Negative and Positive Flower on a Dextral strike slip fault system

Flower structures:
Seismic profiles across main faults of transpressive and transtensive strike-slip duplexes have revealed the following characteristics:
- Fan-like, rather steep faults converge at depth into a single and subvertical fault.
- The deep main fault (the stem) is subvertical.
- Facies and thickness strongly vary for a same stratigraphic layer on both sides of faults.
- Normal and reverse offsets along a single fault plane often result from inversion of the relative movement on the fault.
This upward splay shape of subsidiary faults is termed a flower structure.
- If the vertical component is normal, faults tend to be listric and to form a normal or negative flower structure, which forms a depressed area. This subsiding, commonly synformal area has generally, in map-view, a wedge- or a rhomb-shape. It forms a sagpond, a rhomb graben or, on a larger scale, a pull-apart basin. Negative flower structures are also called tulip structures.
If the vertical component is reverse, the splay faults tend to be convex upward, with gentle dips at the surface. They form a reverse or positive flower structure, which appears as an uplifted, commonly antiformal area (a rhomb horst or push-up). Positive flower structures are also termed palm-tree structures, owing to the convex upward form of the upward-diverging faults.

Negative and Positive Flower on a Dextral strike slip fault system 36db9a3bedde70f40da78e51ce7198ea