Have you ever been to crater lake? You drive UP, up a mountain, well above the surrounding terrain. Then you look down into the pretty lake. The lake is lower than the "surrounding terrain" in the sense that it's lower than the rim, but when you're on the rim you are standing on a MOUNTAIN. In any direction from the rim it slopes down, down, down.
Dump an 8' tall pile of gravel in your backyard. Use a shovel to scoop out a hole so that you have a truncated cone 5' high, with a 4' deep hole in the middle. So that the gravel at the bottom of the well is still 1' deep above your lawn.
You now have a 1 to 1000 scale model of Mt. Mazama.
If you wish additional details, see the topographic maps on pages 28, 29, and 30 of Delorme's Oregon Atlas, or any other set of topo maps.
Try doing some googling for "caldera" and "maar". Let us know how many calderas you can visit by driving across a pancake flat plain and then falling into a hole. Maars are closer and sometimes do form a real hole, but, it is still often the case that their floor is near or even above the surrounding elevation.
I give up at this point.
Space/Science » in reply to re: Crater Lake
re: Crater Lake
The whole thread (54 posts)
- A volcanic crater in Meridiani, Mars.
- An Impact Origin for Crater Lake, Oregon
- Columnar jointing in Victoria crater?
- Pillow lava in Victoria crater?
- Ignimbrites at Victoria crater?
- A volcanic dike in Victoria crater?
- Wow, look at the crater in 3-D!
- No, it's not volcanic.
- Just plain silly
- Sorry, Bob