I am looking for a way to detect movement/vibration around a specific area, using some type of sensor(s) that are buried under the ground. I would like this sensor to activate an alarm when there is vibration around it - such as digging, or vehicles driving, etc.
I have heard of sensors for house alarms that are buried in the ground surrounding the house - could that be applicable? I thought about seismographic equipment, but that might used for too big of a scale.
If anyone has information regarding this, or could point me in the right direction, it would be appreciated.
Thanks.