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pulse
Ulaanbaatar, Mongolia (seismic station ULN)

This near-real-time audio stream originates from a seismometer at Ulaanbaatar, Mongolia (IRIS/USGS station ULN). The low-frequency sounds of the solid Earth have been sped up by a factor of 900× to make them audible. As a result, frequencies have been transposed upward about 10 octaves. Each successive audio program (separated by a brief pause) compresses the last 48 hours into about 3 minutes (exactly 03:12) of listening time.

Spectrogram loading...

Annotated events during this period:

Technical details:

Status :   (Operating normally)
Manual flags : (none)
Station : ULN (net: IRIS/USGS) at Ulaanbaatar, Mongolia
Sensor : STS-1V/VBB
Recorder : Quanterra QX80 @ 20 Hz
Pod : ms-rhea@x.x.31.38 | macOS 12.6.4 | psm v. 176
Last heard from pod : Fri Apr 12 17:24:03 UTC 2024 (45 seconds ago)
Speedup : ×900
Loop duration (real) : 48 hours
Loop duration (audio) : 03:12 (stereo)
Data channels : miniseed (IU.ULN.00.BH1 IU.ULN.00.BH2)
Spectrogram type : post-processed data
Gain correction : 25 dB
SoX post-processing : highpass -2 90 highpass -2 90
compand 0.001,0.01 6:-80,-50,-40,-10,0,-3
Archives : 2024 | 2023 | 2022 | 2021 | 2020 | 2019
Audio Stream : https://audibleearth.com/proxy/es21/stream (es21@8040)
Latest factoids : uln.9.factoids.txt