Task, I think what you might have there is a prerelease version of the Delta Khara Descent track. A version made it up on the Pure site before it was announced. If I remember correctly it was that very track and quakes didn't work but I'm pretty sure that quakes work fine on the fixed version that was up when it was officially announced.

Which version are you playing? I know the quakes work in my EU version as I was playing that just yesterday but I could check either of the other versions for you if you like.