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\n\n---\n\n## Tools\n\n4 tools for querying global earthquake data from USGS and EMSC:\n\n| Tool | Description |\n|:---|:---|\n| `earthquake_get_feed` | Fetch a USGS pre-computed real-time earthquake feed by magnitude tier and time window |\n| `earthquake_search` | Search earthquakes by time range, magnitude, depth, location radius, PAGER alert level, or felt reports |\n| `earthquake_count` | Count earthquakes matching filters without fetching full records |\n| `earthquake_get_event` | Fetch complete detail for a specific earthquake by USGS event ID |\n\n### `earthquake_get_feed`\n\nFetch a USGS pre-computed real-time earthquake feed by magnitude tier and time window.\n\n- CDN-cached by USGS — faster and more available than the FDSN query API\n- Five magnitude tiers: `all` (microseisms), `1.0`, `2.5`, `4.5`, and `significant` (USGS-curated by magnitude, felt reports, and PAGER impact)\n- Four time windows: `hour`, `day`, `week`, `month`\n- Returns event list with counts and the source feed URL\n- Paged with an opaque `cursor`: `limit` bounds a page (default 100, max 1000), `totalCount` reports the whole feed, and `nextCursor` retrieves the rest — the broad tiers run past 10,000 events for `month`\n- The cursor is opaque because these feeds have no upstream paging parameter and USGS regenerates them about once a minute; a numeric offset across two calls would skip or repeat events\n- Best for real-time \"what's happening now\" queries; use `earthquake_search` for historical or filtered queries\n\n---\n\n### `earthquake_search`\n\nSearch earthquakes by time range, magnitude, depth, location radius, PAGER alert level, or felt reports.\n\n- Dual-source: USGS (global, richer metadata) or EMSC (an independent global catalog from the European-Mediterranean Seismological Centre, for cross-verification anywhere)\n- Full FDSN ComCat query API parameters: time range, magnitude, depth, location radius\n- USGS-specific filters: PAGER alert level (`green`/`yellow`/`orange`/`red`), DYFI felt reports count, significance score, event type\n- Every event carries an `event_type` in one vocabulary whichever source served it — the QuakeML names USGS publishes (`earthquake`, `quarry blast`, `explosion`, `ice quake`); EMSC's two-character code is decoded to the same names, with how sure EMSC was kept beside it in `event_certainty` — and the `event_type` filter narrows to one of them on USGS\n- Location-based queries: provide `latitude`, `longitude`, and `radius_km` together\n- Rectangular study areas: `min_latitude`, `max_latitude`, `min_longitude`, `max_longitude`, each independently optional and forwarded to both sources; combining a box with the radius circle intersects the two. Longitude accepts up to ±360 so a box can cross the antimeridian\n- Sort by time (newest first) or magnitude (largest first), ascending or descending\n- One call returns at most 20,000 events; page beyond that with `offset`, forwarded straight to the upstream FDSN `offset` parameter on both sources\n- `offset` counts from 1, matching both upstream APIs — a capped result carries `totalCount` and the `nextOffset` to pass on the following call, and says so with `countUnavailable` when the follow-up count query failed rather than leaving the total silently absent\n- Use `earthquake_count` first to gauge result size\n- USGS-specific filters are not supported by EMSC — when `source=emsc` they are dropped and named in `ignoredFilters`, so an unconstrained result set is never mistaken for a filtered one\n\n---\n\n### `earthquake_count`\n\nCount earthquakes matching filters without fetching full records.\n\n- Lightweight alternative to `earthquake_search` for statistical queries (\"how many M5+ events in 2025?\")\n- Same filter surface as `earthquake_search`: time, magnitude, depth, location radius, bounding box, PAGER, DYFI, significance, event type\n- A radius over a mining region counts quarry blasts alongside earthquakes — pass `event_type=\"earthquake\"` on USGS to exclude them\n- Returns `exceeds_limit` flag when count exceeds 20,000 — signals a full search needs paging\n- Echoes the effective query back as `queryEcho`, including the resolved time window — omitting `start_time` counts only the last 30 days\n- USGS returns the `max_allowed` cap (20,000); EMSC count endpoint does not expose this field (`max_allowed` will be null)\n- USGS-specific filters are dropped and named in `ignoredFilters` when `source=emsc`, the same as on `earthquake_search`\n\n---\n\n### `earthquake_get_event`\n\nFetch complete detail for a specific earthquake by USGS event ID.\n\n- Returns the normalized event a search result already carries, plus `detail` — a projection of the analysis products only the single-event response holds\n- `detail` groups: PAGER alert and report link, ShakeMap peak MMI/PGA/PGV and intensity map, DYFI response count and max CDI, moment-tensor scalar moment and nodal planes, landslide and liquefaction alerts, origin quality (azimuthal gap, station count, location and depth uncertainty), finite-fault rupture length and width\n- A group is omitted when USGS produced no such product — a small automatic event usually has none, a large reviewed one has most of them\n- Event IDs appear in the `id` field of `earthquake_get_feed` and `earthquake_search` results (e.g. `us6000sznj`, `hv74966427`)\n- USGS-only — EMSC events have no per-event detail endpoint\n\n## Resources\n\n| Type | URI pattern | Description |\n|:---|:---|:---|\n| Resource | `earthquake://feed/{magnitude_tier}/{time_window}` | USGS real-time earthquake feed as injectable context — returns the whole feed, so use the `earthquake_get_feed` tool for the broad tiers |\n| Resource | `earthquake://event/{event_id}` | Full USGS earthquake event detail by ID as injectable context, including the same `detail` product projection as `earthquake_get_event` |\n\n## Features\n\nBuilt on [`@cyanheads/mcp-ts-core`](https://github.com/cyanheads/mcp-ts-core):\n\n- Declarative tool definitions — single file per tool, framework handles registration and validation\n- Unified error handling across all tools\n- Pluggable auth (`none`, `jwt`, `oauth`)\n- Swappable storage backends: `in-memory`, `filesystem`, `Supabase`, `Cloudflare KV/R2/D1`\n- Structured logging with optional OpenTelemetry tracing\n- Runs locally (stdio/HTTP) or on Cloudflare Workers from the same codebase\n\nEarthquake-specific:\n\n- Two independent global data sources: USGS ComCat (full metadata) and EMSC SeismicPortal (an independent catalog from the European-Mediterranean Seismological Centre, with no PAGER/DYFI/ShakeMap metadata and station coverage densest around Europe and the Mediterranean)\n- USGS real-time GeoJSON feeds (CDN-cached, fast availability) plus FDSN event query API\n- EMSC FDSN-WS event and count endpoints\n- No API key required — both USGS and EMSC are fully public\n\nAgent-friendly output:\n\n- Source attribution on every response (`usgs` / `emsc`) so agents can reason about data provenance\n- `exceeds_limit` flag on count responses surfaces truncation risk before a full search\n- Fields a source does not publish come back `null`, never as a fabricated zero — `tsunami` and `status` are null on EMSC events, and the rendered text says \"not published by source\" rather than \"no tsunami\" or \"reviewed\"\n- `source_catalog` and `auth` carry provenance (which catalog and which authoritative agency produced a solution) so agents can weigh two sources against each other\n- USGS-only filters dropped for an EMSC query are named in `ignoredFilters` on both `earthquake_search` and `earthquake_count`\n- An upstream rejection surfaces the service's own explanation (the offending parameter and its accepted format) in the error message, not just a status code; when the service explains nothing, the error says so under its own reason rather than passing the raw upstream body through\n- `event_type` travels with every event, so a quarry blast or explosion is never silently read as an earthquake, and `event_certainty` keeps a suspected one from reading as confirmed\n\n## Getting started\n\n### Public Hosted Instance\n\nA public instance is available at `https://earthquake.caseyjhand.com/mcp` — no installation required. Point any MCP client at it via Streamable HTTP:\n\n```json\n{\n \"mcpServers\": {\n \"earthquake-mcp-server\": {\n \"type\": \"streamable-http\",\n \"url\": \"https://earthquake.caseyjhand.com/mcp\"\n }\n }\n}\n```\n\n### Self-Hosted / Local\n\nAdd the following to your MCP client configuration file.\n\n```json\n{\n \"mcpServers\": {\n \"earthquake-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"bunx\",\n \"args\": [\"@cyanheads/earthquake-mcp-server@latest\"],\n \"env\": {\n \"MCP_TRANSPORT_TYPE\": \"stdio\",\n \"MCP_LOG_LEVEL\": \"info\"\n }\n }\n }\n}\n```\n\nOr with npx (no Bun required):\n\n```json\n{\n \"mcpServers\": {\n \"earthquake-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"npx\",\n \"args\": [\"-y\", \"@cyanheads/earthquake-mcp-server@latest\"],\n \"env\": {\n \"MCP_TRANSPORT_TYPE\": \"stdio\",\n \"MCP_LOG_LEVEL\": \"info\"\n }\n }\n }\n}\n```\n\nOr with Docker:\n\n```json\n{\n \"mcpServers\": {\n \"earthquake-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"docker\",\n \"args\": [\"run\", \"-i\", \"--rm\", \"-e\", \"MCP_TRANSPORT_TYPE=stdio\", \"ghcr.io/cyanheads/earthquake-mcp-server:latest\"]\n }\n }\n}\n```\n\nFor Streamable HTTP, set the transport and start the server:\n\n```sh\nMCP_TRANSPORT_TYPE=http MCP_HTTP_PORT=3010 bun run start:http\n# Server listens at http://localhost:3010/mcp\n```\n\n### Prerequisites\n\n- [Bun v1.3.0](https://bun.sh/) or higher.\n- No API keys required — USGS and EMSC data is fully public.\n\n### Installation\n\n1. **Clone the repository:**\n\n```sh\ngit clone https://github.com/cyanheads/earthquake-mcp-server.git\n```\n\n2. **Navigate into the directory:**\n\n```sh\ncd earthquake-mcp-server\n```\n\n3. **Install dependencies:**\n\n```sh\nbun install\n```\n\n## Configuration\n\nAll configuration is validated at startup via Zod schemas in `src/config/server-config.ts`. Key environment variables:\n\n| Variable | Description | Default |\n|:---|:---|:---|\n| `MCP_TRANSPORT_TYPE` | Transport: `stdio` or `http` | `stdio` |\n| `MCP_HTTP_PORT` | HTTP server port | `3010` |\n| `MCP_HTTP_ENDPOINT_PATH` | HTTP endpoint path where the MCP server is mounted | `/mcp` |\n| `MCP_PUBLIC_URL` | Public origin override for TLS-terminating reverse-proxy deployments | none |\n| `MCP_SESSION_MODE` | HTTP session handling: `stateful`, `stateless`, or `auto`. The Docker image and `.env.example` ship `stateless`. | `auto` (resolves to `stateful`) |\n| `MCP_AUTH_MODE` | Authentication: `none`, `jwt`, or `oauth` | `none` |\n| `MCP_LOG_LEVEL` | Log level (`debug`, `info`, `warning`, `error`, etc.) | `info` |\n| `MCP_GC_PRESSURE_INTERVAL_MS` | Opt-in Bun-only forced-GC pressure loop (ms). Try `60000` if heap growth is observed under sustained HTTP load. | `0` (disabled) |\n| `LOGS_DIR` | Directory for log files (Node.js only) | `/logs` |\n| `STORAGE_PROVIDER_TYPE` | Storage backend: `in-memory`, `filesystem`, `supabase`, `cloudflare-kv/r2/d1` | `in-memory` |\n| `USGS_BASE_URL` | USGS API base URL. Override for testing or mirroring. | `https://earthquake.usgs.gov` |\n| `EMSC_BASE_URL` | EMSC API base URL. Override for testing or mirroring. | `https://www.seismicportal.eu` |\n| `DEFAULT_LIMIT` | Default result limit for `earthquake_search` | `100` |\n| `REQUEST_TIMEOUT_MS` | HTTP timeout in milliseconds for upstream API calls | `10000` |\n| `OTEL_ENABLED` | Enable OpenTelemetry | `false` |\n\n## Running the server\n\n### Local development\n\n- **Build and run the production version**:\n\n ```sh\n # One-time build\n bun run rebuild\n\n # Run the built server\n bun run start:http\n # or\n bun run start:stdio\n ```\n\n- **Run checks and tests**:\n ```sh\n bun run devcheck # Lints, formats, type-checks, and more\n bun run test # Runs the test suite\n ```\n\n## Project structure\n\n| Directory | Purpose |\n|:---|:---|\n| `src/mcp-server/tools` | Tool definitions (`*.tool.ts`). Four tools across USGS and EMSC. |\n| `src/mcp-server/resources` | Resource definitions. Feed and event resources. |\n| `src/services/usgs` | USGS ComCat service — GeoJSON feed fetcher and FDSN query API client. |\n| `src/services/emsc` | EMSC SeismicPortal service — FDSN event search and count endpoints. |\n| `src/config` | Server-specific environment variable parsing and validation with Zod. |\n| `tests/` | Unit and integration tests, mirroring the `src/` structure. |\n\n## Development guide\n\nSee [`CLAUDE.md`](./CLAUDE.md) for development guidelines and architectural rules. The short version:\n\n- Handlers throw, framework catches — no `try/catch` in tool logic\n- Use `ctx.log` for logging, `ctx.state` for storage\n- Register new tools and resources in the `createApp()` arrays\n\n## Contributing\n\nIssues and pull requests are welcome. Run checks and tests before submitting:\n\n```sh\nbun run devcheck\nbun run test\n```\n\n## License\n\nThis project is licensed under the Apache 2.0 License. See the [LICENSE](./LICENSE) file for details.\n",
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