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3.7‑Magnitude Quake Shakes Sandolândia, Tocantins

Limited local monitoring leaves the quake’s depth and recurrence unclear despite experts saying shocks of this size rarely cause structural damage.

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Overview

  • The Centro de Sismologia da USP recorded a magnitude 3.7 tremor near Sandolândia on Thursday, September 4 at 08:45 UTC with coordinates 12.68°S, 50.46°W and a depth fixed at 0 km in the report.
  • Some residents reported feeling light shaking in the town of about 3,900 people but there were no reports of damage to buildings or injuries.
  • USP sismologist José Alexandre Nogueira said earthquakes of magnitude 3–4 typically produce perceptible but non‑destructive shaking, especially in sparsely populated areas.
  • Seismologists warned that the 0 km depth is a placeholder used when instruments cannot constrain depth and that sparse seismograph coverage in southern Tocantins makes it hard to estimate recurrence intervals.
  • Local officials have not publicly confirmed a municipal record of the event as of the latest report and the tremor follows a smaller magnitude 2.8 event near Gurupi in May 2026 and earlier activity in May 2024.