Relay ramps are present between closely overlapping faults. Maximum observed displacement scales linearly with fault length for these very small normal faults as well as for the global data set. The new fault data presented here extend the global data set from 7 to 9 orders of magnitude of fault length, and indicate that there is no change in the scaling relation between small and large faults. The faults are only present in certain lithologies, namely relatively massive siltstones. All units indicate NW-SE extension, although the style of fracturing clearly varies with lithology.
Extensional strain appears to be similar in the different lithologies.