Landstreamer
The landstreamer technique is well suited for near-surface seismic measurements on sealed surfaces, e.g. traffic areas or factory floors. Its development and application was started by LIAG in 2006. Due to its simple design und its flexibility it has proven its value in several surveys. A major advantage of shear wave seismic measurements on sealed surfaces is the suppression of surface waves emitted by the seismic source.
The landstreamer can be equipped either with (a) exchangeable or (b) fixed support points.
A landstreamer consists of four elements:
1. a belt strap (orange), having a width of 100 mm and a breaking strength of 12 000 daN
2. a lower plate having 3 support points of either abrasion-resistant wheel-shaped steel for deployment on concrete, tar and pavement or of abrasion-resistant plastic material for delicate floors
3. an upper plate for mounting different geophone-types (vertical, horizontal or 3-component)
4. a robust cover for cables having a zip fastener (orange canvas)
Landstreamer lower plate with abrasion-resistant plastic support points mounted, for application on delicate floor covers.
Example of application
A landstreamer having 72 horizontal geophones was first operated in 2006 in the ‘Südstadt Hannover’.
Landstreamer in operation: 1. survey by night in ‘Südstadt Hannover’, 2./3. survey in the harbour of Trondheim, 4. survey inside a factory hall.