Earthquakes and Rivers

In my Science 9 class we did an experiment to see if seismic activity affected river formation. My pod and I used diatomateous soil and magnetic sturrers. The magnetic sturrers were to help replicate an earthquake. To test our hypothesis (seismic activity affects river formation), we put the magnetic sturrers underneath the soft, moist soil and turned the sturrers on. When we turned on the sturrers, not much happenned around them. There were only a few crevices and craters, but no "rivers". We also noticed that all the surface water that was on the soil stayed to the edges of the tub. We did this 2 times and we got the same exact results, and we tested them far longer than a normal earthquake, which only lasts a few seconds. So my pod and I came to the conclusion that earthquakes have very little or no affect on river formation, and for river formation to happen from the earthquake there must be a flow of water in the area of the cracks in the earth (soil).