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River Noise

In this picture, between the times of 03:04:55 and 03:05:05 an earthquake occured.  Everything looks to be in order, until I get to the sensor GRIVR.  It seems to be much more noisy then the other sensors and it is pretty hard to tell the earthquake from the noise.

The reason for this is that we put the sensor right next to a river.  The river made vibrations in the ground which were picked up by our sensor.
If you look closely between the time 03:04:55 and 03:05:00 you can see a slight increase of vibration on GRIVR but not by much.  Since there is so much noise by this spot, this probably would not be a good place to put a sensor.