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What are possible reasons why my 2018 Honda CIVIC Sedan with 26000 miles (purchased pre-owned from a Honda dealer about one year ago) experiences these rare vibrations?
Within the last couple of months, my vehicle experienced vibrations twice - yet I cannot find a common thread regarding specific times of the vibrations e.g, driving conditions, etc.

 
Rep Power: 367

what rare vibration do you mean? whole car? parts of the car? underhood? wheel?
please leaborate

 
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The under-hood / engine region seems to be where these vibrations originate.

 
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how does it sounds? high pitch, low pitch, loud, medium, etc

 
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Sound can be described as medium in pitch/tone.

 
Rep Power: 367

i would recommend taking to a shop when it happens, written descriptions are not being much help...
or open hood, lift the car, start prodding everything.
We only see a computer screen with letters, only you can see or hear your car.

 
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Can reassessing the history of 2018 Honda CIVIC Sedans with around 25000 miles be helpful? For example, how common is it for these vehicles with around 25000 miles to experience vibrations? What factors turn-out being the causes of these rare occurring vibrations?

 
Rep Power: 222

This is gibberish.

We are not going to be able to diagnose this over the internet.
Take it to a shop and have them look at it