Geological Activity Explained 5 Why most tectonic fractures are short and only a few long
Автор: Professor Agust Gudmundsson
Загружено: 2025-11-21
Просмотров: 503
Описание: This talk uses field examples of fracture systems in sedimentary rocks from the areas at and around Nash Point (on the north coast of the Bristol Channel, UK) and Kilve-Watchet (on the south coast of the Bristol Channel). In these areas there are fracture patterns of exceptional beauty and educational value. Using these field examples, I show that most tectonic fractures remain small because they become arrested at contacts between rock types with different mechanical properties or at existing fractures. Slip on a fracture during an earthquake is linearly related to the controlling dimension of the fracture. It follows that if the dimensions of the earthquake-producing fractures have power-law size distributions, then the earthquake slip and slip-surface distributions also have power-law distributions, and so will the earthquake magnitudes – as indeed they do.
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