CTBTO 2026Evidence & methods

What did the hydrophones record?

Frequency-dependent response conversion produces the measured soundscape. Missing support stays missing; a gap is not silence.

Full-response 10 Hz agreement receipts

Available
Scope & evidence

16 of 16 active response bindings passed; 2 response members are not applicable because their waveform requests returned authoritative no-data

The rounding-aware comparison admits every active full-response binding without recomputation. It establishes T1 nominal-response standing only, not traceable calibration.

analysis/waveform-response-10hz-admission-audit/v1/validation.json

Validated selected holdings

Available
Scope & evidence

Hydrophone first-product families

The sealed full-active package includes all runnable exact and accepted-gap holdings. No acquisition chunk remains missing or pending; no-data, context-coverage, and response limits remain explicit.

analysis/waveform-ais-arrival-first-products/v2/full-active-current-v1/coverage.json

Remaining waveform product limits

waiting
Scope & evidence

20 requested hydrophone intervals returned no data; 20 H08N response holds; 1 context-coverage hold

Acquisition has no missing or pending chunks. These remaining scientific and response limits are not silently filled, bridged, or converted into empty products.

analysis/waveform-ais-arrival-first-products/v2/full-active-current-v1/coverage.json

Hydrophone waveform and spectral bundles

Available
Scope & evidence

217 hydrophone first-product families

Each bundle includes guarded 5–100 Hz nominal pressure, summary, periodograms, spectrogram, sliding Welch PSD, and tones.

analysis/waveform-ais-arrival-first-products/v2/full-active-current-v1/coverage.json

Guarded 5–100 Hz waveform review

Available
Scope & evidence

Held windows and complete hydrophone-hours

Every usable holding has current guarded products. The 97 blank hours and 1,067 blank band rows remain explicit gap or response-edge evidence; four no-data siblings remain unavailable.

analysis/ara-contemporary-2026-08-20-25-waveform-followup/v1/current-guarded-5-100-v1/seal-receipt.json

Combined magnitude and spatial consistency

Available
Scope & evidence

79 magnitude families for hydrophone arrays + 63 full-complex spatial bundles + 16 HA03 magnitude-only bundles

Combined products average aligned hydrophone power in linear units. Full-complex bundles preserve phase-sensitive structure where the response permits it; HA03 keeps only phase-invariant magnitude and matrix-energy quantities.

analysis/waveform-ais-arrival-first-products/v2/full-active-h03-spatial-magnitude-v1/seal-receipt.json

Supported percentile spectra for hydrophone arrays

Available
Scope & evidence

35 percentile products for hydrophone arrays

Only hydrophone array recording intervals meeting the declared support threshold are shown; missing support is never converted to zero.

analysis/waveform-ais-arrival-first-products/v2/full-active-current-v1/coverage.json

Hydrophone array percentile spectra below support

waiting
Scope & evidence

44 hydrophone array products

The declared support threshold is not met. Missing support is not converted to a zero or an empty plot.

analysis/waveform-ais-arrival-first-products/v2/full-active-current-v1/coverage.json

Standardized anomaly targets with sufficient baselines

Available
Scope & evidence

133 hydrophone + 48 hydrophone array targets

Each target-specific baseline passes the declared support and stability checks after excluding its own target hour.

analysis/waveform-ais-arrival-first-products/v2/current-background-anomaly-products-after-complete-rescue-v1/seal-receipt.json

Standardized anomaly targets with insufficient baselines

unavailable
Scope & evidence

125 hydrophone + 31 hydrophone array targets

Their target-specific baselines remain insufficient after the allowed fourth block; policy permits no fifth block.

analysis/waveform-ais-arrival-first-products/v2/current-background-anomaly-products-after-complete-rescue-v1/target-status.csv

Juan arrival-aligned measured SPL

partial
Scope & evidence

113 merged arrival windows

Available calibrated samples are plotted; unavailable intervals remain explicit gaps. This is not a complete six-hour measurement for every ship.

site/app/juan-arrivals/fixture.json