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foreshock

[fawr-shok, fohr-]

noun Geology.

a relatively small earthquake that precedes a greater one by a few days or weeks and originates at or near the focus of the larger earthquake.

Origin:
1900–05; fore- + shock¹

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Foreshock is always a great word to know.

So is permeability. Does it mean:

capability of a porous rock or sediment to permit the flow of fluids through its pore spaces

seepage of water into soil or rock

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Collins

World English Dictionary

foreshock (ˈfɔːˌʃɒk)

—n
	Compare aftershock a relatively small earthquake heralding the arrival of a much larger one. Some large earthquakes are preceded by a series of foreshocks

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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foreshock

fore·shock