Many thanks, Thomas, for your interesting extension thoughts for Quake Shake. This sounds a really good idea and one which students would certainly enjoy, especially the 'quake-off' at the end! If you try this out, please let us know the results.
Just click here to see the comments on Quake Shake. All comments and suggestions like this are gratefully received and will be added to the website, after the original activity. By the end of the International Year of Planet Earth, we shall have 57 activities and, hopefully, lots of extension and modification ideas.