Everything you need to know about seismology can be found in this Manual!:
jAmaSeis is a seismology teaching aid developed by IRIS’s Seismographs in Schools program. It is widely used by science educators worldwide.
For full details on using jamaseis see here: jAmaSeis Installation Guide
Seismogram Analysis by Michael Sammartano:
How to Determine Richter Magnitude by Michael Sammartano:
EarthQuake Epicenter Triangulation by Michael Sammartano:
The anatomy of seismograms: