i'm guesing this is cos of a certain question about earthquakes and circles and buildings that was on p2 a few years ago. my teacher designed it apparently. and the quesiton wasn't on earthquakes it was on waves, earthquakes was merely an application of wave theories. i do believe that waves have, since this time, been removed from the syllabus. but its best to get ahold of a copy of the syllaus which you should be able to ask your teacher for.