# 📐 L2 Spec — Tsunami Propagation — shallow-water wave simulation Mismatch-Only Spec
**ID:** `L2-289-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-289`](/artifact/l1/L1-289)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41554069
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 128 – 8192 |
| W | px | 128 – 8192 |
| Snr db | dB | 0 – 40 |
| N times | — | 100 – 100000 |
| Source error | — | 0.0 – 0.3 |
| Bathymetry error | — | 0.0 – 0.1 |
| Runup friction error | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
16.0 + 0.3*SNR_dB - 20.0*bathymetry_error - 10.0*source_error - 8.0*runup_friction_error
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`9b2f0ade093eee5b187c03d90df4b4e1104f91f6359c22a4c11e8353164fe0a0`
## 5. On-chain Registration
- **Chain hash:** `0x9767d90018a30367ebb2c49b651e1e2ba1e41388da34bc00cc632b3eee59e0f1`
- **Chain tx hash:** `0x6ad7a388acba85280c9d49cef231c44cf50810f65171d15790eabebd41088b78`
- **Chain block:** `41554069`
---
## File Mapping
This bundle consists of: `L2-289-001.md`, `L2-289-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-289-001.md` | Source of truth — edit this | Human or LLM |
| `L2-289-001.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 `L2-289-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._