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GET /v1/moment-magnitude

Moment magnitude

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10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.

Custom headers (optional)
api.oanor.com/richter-api

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Code snippets

curl "https://api.oanor.com/richter-api/v1/moment-magnitude" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/richter-api/v1/moment-magnitude", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/richter-api/v1/moment-magnitude");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);
import requests
requests.get(
    "https://api.oanor.com/richter-api/v1/moment-magnitude",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "note": "Hanks-Kanamori: Mw = (2/3)·log10(M0) − 6.07, with the seismic moment M0 in newton-metres (M0 = μ·A·d: rigidity × rupture area × slip).",
        "inputs": {
            "seismic_moment_nm": 1.0e+19
        },
        "classification": "strong (damage in populated areas)",
        "moment_magnitude": 6.5967
    },
    "meta": {
        "timestamp": "2026-06-05T11:30:36.156Z",
        "request_id": "70985fa7-6378-4a22-ac8a-122c44da7ce3"
    },
    "status": "ok",
    "message": "Moment magnitude",
    "success": true
}