We live in an area where they say the ground is moving. This place is actually part of the so called West Valley Fault grid that can suffer the most when a strong earthquake occurs. We bought this 20-year old house in 2001 and we are the 3rd owner. When we moved here, we already noticed the fence that separates our property from the vacant lot. The concrete fence is leaning towards the vacant lot. We tore down the fence and erected a new one, also concrete. Now, we are noticing the ground, particularly the concrete like the driveway and the doorway entrance, are showing cracks. I tend to believe that those cracks are the result of minor quakes that are not recorded or not even felt by the sensors because they are short quakes only. But there is damage in the concrete.