Seismology plays an important role in subsurface imaging. The challenge in surface monitoring, however is the requirement for excellent DAS interrogation system and coupling in between optical fiber as its sensor with the surface of intended imaging. With an excellent system, it solves the underlying industrial challenge of subsurface imaging via surface deployments of DAS. This is particularly useful for sensitive sites where damaging ground is forbidden for preservation purposes (eg. archaeological, construction, nature reserve sites). 

Specific to the field test completed involving completely uncoupled optical fibers, xDAS is capable of recording seismic energy several tens of meters away from the source. Excellent xDAS subsurface imaging is possible with the appropriate coupling strategy, while in this case, with limited mechanical coupling resources, with simple weights, pressed against the sensor and surface of intended imaging, results in subsurface imaging multiple distances relative to uncoupled optical fiber has been proven. With this, xDAS caters to a wide range of application including vertical seismic profiling (Oil and Gas), earthquake and tide monitoring.  

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