Hi Roger. I used your ring map and it sort of reminds me of theoretical P-wave travel times with just a slight difference.

One question for you. Is the shadow zone for the ring map the same as the P-wave travel map? If memory serves me it’s 103 to 140 degrees.

I enjoyed your site. I’ll reserve any comments until as such time as you update it. Getting started is bad enough without someone telling what to do while your fumbling your way through to get it the way you want it. Take Care…Don in creepy town