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40Hz Reinforced Geophone for Land, Desert, Snow, Marsh and TZ

40Hz geophone reinforced land case geophone (ST-40N) in vertical direction (P wave) and horizontal direction (S wave) available, which are suitable for deep seismic exploration, advance perdiction, natural seismic survey, pulsating microseismic survey of bridges, dams, highways and railways, safety monitoring, engineering pulse measurement and other vibration analysis.

● Good parameter consistency.

● Firm mechanism structure.

● Good sealability.

● Suitable for multi-wave component seismic data acquisition.

●  GS-20DX, 40Hz equivalent geophone is also available.

● Different type of geophone cases which are suitable for land,desert, snow, marsh and transition zone respectively.

● 3-year limited warranty on basic element exclusive of high voltage, lightening or physical abuse.

We supply 40hz geophone sensor, geophone element, land cased geophone, triaxial geophone and multi-geophone string with KCK connector, KCLconnector, 408 connector, Kooter connector, MP16 connector, Split spring connector or Mueller clip connector. Lead wires from O.D 4.6mm to O.D 7.8mm available.

●Custom geophone connector and leader cable applicable upon request.

Click here and download data sheet of 40hz geophones or contact us to get special discounts.


For any inquiries, please contact with our Marketing Team at or Supporting Team at

Type ST-40N

(Equivalent to SM-4,40hz)

ST-20DX, 40hz

(Equivalent to GS-20DX,40hz)

Natural frequency ( Hz ) 40 ± 5.0% 40±5%
Open circuit damping 0.620 0.37
Damping with Shunt Resistor 0.648 ± 5.0% 0.576±5%
Open Circuit Intrinsic Voltage Sensitivity(V/m/s) 32.5 42.0
Sensitivity with Shunt Resistor(V/m/s) 30.3 ± 5.0% 30.4±5%
Coil Resistance (ohm) 540 ± 5.0% 575±5%
Harmonic Distortion ( % ) <0.2 ≦0.2
Typical Spurious Frequency ( Hz ) ≥300 ≧380
Moving Mass ( g ) 9.3 8.2
Max.coil excursion p-p (mm) 1.8 1.5
Max.tilt angle 20º 20º
Element Diameter (mm) 26.0 27.0
Element Height (mm) 32.0 33.0
Element Weight (g) 80 95.0
Operating Temperature(℃) -40℃ to + 100℃ –45℃ to + 100℃
Warranty Period 3 year 3 year
●  All parameters specified herein are rated at a temperature 20℃±2℃.
●  3-year limited warranty on basic element exclusive of high voltage, lightening or physical abuse.


Other type of geophones are also available: SM-4 Equivalent, SM-6 Equivalent, SM-24 Equivalent, SG10 Equivalent, GS-20DX Equivalent, GS-32CT Equivalent, GS ONE Equivalent, 1Hz, 2Hz, 2.5Hz, 3Hz, 4Hz, 4.5Hz, 8Hz, 10Hz, 14Hz, 15Hz, 28Hz, 30Hz, 38Hz, 40Hz, 60Hz,80Hz and 100Hz.

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