Termination of a Major Normal Fault

From Open Energy Information

Termination of a Major Normal Fault:
Major normal fault terminations or tip-lines sometimes split into multiple closely-spaced faults that result in increased permeability. Fault sets at these terminations sometimes appear as "horsetailing" splays that facilitate hydrothermal fluid migration in the subsurface.
Other definitions:Wikipedia Reegle

Terminations of major normal faults, whereby faults break up into multiple splays or horsetail. Illustration by James E. Faulds.[1]

Faulds uses this term as a structural control found in the Basin and Range province of the US.

Major normal faults sometimes terminate into multiple horsetailing splays that result in increased hydrothermal fluid flux. As of 2011, 22% of all known Basin & Range structures hosting geothermal systems occur at normal fault terminations or tip-lines with multiple closely-spaced faults that enhance permeability.[1]


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  1. 1.0 1.1 James E. Faulds,Nicholas H. Hinz,Mark F. Coolbaugh,Patricia H. Cashman,Christopher Kratt,Gregory Dering,Joel Edwards,Brett Mayhew,Holly McLachlan. 2011. Assessment of Favorable Structural Settings of Geothermal Systems in the Great Basin, Western USA. In: Transactions. GRC Anual Meeting; 2011/10/23; San Diego, CA. Davis, CA: Geothermal Resources Council; p. 777–783