# 📐 L2 Spec — Earthquake Magnitude Classification (PWDR) — Spec Skeleton
**ID:** `L2-522-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-522`](/artifact/l1/L1-522)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41554070
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| Snr db | dB | 3 – 50 |
| N stations | — | 3 – 500 |
| Sampling rate hz | Hz | 20 – 500 |
| Frequency band hz | Hz | [NEEDS_HAND_AUTHORING: bounds] |
| Station coverage gap | — | 0.0 – 0.6 |
| Near field truncation | — | [NEEDS_HAND_AUTHORING: bounds] |
| Station distance km range | — | [NEEDS_HAND_AUTHORING: bounds] |
| Magnitude scale saturation | — | [NEEDS_HAND_AUTHORING: bounds] |
| Velocity model uncertainty | — | [NEEDS_HAND_AUTHORING: bounds] |
| Hypocenter localization error | — | [NEEDS_HAND_AUTHORING: bounds] |
| Instrument response uncertainty | — | [NEEDS_HAND_AUTHORING: bounds] |
## 2. Tolerance (ε)
**Type:** `fn`
```
0.85_accuracy
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |
## 4. Fingerprint
`b7041dc091e4250fe63468362e21f7b499058a179952eb575614c0f8d918d040`
## 5. On-chain Registration
- **Chain hash:** `0x1d6617608e6e95178fa3502793fa99a783700cbb654d9d20c65958a0e86535ef`
- **Chain tx hash:** `0x854061cfad5ce38ee7ba05dca6cffe2a846cabee6a492eb3c3f0661e5f7242ce`
- **Chain block:** `41554070`
---
## File Mapping
This bundle consists of: `L2-522-001.md`, `L2-522-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-522-001.md` | Source of truth — edit this | Human or LLM |
| `L2-522-001.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 `L2-522-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._