# 📐 L2 Spec — Surface Wave Dispersion — shallow Vs profile inversion Mismatch-Only Spec
**ID:** `L2-274-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-274`](/artifact/l1/L1-274)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41554054
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| Snr db | dB | 0 – 40 |
| N freqs | — | 10 – 500 |
| N layers | — | 2 – 100 |
| Vp prior error | — | 0.0 – 0.2 |
| Density prior error | — | 0.0 – 0.1 |
| Higher mode contamination | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
2.0 + 15.0*vp_prior_error + 8.0*density_prior_error + 10.0*higher_mode_contamination
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`6ca9a8f4da6299ca44d0e18678285acf7b6564bdcc9c316ff3fa84f9a747fc25`
## 5. On-chain Registration
- **Chain hash:** `0xbbea31054e372988120f6aeaff835560a8ef39de65d25f548df51bdc19a233a9`
- **Chain tx hash:** `0x594acfb0f0a47b2823a6e03ff3220a2798471c92c3fe05c0cac44664b9830d4d`
- **Chain block:** `41554054`
---
## File Mapping
This bundle consists of: `L2-274-001.md`, `L2-274-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-274-001.md` | Source of truth — edit this | Human or LLM |
| `L2-274-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-274-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._