What is omori-utsu-analysis?

A fitting workflow for the Omori–Utsu model, which describes how earthquake aftershock rates usually decline after a mainshock.

Use it to fit one aftershock sequence, inspect decay parameters and residuals, and retain the event data, charts, tables, and provenance for review.

It requires the completeness threshold, time window, magnitude rules, bins, and parameter limits to be supplied and reports when the data are insufficient or the fit reaches a limit.

omori-utsu-analysis — Skill for Claude Code and Codex by agentlas-ai

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add agentlas-ai/agentlas-desktop --skill omori-utsu-analysis

Clone the repo

git clone --depth 1 https://github.com/agentlas-ai/agentlas-desktop

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/agentlas-ai/agentlas-desktop/omori-utsu-analysis/github.svg)](https://agentmods.dev/skills/agentlas-ai/agentlas-desktop/omori-utsu-analysis)

Your own site

<a href="https://agentmods.dev/skills/agentlas-ai/agentlas-desktop/omori-utsu-analysis"><img src="https://agentmods.dev/badge/skills/agentlas-ai/agentlas-desktop/omori-utsu-analysis/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/agentlas-ai/agentlas-desktop/omori-utsu-analysis"><img src="https://agentmods.dev/badge/skills/agentlas-ai/agentlas-desktop/omori-utsu-analysis.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 42 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 360 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00042	$0.00360
Opus 5.5	$0.00017	$0.00144
Sonnet 5.5	$0.00008	$0.00072
Haiku 4.5	$0.00004	$0.00036

Measured 1mo ago against content hash 3e9d478e6bb5, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

omori-utsu-analysis scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/agentlas-earth-science/skills/omori-utsu-analysis/SKILL.md · 15 lines

What it actually says

Omori–Utsu aftershock analysis

Obtain one complete first-page catalog with search_usgs_earthquakes. Narrow the time, magnitude, or spatial query until pagination.completeness is page-complete; never splice pages or discard the raw/normalized receipts.
Ask the researcher for the mainshock instant, inclusive observation start/end, the time after which the catalog is considered complete, magnitude completeness Mc, one exact magnitude type, fixed rate-bin width in seconds, and bounded p and c ranges. Do not infer any of these scientific boundaries.
Call analyze_usgs_omori_utsu. Treat only status: complete as an interior numerical optimum. Surface insufficient-data and every statusReasons item. A parameter-boundary optimum is invalid; widen or scientifically revise the bounds rather than relabeling it.
Keep the event audit, publication table, both Vega-Lite payloads, source hashes, content receipts, and overall analysis SHA-256 together. Zero-count bins are observations and must remain in tables and residual diagnostics.
Report p, c in seconds, and K with its declared unit. State that the model is a single-sequence non-homogeneous Poisson fit and does not model background seismicity, secondary triggering, declustering, confidence intervals, forecast skill, or causality.

The host supplies Vega rendering. This plugin returns deterministic specifications and does not bundle a renderer.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

1mo ago First seen · 15 lines · 42 tokens per session scan A 3e9d478e6bb5

Subscribe to this mod's changes

omori-utsu-analysis is a skill published in the GitHub repository agentlas-ai/agentlas-desktop (6 stars, last pushed yesterday), licensed Apache-2.0. It adds 42 tokens to every session and 360 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-04.

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