M40 - Mini Geophone
from Geotomagraphie

The Mini-Geophone M40 is used to receive P- and S-waves in horizontal boreholes. The borehole geophone consists of a tri-axial sensor. The geophone is coupled to the borehole wall by a pneumatic clamping system (inflatable bladder). Air is supplied to the M40 through the cable. The orientation of the M40 geophone is controlled from surface by a torsionally stiff hose. The cable is terminated by a connector to the seismograph.

M40- Mini three component Geophone for horizontal boreholes. Image Courtesy of Geotomographie

Product Dimensions

Physical Dimensions (L x W x H) Weight
M40 - Mini Geophone (instrument only) 405 mm x 42 mm x 42 mm 3 kg

Technical Specifications

Geophone sensor: GS14-L9
Sensor frequency: 28 Hz
Sensor arrangement: Tri-axial
Operational depth: Up to 10 m
Cable weight per metre: 480 g
Borehole diameter: 50 mm (or larger if spacers are used)
Clamping system: Inflatable bladder
Orientation: Torsionally stiff hose
Depth indicator: Cable marking every 2 m
Connector: To any seismograph


Contents Dimensions (L x W x H) Weight
M40- Mini Geophone
0.5m x 0.5m x 0.3m 25kg