explosives to send waves into the earth's surface. Now reflection seismology tries to get information from the reflected waves; the ones, that do not get into another layer but get reflected from it r get directly through the layer and get reflected by the next. Thereby you would get a much smaller space in which waves would get back to the surface.
In refraction seismology, you want the waves to get into the next layer and as you know that there are different velocities in different layers, that is how you get information out from there (detail here on how that works not of interest right now).
So, you need to use different places for your seismographs in order to get the refracted waves, which are further away from the source than the reflected waves.
I know there is more behind this, but I just want to know if this basically is the difference? Because I am not sure of that...
Then, I would guess, you could always do reflection seismology when you do refraction seismology, just using the reflected waves to determine the structure of the first layer.
Is that somehow correct or Am I missing something?