<p>I often have to deal with spectrograms similar to the one below, I have some ideas as to what the different signatures might come from but I still have some doubts. Do you have any idea as to what that might be.</p>
<p>I suspect the low frequency (100Hz) signal to be hydrophone noise, but the higher frequency signal seems to high to be blue whales.</p>
<p>Some context: This spectrogram is from a tagged elephant seal out at sea in the southern Indian Ocean. He is drifting passively (ie sleeping) at 100m depth.</p>
<p>Any help would be appreciated :)</p>
<p><a href="https://i.sstatic.net/nSJrmzPN.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/nSJrmzPN.png" alt="Beautiful spectrogram" /></a></p>

CC BY-SA 4.0
2024-06-03T16:18:44.493Z
yes indeed @Noil
Anatoole
CC BY-SA 4.0
2024-06-11T14:36:10.840Z
Could there be humpback whales in the area?
selene
CC BY-SA 4.0
2024-06-12T09:43:17.757Z
@selene Yes. Humpbacks or Southern right whales
Anatoole
CC BY-SA 4.0
2024-06-12T15:20:37.433Z
I am not an expert on low frequency whale sounds, but the variety and frequency of a few hundred Hz could maybe be humpback whales. Can you add some info about the season and more specifically the location to your question? A quick google search of 'humpback whale song southern indian ocean' gave me this paper that might be useful [Murray et al. 2012](https://onlinelibrary.wiley.com/doi/full/10.1111/j.1748-7692.2011.00484.x?casa_token=0GYKpYsB3L8AAAAA%3AyOzK-KWA6ejAdmmuvs8GB1RSFOxzgUKJhMDMnZhRdrc8qYvcRlB05F4l-8x2Re_DPorwkweCU91Wsrc)
selene
<hydrophone><call-identification>
Unknown underwater acoustic sound source
# Unknown underwater acoustic sound source

(Asked by: username_0 on 2024-06-03)

I often have to deal with spectrograms similar to the one below, I have some ideas as to what the different signatures might come from but I still have some doubts. Do you have any idea as to what that might be.

I suspect the low frequency (100Hz) signal to be hydrophone noise, but the higher frequency signal seems to high to be blue whales.

Some context: This spectrogram is from a tagged elephant seal out at sea in the southern Indian Ocean. He is drifting passively (ie sleeping) at 100m depth.

Any help would be appreciated :)

[![Beautiful spectrogram](https://i.sstatic.net/nSJrmzPN.png)](https://i.sstatic.net/nSJrmzPN.png)

**Tags:** hydrophone, call-identification

> **Comments:**
> **username_0**: yes indeed @Noil  
> **username_1**: Could there be humpback whales in the area?  
> **username_0**: @username_1 Yes. Humpbacks or Southern right whales  
> **username_1**: I am not an expert on low frequency whale sounds, but the variety and frequency of a few hundred Hz could maybe be humpback whales. Can you add some info about the season and more specifically the location to your question? A quick google search of 'humpback whale song southern indian ocean' gave me this paper that might be useful [Murray et al. 2012](https://onlinelibrary.wiley.com/doi/full/10.1111/j.1748-7692.2011.00484.x?casa_token=0GYKpYsB3L8AAAAA%3AyOzK-KWA6ejAdmmuvs8GB1RSFOxzgUKJhMDMnZhRdrc8qYvcRlB05F4l-8x2Re_DPorwkweCU91Wsrc)  

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## 0 answers

