publication . Article . 2013

Constraining fault friction by re-examining earthquake nodal plane dips

Timothy A. Middleton; Alex Copley;
Open Access English
  • Published: 13 Nov 2013
  • Publisher: Royal Astronomical Society
We have assembled a catalogue of well-constrained focal mechanisms for earthquakes that occurred on continental dip-slip faults that have experienced only small displacements during their current phase of activity. Nodal planes for both reverse- and normal-faulting events are seen to vary between ∼30° and ∼60°, and are concentrated towards the centre of this range. The observed distributions suggest the reactivation of structures with a low coefficient of friction (less than ∼0.3, and possibly as low as ≤0.1). We propose that this low coefficient of friction corresponds to the presence of weak materials in pre-existing fault zones.
Medical Subject Headings: human activities
free text keywords: sub-02, sub-06, Geochemistry and Petrology, Geophysics, Coefficient of friction, Fault friction, Seismology, Geology, Fault (geology), geography.geographical_feature_category, geography
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