Used Geophones for Sale

• Mark Products 4.5 Hz 3 Component L15B Sensor

• Geo Space HS 10-1 1 Hz Vertical Sensor

• Mark Products L10B/L28B 4.5 Hz Vertical Sensor

• Geophones and Earthquakes

More Information and Cost: 

These sensor are removed from a string of 6 sensors. The sensors are used but in good condition. I currently have one unit online. The event file extensions are *.RWN (N-S component), *.RWE (E-W Component) and *.RWZ (vertical component). Here are two GIF images of earthquakes recorded with this sensor: Ml4.4 Vertical Component and Md2.7 N-S Component.

I'm selling this sensor either "as is" or wired and tested. The "as is" units are removed from the string, you will need to open them and do the re-wiring yourself. The wired units are opened and three wires, with RCA type connectors at each end, are soldered to the geophone elements. I then verify that each element is working properly. The wired units can be directly plugged into my Seismic Amplifier / Filter Board. Please Note: Since I need to open up the wired units they will no longer be waterproof. 

Cost: $85.00 each + shipping for the 'as is" units and $100.00 + shipping for the wired and tested units. This item is in-stock.

The 4.5 Hz sensor elements inside the L15B are also available. If you purchase the vertical element you must mount the sensor with the solder terminals pointing downward. The cost for one vertical sensor element is $40.00 or horizontal for $35.00 + shipping. We have too many horizontal elements in-stock so only horizontal sensors are available.

Please read this if you are planning to use a geophone to record earthquakes. If you would like to place an order please see the  How to Order Web page.

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GeoSpace HS 10-1 1 Hz Vertical Sensor

The coil resistance is 400 ohms.

GeoSpace Web page for the HS 10

This item is not in-stock.

Please read this if you are planning to use a geophone to record earthquakes. If you would like to place an order please see the  How to Order Web page.

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Mark Products L10B 4.5 Hz Vertical Sensor

The coil resistance is about 220 ohms.

This item is not in-stock. 

Please read this if you are planning to use a geophone to record earthquakes. If you would like to place an order please see the  How to Order Web page.

Geophones and Earthquakes:

Geophones, with periods around 1 Hz, are short period devices designed to record local or large regional events. The higher frequency sensors (4.5 Hz and above) are mainly used for oil and geological studies. Geophones with periods around 4.5 Hz  will record local events, see GIF images above, but they are not designed for this purpose. Short period sensors will not record distant (teleseismic) events very well, if at all. Depending on your location they may pick up the P wave of large teleseismic events. If you live in an area where you will only be recording teleseismic events you should not consider using a short period device. To record all of the different waves produced by a teleseismic event you will need a long period device like a Lehman, Shackleford-Gundersen, or broadband sensor. Construction notes on building a vertical broadband sensor can be found here.

More information about geophones can be found here and here.