| 单词 | footwall |
| 例句 | The terms hanging wall and footwall in the diagrams apply to situations where the fault is not vertical. Physical Geology 2015-01-01T00:00:00Z Normal faults form when the hanging wall moves down relative to the footwall. An Introduction to Geology 2017-01-01T00:00:00Z The direction in which the head of the vein comes into the light, or the direction toward which the tail extends, is indicated by its footwall and hangingwall. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z The total area of ore measured on the footwall was 785 acres. The Economic Aspect of Geology These twin disadvantages usually warrant a straight incline in the footwall. Principles of Mining Valuation, Organization and Administration The body of rock above the fault is called the hanging wall, and the body of rock below it is called the footwall. Physical Geology 2015-01-01T00:00:00Z In a dip-slip system, the footwall is below the fault plane and the hanging wall is above the fault plane. An Introduction to Geology 2017-01-01T00:00:00Z They dig stringers which are rich in metal, or sometimes, for the purpose of searching for the vein, those that are devoid of ore which lie near the hangingwall or footwall of the main vein. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z The ratio of ore area to total explored area, measured in the plane of the footwall, was 21-½ per cent. The Economic Aspect of Geology A step—two, then: "Look—there—over by the footwall!" The Cross-Cut If the fault develops in a situation of compression, then it will be a reverse fault because the compression causes the hanging wall to be pushed up relative to the footwall. Physical Geology 2015-01-01T00:00:00Z In reverse faults, compressional forces cause the hanging wall to move up relative to the footwall. An Introduction to Geology 2017-01-01T00:00:00Z Each sits upon small boards fixed securely from the footwall to the hangingwall, or if the vein is a soft one, sometimes on a wedge-shaped plank fixed on to the vein itself. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z Or, looked at in another way, about 200 feet of drifting in every 1,000 on the footwall will be in ore. The Economic Aspect of Geology At first it appeared only like a succession of disjointed, broken stones, lying in straggly fashion along the footwall of the drift where it widened into the stope, or upward slant on the vein. The Cross-Cut If the fault develops in a situation of extension, then it will be a normal fault, because the extension allows the hanging wall to slide down relative to the footwall in response to gravity. Physical Geology 2015-01-01T00:00:00Z The great weight of these joined timbers is sustained by stout beams placed at intervals, which are deeply set into hitches in the footwall and hangingwall, but are inclined. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z To these timbers are fixed small timbers along the footwall, to which are fastened the lagging and ladders. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z But the hardest rock of the hanging or footwall, however, is seldom as hard as the harder class of ore. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z Nay, further, these same miners, if no stringer or cross-vein intersects the main vein so that they can follow it in their workings, even cross-cut through the solid rock of the hangingwall or footwall. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z To this stake another cord is tied and drawn straight into the tunnel to a point as far as it can go without being bent by the hangingwall or the footwall of the vein. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z Stringers are given the same characteristics as veins, but divided into hanging, footwall, and other varieties. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z |
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