*4.3. Event 3—Regime 4*

Regime 4 is poorly represented. It is characterized by only a few reverse faults that are compatible with a NE-SW compression. The stress inversion provided stable results, which has little meaning because of the very low number of faults (5). The tensor solution is very loosely constrained. Had more fault slips been identified, the result would have been subject to significant variations. For a MIFL = 45% one of the five faults is considered unacceptable, and the calculated stress regime indicates a 59◦ compression direction with a nearly vertical σ3 axis and a Φ ratio of 0.44. The direction of compression may however vary within ±20◦.

The reverse faults shown in Figure 5 are younger than those of Regime 1, but there is little indication of their age. Two display the same attitude, but di fferent oblique slip vectors from the reverse faults of Regime 1 from which they are inherited.

**Figure 5.** Regime 4. Lower Hemisphere Equal Area projection of (**a**) grea<sup>t</sup> circles of fault planes and (**b**) of poles to fault planes (open circles) and of calculated trend and plunge (\*) of σ2. Symbols are as in Figure 3.
