Nature and tectonic significance of fault zone weakening page 344 r e holdsworth ra strachan j magloughlin and r j knipe eds geological society london special publication no 186 xxx 32 pp 2001 101 bob holdsworth of the university of durham has made something of a cottage industry in organizing symposia on various fault . Geological society london special publications 186 under the long term loading conditions typical of geological fault zones poorly understood phenomena such as subcritical crack growth in . The nature and tectonic significance of fault zone weakening geological society special publication band 186 r e holdsworth r a strachan j magloughlin r . Abstract many faults appears to form persistent zones of weakness that fundamentally influence the distribution arichitecture and movement patterns of crustal. The nature and tectonic significance of fault zone weakening burlington house london march 2000 s ome fault zones develop into persistent zones of weakness that influence the fundamental architectures and kinematics of perhaps oceanic and certainly continental crust the topic of weak faults was the focus of a research meeting organised jointly by the structural geology and tectonics