Surface sources

Wireless Trigger Unit 

The wireless trigger unit WTU1 is used to replace trigger cables if e.g. roads or rivers prevent a continuous seismic measurement. The wireless trigger unit WTU1 works with nearly all impulse sources including sledge hammers.
The wireless trigger unit WTU1 consists of two boxes which include the sender and the receiver unit. The sender will be connected to the source and the receiver to the seismograph. The sender and receiver units are placed in small and robust plastic cases which allow an easy operation.



150 x 80 x 50mm

Antenna range:

approx. 18m

Power supply:

9 V


Sledge Hammer | Surface Source

The sledge hammer is used to generate seismic waves (P- or S-waves) at the surface. A piezotrigger element is attached to the hammer. The output piezo signal is transformed to a TTL pulse by a small box to provide an exact time break to the seismograph.

It is a suitable source for shallow downhole surveys up to a depth of 100 m.



Elvis VII | Surface Vibrator Source

The vibrator source ElViS VII is used to generate P- or S-wave sweep signals. The source consists of a moving mass driven by a cascaded linear motor. The source is fully cased. An adjustable pneumatic suspension ensures a maximum release of seismic energy under different surface conditions. The source is most suitable for refection seismic surveys on paved roads and for urban areas. A wheelbarrow allows the movement of the source along the seismic line.



Geosym GmbH

Generated wave types:


Power supply:

12 V DC

Drive system:

Cascaded linear motor

Peak force:

Approx. 1100 N

Frequency range (P and SH):

20 - 240 Hz

Investigation depth (P):

Up to 300 m and more (depending on geology)

Investigation depth (SH):

Up to 200 m and more (depending on geology)

Source weight:

35 kg

Total weight:

130 kg