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Photographs of surface cracking that occurred during a series of experiments designed to simulate the intusion of magma along a dike. The dark area at the bottom of image is the dike. Note scale in lower right of photographs (2 cm scale).
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Growth of a few small fissures (locations A and B) on opposite sides of the dike plane at the surface. |
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Growth of additional fissures (location C). Note broad shallow depression starting to form between the parallel set of fissures. |
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Growth of a pressure ridge immediately above the dike (location D) and development of vertical movement along some of the innermost fissures to form inward facing normal fault scarps (locations E and F). Movement along the faults produces gentle monoclines (note slope at location E) and a graben (down dropped block between faults. At the base of top of some well-developed faults Location (F), the surfaces have been tilted back to a horizontal position. |
