See http://www.thetech.org/exhibits/online/quakes/grams/ for an example seismogram.
Note: this is a placeholder article, someone should upload a free seismogram image.
... Islander, 3.86% from other races, and 3.17% from two or more races. 16.24% of the population are Hispanic or Latino of any race. There are 1,924 households out of which ...