I am after some cheap geophones. They do not need to be highly accurate, and can be horizontal or vertical. Looking for 10 Hz geophones in particular. Thanks
There was one team From Saudi Arabia, who wanted to give a try to design geophone on their own. Off-course calibration and some validation will be required but you can give a thought on this idea!
Any way, I wish you MERRY CHRISTMAS AND HAPPY NEW YEAR 2015!