Evidence-led learning

M1.27 — 8 km SSW of Marysville, Montana

Compare the magnitude, depth, time, and location of this earthquake observation with the local 28-event learning cohort.

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1.27magnitude ml

1.18catalog depth in km

1events at this magnitude

What this observation records

Place: 8 km SSW of Marysville, Montana
Observed: 2026-07-20T09:51:20.180Z
Updated: 2026-07-21T19:13:03.060Z
Coordinates: 46.6718, -112.3257
Depth reading: 1.18 km below the catalog reference surface

Compare with the 28-event cohort

This event is 0.28 magnitude units below the cohort median of 1.55. Its depth is 6.87 km shallower than the cohort median depth of 8.05 km.

Use the evidence

Compare this event’s magnitude with the cohort median. What is the numerical difference? Compare this event’s depth with one shallower and one deeper event. Use the time and place fields to describe what the record proves without making a prediction.My evidence note

What this observation records

Compare with the 28-event cohort

Use the evidence

Compare related local events

M1.26 — 31 km ESE of West Yellowstone, Montana

M1.32 — 27 km SSW of Mammoth, Wyoming

M1.38 — 13 km ESE of Lincoln, Montana