CTBTO 2026Evidence & methods

Arrival windows

Frequency (Hz)

Partial measured support · grey intervals are unavailable.

Measured spectral SPL through UTC at 63 HzThe dark curve is measured whole-soundscape spectral SPL. Black vertical lines mark estimated ship arrivals and do not assert detection or attribution. Grey bands show unavailable calibrated PSD support.808386899295Unavailable: 2025-01-12 00:15:05.996 UTC to 2025-01-12 02:45:05.546 UTCUnavailable: 2025-01-12 03:45:06.693 UTC to 2025-01-12 09:00:58.237 UTCBulker · 2025-01-12 03:15:05.996 UTCContainer Ship · 2025-01-12 03:31:14.065 UTCBulker · 2025-01-12 04:17:55.862 UTCContainer Ship · 2025-01-12 04:35:51.854 UTCBulker · 2025-01-12 05:20:56.309 UTCContainer Ship · 2025-01-12 06:00:58.237 UTC2025-01-12 02:50:05.548 UTC: 86.0 dB re 1 µPa² / Hz2025-01-12 02:53:05.548 UTC: 86.1 dB re 1 µPa² / Hz2025-01-12 02:56:05.548 UTC: 86.6 dB re 1 µPa² / Hz2025-01-12 02:59:05.548 UTC: 87.7 dB re 1 µPa² / Hz2025-01-12 03:02:05.548 UTC: 88.2 dB re 1 µPa² / Hz2025-01-12 03:05:05.548 UTC: 88.4 dB re 1 µPa² / Hz2025-01-12 03:08:05.548 UTC: 87.4 dB re 1 µPa² / Hz2025-01-12 03:11:05.548 UTC: 87.2 dB re 1 µPa² / Hz2025-01-12 03:14:05.548 UTC: 90.0 dB re 1 µPa² / Hz2025-01-12 03:17:05.548 UTC: 91.3 dB re 1 µPa² / Hz2025-01-12 03:20:05.548 UTC: 91.5 dB re 1 µPa² / Hz2025-01-12 03:23:05.548 UTC: 91.3 dB re 1 µPa² / Hz2025-01-12 03:26:05.548 UTC: 89.0 dB re 1 µPa² / Hz2025-01-12 03:29:05.548 UTC: 89.0 dB re 1 µPa² / Hz2025-01-12 03:32:05.548 UTC: 88.7 dB re 1 µPa² / Hz2025-01-12 03:35:05.548 UTC: 88.0 dB re 1 µPa² / Hz2025-01-12 03:38:05.548 UTC: 88.1 dB re 1 µPa² / Hz2025-01-1200:15 UTC2025-01-1202:26 UTC2025-01-1204:38 UTC2025-01-1206:49 UTC2025-01-1209:00 UTCUTCSpectral SPL (dB re 1 µPa² / Hz)
Selected vessel & predicted level
Selected arrival

Bulker

1 / 6
AIS source UTC
2025-01-12 03:14:48 UTC
Estimated arrival UTC
2025-01-12 03:15:05.996 UTC
Range
27.0 km
Vessel inputs
334 m · 19 kn
Spectral SL
177.2 dB re 1 µPa² m² / Hz
Exact RAM TL at 6 m
93.5 dB
Modeled single-vessel Spectral RL
83.6 dB re 1 µPa² / Hz
Definitions and data standing

The line is measured whole-soundscape Spectral SPL. RAM TL and modeled single-vessel Spectral RL are marker context only.

17 QC-valid time points · partial window support. Nearest retained FFT: 62.98828 Hz.

Estimated arrival is AIS source UTC plus the retained source-to-receiver range divided by 1,500 m/s. Each plot is the exact maximal union of overlapping or endpoint-touching ±3-hour member windows.

Measured values reuse calibrated hydrophone-array combined Sliding Welch PSDs at the nearest retained FFT bin. Invalid QC cells and unavailable intervals are not bridged. Exact RAM campaign: incremental or complete derivative available.

Selected member identity: ha01-full-au-v1-78e70b05ac6d9f7a64e4b457. Arrival geometry: H01W using receiver.h01w.virtual_node_mean.v1.

Claim limit

Arrival-aligned descriptive measured soundscape with separately modeled single-vessel context; no ship detection, contribution estimate, attribution, causality, or model validation.

Context & definitions

Backwards · Juan 674

Measured soundscape around estimated ship arrivals

113 maximal H01W windows · 674 AIS arrivals