Seismic and Volcanic
Why this is rated elevated
USGS data as of 2026-09-28 show 39 US earthquakes of magnitude 4.5 or greater in the past 30 days, at or above the elevated threshold of 20. The largest were an M6.5 on 2026-09-17 and an M6.3 on 2026-09-03, both near Nikolski, Alaska. Four volcanoes are at advisory level or higher: Great Sitkin (Watch/Orange), Kilauea (Watch/Orange), Shishaldin (Advisory/Yellow), and Ahyi Seamount (Advisory/Yellow), below the elevated threshold of 4 for that indicator.
Elevated: Some indicators are outside normal ranges or a known risk is developing. Core functions are unaffected. Methodology
What is this?
This tracks earthquakes and volcanoes in the US.
How it's doing: Still working, but something is a little off.
About this area
Tracks significant earthquakes and volcanic alert levels in the US. The earthquake indicator counts US events of magnitude 4.5 or greater over the trailing 30 days; the volcano indicator counts US volcanoes at aviation color code yellow/advisory or higher. The earthquake count is the elevated driver here: 39 events in the past 30 days, concentrated in the Aleutians near Nikolski, Alaska, with the largest at M6.5 on 2026-09-17 and M6.3 on 2026-09-03. Four volcanoes carry elevated statuses, two at Watch/Orange (Great Sitkin, Kilauea) and two at Advisory/Yellow (Shishaldin, Ahyi Seamount).
Indicators
Latest readings. Changes are shown without judgment of whether up or down is better.
| Indicator | Latest |
|---|---|
US earthquakes M4.5+ (30-day) Count of US earthquakes of magnitude 4.5 or greater in the trailing 30 days, per the USGS latest earthquakes feed. Source: U.S. Geological Survey | 39events |
Volcanoes at advisory or higher US volcanoes at aviation color code yellow/advisory or higher: Great Sitkin (Watch/Orange), Kilauea (Watch/Orange), Shishaldin (Advisory/Yellow), Ahyi Seamount (Advisory/Yellow). Source: U.S. Geological Survey | 4volcanoes |
Timeline of developments
Great Sitkin and Shishaldin notices issued by AVO (opens original release)
Alaska Volcano Observatory notices dated 2026-09-27 list Great Sitkin at Watch/Orange and Shishaldin at Advisory/Yellow.
Source: U.S. Geological SurveyKilauea at Watch/Orange per HVO notice (opens original release)
Hawaiian Volcano Observatory notice dated 2026-09-27 lists Kilauea at Watch/Orange.
Source: U.S. Geological SurveyAhyi Seamount at Advisory/Yellow per NMI notice (opens original release)
Northern Mariana Islands notice dated 2026-09-24 lists Ahyi Seamount at Advisory/Yellow.
Source: U.S. Geological SurveyM6.5 earthquake west of Nikolski, Alaska (opens original release)
The largest US earthquake of the past 30 days, recorded 177 km W of Nikolski, Alaska on 2026-09-17, with a tsunami flag and a green PAGER alert.
Source: U.S. Geological SurveyM6.3 earthquake southwest of Nikolski, Alaska (opens original release)
Recorded 89 km SSW of Nikolski, Alaska on 2026-09-03, with a tsunami flag and a green PAGER alert; several M5+ aftershocks followed in the same area.
Source: U.S. Geological Survey
Sources and citationsWhere this info comes from
- 1.Latest earthquakes map
U.S. Geological Survey. Accessed Sep 27, 2026.
- 2.Volcano updates
U.S. Geological Survey. Accessed Sep 27, 2026.
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