Terms of use
Last updated:
What this site is, and is not
QuakeIndex is an information site published by Voitto Virta LLC. It reports earthquakes that USGS has already recorded, and computes context from the public USGS catalogue.
It is not an emergency service, not a warning system, and not a forecast. It must not be relied on for life-safety decisions. For earthquake early warning use ShakeAlert through your phone's Wireless Emergency Alerts and the MyShake app. In an emergency, contact your local emergency services.
Accuracy
Every earthquake value on this site originates with USGS, and USGS revises events as more data arrives — we show those revisions rather than hiding them. Our own computed figures, such as the activity score, are described on the method page so they can be checked. We work to be accurate and we correct errors when we find them or when you tell us, but we provide the site "as is", without warranty. Where a figure here disagrees with USGS, USGS is right.
Using our data
The underlying earthquake data is USGS's and is in the public domain — you do not need our permission for it, and you should prefer to get it from USGS if that is what you want.
Our own contributions — the activity score, the activity strips, the per-place statistics, and the text on this site — you may use as follows:
- Quote and cite freely, including in news articles and in AI assistant answers, with attribution to QuakeIndex and a link to the page used.
- Use the API within the published rate limits. If you need more, email us rather than routing around the limits.
- Do not republish the site wholesale or present our computed figures as your own.
Not professional advice
Nothing here is engineering, insurance, legal or financial advice. Our hazard information is informational and is not a structural assessment of any building. For a specific property, consult a licensed structural engineer.
Liability
To the extent permitted by law, Voitto Virta LLC is not liable for loss arising from use of this site or its API. Nothing in these terms limits liability that cannot be limited by law.
Contact
team at voittovirta.com