Petra,

I don't get these very often. Up until about two years ago, I had no idea that eartones were associated with earthquakes. Let's try this;

A. Lasted about 6 to 8 seconds.
B. About a 4 on my scale. If it kept going, anybody would be shaking thier head and thrashing around to get rid of it.
C. Medium high pitch. Smeared E string up the finger board on a blues guitar. Not sure what the Hz would be. Well above middle C though.
D. 33.210N - 116.830W

Appreciated,
Glen