Earthquake record › Montana

Montana in the Sealed USGS Record

42 events whose USGS place string ends in Montana, across 20 of our daily seals. Counts are of what we sealed, not of what occurred.

What this archive is, exactly. The USGS all_day feed holds the last 24 hours and is overwritten in place. We seal one dated copy of it per day. An event that appeared in the feed and was superseded between two of our seals is not in this archive at all. These pages are a record of what USGS asserted at each seal — they are not a complete catalogue of earthquakes, and nothing here should be read as one.

Review status as sealed: reviewed 42. An automatic value is a machine solution USGS may still revise; a reviewed value has had a human look at it. Which one you are reading matters more than the magnitude itself.

By magnitude

MagnitudeEvents
Below M1.019
M1.0 – M1.919
M2.0 – M2.93
M3.0 – M3.91
M4.0 – M4.90
M5.0 and above0
No magnitude published0

0 of 42 events in Montana were sealed at or above M3.5 — the magnitude Texas Railroad Commission seismic-response conditions are written around. That is a count of what the feed said, not a determination about any permit, operator or well.

Get told when the record changes for Montana

USGS publishes the last day and overwrites it, then revises events in place — automatic becomes reviewed, magnitudes move, and the old value stops existing everywhere. We seal a dated copy every day. Leave your email and we'll tell you when an event in Montana is revised after the fact, with what it said before.

Email me revisions for Montana →

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Narrower views

Present but below our page threshold, so named here instead of given a page: M2.0 – M2.9 (3), M3.0 – M3.9 (1).

Largest events on record here

MagnitudePlace, as publishedReview statusSeal
M3.3019 km S of Lima, Montanareviewed2026-07-01
M2.6025 km ENE of Seeley Lake, Montanareviewed2026-07-13
M2.2026 km SE of Dillon, Montanareviewed2026-06-24
M2.0037 km S of Silver Gate, Montanareviewed2026-07-28
M1.9924 km SSW of Silver Gate, Montanareviewed2026-08-06
M1.9124 km ENE of West Yellowstone, Montanareviewed2026-07-24
M1.8015 km ENE of Hebgen Lake Estates, Montanareviewed2026-06-24
M1.690 km NNW of South Hills, Montanareviewed2026-07-30
M1.5614 km ENE of Hebgen Lake Estates, Montanareviewed2026-06-23
M1.5230 km ESE of West Yellowstone, Montanareviewed2026-07-18
M1.4514 km E of Hebgen Lake Estates, Montanareviewed2026-07-02
M1.417 km ENE of West Yellowstone, Montanareviewed2026-07-17
M1.404 km WSW of Hebgen Lake Estates, Montanareviewed2026-07-08
M1.3830 km ESE of West Yellowstone, Montanareviewed2026-07-18
M1.3230 km ESE of West Yellowstone, Montanareviewed2026-07-18
M1.2825 km ENE of West Yellowstone, Montanareviewed2026-06-25
M1.2631 km ESE of West Yellowstone, Montanareviewed2026-07-18
M1.2419 km WSW of Alder, Montanareviewed2026-07-28
M1.2114 km NNE of West Yellowstone, Montanareviewed2026-07-07
M1.0816 km E of Hebgen Lake Estates, Montanareviewed2026-07-21
How this page decides a place is in Montana. USGS writes the region after the last comma of the place string, and we map that tail from an explicit table — we never geocode the coordinates. An event just offshore or just over a border is assigned the way USGS wrote it, and an event whose place string carries no comma is never assigned here at all. The complete table is on the methodology page.
Days we did not seal. 45 seals span 47 calendar days, so these days inside the span have no sealed copy: 2026-07-04, 2026-07-15. A missing day means we did not read the feed. It does not mean nothing happened, and those dates return a 404 here rather than a page reading zero.
One seal is wider than the others. These dates were collected more than once: 2026-07-16 (2 runs, 00:48 and 13:42 UTC). A day with two runs covers more than 24 source-hours, so its event count is larger for a collection reason and not a seismic one. Do not read it as a busy day.

Compiled from dated copies of the U.S. Geological Survey's public all_day realtime feed (a work of the US government, in the public domain). Values are reproduced exactly as USGS published them on the date shown and may since have been revised; USGS is the authority on the current value of any event. These pages are provided for informational purposes only, carry no warranty of accuracy or completeness, and are not an earthquake warning, a safety notice, or engineering advice. Always verify against the USGS Earthquake Hazards Program before relying on any figure.

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