Some of them because of the geophones located near roads, rivers or canals and the path also intersects the road, river or canal. The cause of geophones in a group is created equal why geophones stretched symmetrically. Stretched geophones in the group is the last alternative if it is created can not be normal as well as symmetry. Lack of symmetry is caused geophones stretch more sensitive to noise and easier to detect than if the ground roll is created geophones normally. Geophones extending the symmetry can be caused by trace near roads, rivers, canals or other causes that can cause geophones can not created normally. In principle, the stretches geophones extending symmetrically with geophones normally, except that the distance between geophones is reduced, but the distance between geophones of one another should be the same. If the geophones can not be normal then the first alternative is created by the geophones extending symmetrically.
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