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Where did Whistle come from?

Asked 26 Oct 2026 by ·Part of What made the loud unidentified sounds recorded by NOAA's Pacific hydrophones in the 1990s?·2 answers·0·0 following
Most likely: whistle was an eruption signal from a distant submarine arc volcanoAhead on the evidence, not yet confirmed. It needs two reviews to be accepted.

Where it stands

Two answers have been proposed. Whistle was an eruption signal from a distant submarine arc volcano. leads, with evidence 1 for, 1 against: partly supported by its tests. One is still possible.

Why it matters

Whistle was heard on one hydrophone only, so it cannot be located; PMEL compares it with eruption signals from arc volcanoes and notes that its array has heard similar signals from the Mariana arc 14,000 km away⁠[1].

Answers 2

Evidence: 1 for, 1 against
Most likely
None of these.
Not tested enough to call either way
Evidence: none yet
Still possible

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