How to measure any disturbance in a signal that is exceeding a threshold?

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Assuming having a noisy signal as attached, I'm interested in measuring any disturbance that exceeds a threshold, i.e., 0.12. How can I do that?
Thanks in advance!
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Susan le 20 Jan 2023
@Walter Roberson Thanks for your response.The 0.12 is an absolute of the disturbance peak-to-peak value.

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Walter Roberson
Walter Roberson le 19 Jan 2023
wherebig = find(Yvf > 0.12);
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Walter Roberson
Walter Roberson le 24 Jan 2023
Which one you would use (or which options for findpeaks()) would depend on whether you need to know the immediate start of the disturbance crossing a threshold, or if you want instead to know where the peak of the disturbance was.

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