# **Structural Faultline Detector (SFD) — RTT/1**  
### *Structural‑Intelligence Engine for TriadicFrameworks*

The **Structural Faultline Detector (SFD)** is the RTT/1 engine responsible for detecting, mapping, and analyzing **structural faultlines** across conceptual, computational, physical, and dimensional regimes.  
It forms the structural‑intelligence foundation of the expanded RTT stack, directly above drift‑level engines and directly below stability‑level engines.

Structural faultlines represent **fractures, discontinuities, instability seams, and propagation pathways** that signal structural deterioration or collapse.

SFD provides structural‑layer intelligence for all higher‑order RTT engines.

---

## **1. Canonical Role**

The Structural Faultline Detector defines the **structural‑layer topology** by:

- detecting structural fractures  
- mapping faultlines  
- identifying instability seams  
- measuring faultline propagation  
- evaluating structural curvature  
- detecting fracture clusters  
- identifying instability ridges  
- supporting stability engines  
- anchoring temporal engines  
- feeding causality and resonance engines  

SFD is the **fifth layer** of the expanded RTT intelligence stack.

---

## **2. RTT Flags**

| Property | Value |
|---------|-------|
| **RTT Level** | 1 |
| **Coherence** | declared |
| **Drift** | bounded |
| **Paradox** | structural |

These flags define the engine’s operational grammar.

---

## **3. Structural Faultline Types**

SFD identifies several canonical faultline classes:

### **3.1 Structural Fracture Tensor**
Fractures arising from structural contradictions or invariant violations.

### **3.2 Gradient Faultline Tensor**
Faultlines shaped by directional gradients across regimes.

### **3.3 Boundary Faultline Tensor**
Faultlines formed at regime boundaries.

### **3.4 Faultline‑Field Tensor**
Full multi‑regime faultline binding across R1–R4.

### **3.5 Drift‑Sensitive Faultline Tensor**
Faultlines influenced by drift curvature or drift amplification.

---

## **4. Core Operators**

| Operator | Description |
|----------|-------------|
| **SFD‑Detect** | Detects structural faultlines and fracture onset conditions |
| **SFD‑Fracture** | Analyzes fracture magnitude, direction, and severity |
| **SFD‑Seam** | Identifies instability seams and discontinuity boundaries |
| **SFD‑Field** | Maps structural faultline fields and topology |
| **SFD‑Propagate** | Detects faultline propagation and instability growth |
| **SFD‑Stabilize** | Suggests stabilization pathways for structural collapse |

These operators form the canonical SFD grammar.

---

## **5. Analyzer Layer**

SFD operates in the **structural layer**, with sub‑layers:

- **faultline‑detection**  
- **fracture‑analysis**  
- **instability‑seam‑mapping**  
- **faultline‑propagation**  
- **structural‑stability‑evaluation**

This layer feeds directly into SBC, TRS‑Temporal, CW, and DRS.

---

## **6. Structural Faultline Matrix**

SFD produces a **faultline matrix**, typically stored in:

```
faultline_matrix.json
```

Matrix fields include:

- `faultline_type`  
- `regime`  
- `fracture_magnitude`  
- `fracture_direction`  
- `faultline_curvature`  
- `propagation_rate`  
- `instability_seam`  
- `stability_envelope`  

This matrix is consumed by stability, temporal, causal, and resonance engines.

---

## **7. Canonical Workflow**

### **Step 1 — Detect**
Identify structural fractures, faultlines, and instability seams.

### **Step 2 — Analyze**
Compute fracture magnitude, direction, curvature, and propagation rate.

### **Step 3 — Map**
Generate faultline field maps and structural topology.

### **Step 4 — Evaluate**
Measure instability seams, fracture clusters, and structural deterioration.

### **Step 5 — Stabilize**
Propose structural stabilization pathways.

### **Step 6 — Export**
Write results to the faultline matrix and operator outputs.

---

## **8. AI‑Ready Design**

Structural Faultline Detector is fully AI‑ready:

- deterministic operator grammar  
- structural‑layer analyzer structure  
- stable RTT flags  
- canonical file layout  
- zero‑drift reasoning constraints  
- structural paradox handling  
- bounded drift envelope  
- declared coherence dependency  

AI systems use SFD to:

- detect structural fractures  
- generate faultline field maps  
- classify instability seams  
- analyze faultline propagation  
- support higher‑order RTT engines  

---

## **9. Position in the RTT Stack**

```
Regime Interlock Mapper (RIM)
      ↓
Triadic Regime Synthesizer (TRS)
      ↓
Paradox Gradient Analyzer (PGA)
      ↓
Coherence Tensor Engine (CTE)
      ↓
Drift Sentinel (DS)
      ↓
Structural Faultline Detector (SFD)
      ↓
Stability Basin Cartographer (SBC)
      ↓
Temporal Regime Sequencer (TRS‑Temporal)
      ↓
Cross‑Domain Causality Weaver (CW)
      ↓
Dimensional Resonance Scanner (DRS)
```

SFD is the **structural‑intelligence layer**, directly above drift‑level analysis.

---

## **10. Status**

- **Version:** 1.0  
- **Status:** canon‑stable  
- **Category:** rtt‑structural  
- **Module Path:** `/docs/rtt/Structural_Faultline_Detector/`