At the river crossing we use the transverse cable whose length can reach 200-300 meters. Usually on the river there were traces of the dead because the trace is located in the middle of the river and not allowed to be compensated or offset. River crossing, when the crossing is intersected by a river wide enough so that we can not connect to the cable link. Should be arranged in such a way that the distance between geophones at large. Stretch parameter group is geophones planted in a circle with a diameter of a circle of 1 meter. The monitor records can be seen that the stretch of that in the group will produce a larger vibration amplitude and relatively longer in detecting vibration. But the expanse was also more sensitive in the group receiving seismic vibrations. The stretch group is the most sensitive to noise from outside and the ground roll because the range between geophones is near. 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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