Earthquakes per hour
Every hour, the U.S. Geological Survey records a few hundred earthquakes worldwide. This chart plots how many. Counts do not behave like measurements: they cannot go below zero, and their spread is fixed by their average, so the limits are worked out a different way. It is the same chart you would use for defects per shift or complaints per week — and using the measurement version instead is why so many factory dashboards cry wolf.
Earthquakes per hour — count per period
No points to chart yet
This feed is connected but has not collected a full sampling period yet. The chart appears as soon as the first complete points land.
What just happened
Written out in full, the moment the chart sees it. No statistics knowledge required.
Tick a rule off and its points, its shaded runs and its card below the chart go with it — nothing is refetched, so you are looking at the same readings judged by fewer rules.
Data source: U.S. Geological Survey. Earthquake data courtesy of the U.S. Geological Survey. USGS data are in the public domain. SPC Visuals is not affiliated with U.S. Geological Survey.
Use this chart
https://www.spcvisuals.com/live/earthquake-counts
<iframe src="https://www.spcvisuals.com/live/earthquake-counts/embed" width="100%" height="440" style="border:0" title="Earthquakes per hour — live control chart"></iframe>
Free to embed, no attribution required beyond the source's own (below). The embed carries a small credit link back here.
c-chart control chart of Earthquakes per hour, drawn from U.S. Geological Survey. Limits were computed once from the first 72 points and frozen; they are never recalculated from the visible window. How these charts are built →
https://www.spcvisuals.com/live/earthquake-counts/card.png
Your data does this too
Connect a historian, a CSV, or an API. Same charts, same frozen limits, your process.