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Answer for the clue "Earthquake activity exists in half of built-up area ", 10 letters:
seismicity

Word definitions for seismicity in dictionaries

Wiktionary Word definitions in Wiktionary
n. factor of how seismic a region is. How prone it is to earthquakes.

Usage examples of seismicity.

Information on past earthquakes must be gleaned from the geologic record and therefore, presents a picture of past seismicity that is incomplete and not yet fully deciphered.

University of Utah to dig into some textbooks on seismicity and structural geology.