In this section, the fault maps of four of the interpreted horizons will be compared. Com-paring the fault maps will show the di↵erence in fault pattern at the di↵erent levels which could indicate the presence of one or multiple detachments in the area.
In the previous section where the fault maps have been described, the following main di↵erences and similarities can be seen. The only fault that can be seen at all levels in mf1 in the Hammerfest Basin. It changes orientation with depth and varies between NW-SE and N-S orientation. Also the location changes slightly with depth. The Ringvassøy-Loppa Fault Comlex is characterized by N-S oriented segmented normal faults, at all levels except for the youngest, the top of the Cretaceous. In this fault map, the faults are NE-SW oriented. Small E-W oriented faults in the Hammerfest Basin are present only in the younger horizons, and can not be seen in the Triassic and Permian maps.
Figure 16 displays the four fault maps positioned on top of each other to compare the location and amount of faults.
The main di↵erences between the four fault maps are in the Hammerfest Basin and in the western part of the Ringvassø-Loppa Fault Complex. To get the best overview of the di↵erences between the horizons, the fault maps are first compared with just the layer above or below it.
Figure 17(a) displays the fault maps of the Top Cretaceous (TC) and the Intra Creta-ceous (IC) superimposed.
Especially in the Hammerfest Basin, the fault pattern between these two stratigraphic levels is very di↵erent. The IC faults in the basin are mostly N-S oriented, whereas the TC faults have a W-E orientation. The main fault in the basin, mf1, is present in both
3.8 Comparison of the fault maps 3 SEISMIC INTERPRETATION
(a)
Figure 16: The fault maps of the four horizons. The figure in the middle shows the di↵erent fault maps together
3.8 Comparison of the fault maps 3 SEISMIC INTERPRETATION
(a) (b)
(c)
Figure 17: Fault maps of: a) the Top Cretaceous (yellow) and the Intra Cretaceous (green), b)the Intra Cretaceous and Base Cretaceous (pink) and c) the Base Cretaceous and Top Permian (purple) horizons together
the fault maps, although its location is more to the northeast in the Top Cretaceous map.
In the Ringvassøy-Loppa Fault Complex, a fault in the south coincides with the southern part of MF1. F3-a is present in both fault maps, as well as F3, although the latter lies more to the west in the TC map. W-E oriented faults in the TC cross the IC faults in the eastern part of the Ringvassøy-Loppa Fault Complex.
In figure 17(b), the fault maps of the Intra Cretaceous and Base Cretaceous (BC) horizons are shown together. Most of the larger faults in the area coincide in the two maps.
The main di↵erences are found in the Hammerfest Basin, where mf1 turns more towards the west in the BC map than in the IC. It also continues further to the south in the BC map. In the BC horizon, in the southern part of the Hammerfest Basin, four faults radiate out of the Troms-Finnmark Fault Complex area in NE and NW directions. These faults are not seen on the IC fault map, where the faults in the basin have a N-S orientation. In the Ringvassøy-Loppa Fault Complex, there are more similarities between the two horizons.
Although the segmentation is shows some di↵erences, the main fault MF1 is present in both maps. The same is true for F2. The southern part of F3 is similar in both maps, but in the BC map it does not splay in the northern part, and a branch of the BC fault goes more to the east. The eastern part of the main fault of the Troms-Finnmark Fault Complex is located more to the south in the BC fault map, and in the western part it crosses the IC fault twice.
An important comparison is that of the Base Cretaceous and the Top Permian (TP) (fig. 17(c)). Di↵erences in fault pattern between these two maps can give information about the possible presence of a detachment between the two levels. A distinct di↵erence is that mf1 in the Hammerfest Basin is not present in the TP fault map. The main fault in the basin in the TP is N-S oriented an not present in the BC map. Also the smaller radiating faults in the south of the basin are not present in the TP. In the Ringvassøy-Loppa Fault Complex MF1 is present in both horizons. However, in the TP map it does not continue as far to the south and it deviates from the BC fault in the northern part, with less segmentation. F2 is not present in the Top Permian. There is a fault in the Top Permian horizons which partly coincides with F3 in the BC map, but as the BC fault continues northwards, the fault in the TP turns towards the northwest.
Going back to the comparison of all horizons together (fig. 16), it is clear that the main deviations are the Top Cretaceous and Top Permian horizons. The general fault pattern