# 📐  L2 Spec — Seismic Rock Physics (Gassmann) — Nominal + Mismatch Specs

**ID:** `L2-463-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-463`](/artifact/l1/L1-463)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.38 · **Delta tier:** 5
> **⛓ On-chain block:** 41555283

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| Porosity phi | — | 0.05 – 0.4 |
| Saturation sw | — | 0.0 – 1.0 |
| Clay content vcl | — | 0.0 – 0.6 |
| Differential pressure mpa | — | 5 – 80 |

## 2. Tolerance (ε)

**Type:** `fn`

```
30 + 20 * (clay_content_Vcl / 0.1) ** 0.3
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.38 |
| Delta tier | 5 |

## 4. Fingerprint

`19fac9e5cdc703c5632921a999a8ebceebf616d07a43b54e9ccfc014c243def1`

## 5. On-chain Registration

- **Chain hash:** `0x9ceb10d8af7f2d44eb96299345263a55ab2eab22225d31dbf40cc0077d0ef819`
- **Chain tx hash:** `0x35afc50e4ce5e56cf5e0320a4e4a1c18d4ea923ec6b12e5ec7637a4d5ba8b7de`
- **Chain block:** `41555283`

---

## File Mapping

This bundle consists of: `L2-463-001.md`, `L2-463-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-463-001.md` | Source of truth — edit this | Human or LLM |
| `L2-463-001.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 `L2-463-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._