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The result of wakeful EEG shows persistent activation of temporal lobes - high level of delta and theta waves in the left temporal lobe (3 on the scale from -3 to 3) and slightly lower in the right temporal lobe.
The sources that I found state that delta and theta waves are typically associated with the state of sleeping, though.

https://en.wikipedia.org/wiki/Delta_wave
https://en.wikipedia.org/wiki/Theta_wave

What are possible explanations of such activity when the subject is awake?

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    $\begingroup$ Welcome to Psychology.SE. We work differently to most SE sites, where we have a strict policy that all questions should show evidence of prior research. Please help us to help you and edit your question to provide more information on what you have read on this subject, what made you ask this question, and any problems you are having understanding your research. If you found nothing, what did you Google? This helps to provide an answer which will be more helpful. $\endgroup$ – Chris Rogers Jun 10 '19 at 10:10
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    $\begingroup$ @user855286 I think there needs to be more context before this can be attempted to be answered. What is the recording condition? Why are you asking this question? Why is the scale "-3 to 3"? What does the rest of the spectrum look like? $\endgroup$ – Bryan Krause Jun 10 '19 at 19:25
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    $\begingroup$ @user855286 It ranges from nothing to anything, so speculating isn't going to be very useful and just lead to "WebMD syndrome" $\endgroup$ – Bryan Krause Jun 10 '19 at 19:54
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    $\begingroup$ @user855286 Yes, because this site does not provide personal medical advice. $\endgroup$ – Bryan Krause Jun 10 '19 at 20:09
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    $\begingroup$ @user855286 The two answers at psychology.stackexchange.com/questions/20075/… might be of interest to you if you are wondering about where different frequency "waves" come from rather than plausible diagnoses. $\endgroup$ – Bryan Krause Jun 10 '19 at 20:32
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According to this article, the localized increase in delta and theta waves is a known anomaly in EEG, is referred to as "focal slow activity" and it the case of a wakeful EEG of an adult it usually suggests an organic damage or disfunction of the affected area, but extra tests are required to narrow down the list of possibilities.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0004-282X2011000600020

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