Cryptic crossword clue
Earthquake activity exists in half of built-up area 10

The most common and most likely answer to this crossword clue is the 10 letter word SEISMICITY

I've seen this crossword clue in The Times
S
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Buddy explains!

The straight part
We know that "Earthquake/ activity" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case earthquake/ activity = seismicity.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

Crossword Answer definitions

SEISMICITY noun
  1. A measure or a degree of how seismic a region is, how prone it is to earthquakes.

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