Dictionary of Geotourism

2020 Edition
| Editors: Anze Chen, Young Ng, Erkuang Zhang, Mingzhong Tian

Stria

Reference work entry
DOI: https://doi.org/10.1007/978-981-13-2538-0_2355

Synonym: Striation; Scratch

When two rock blocks slide past each other, scratches are left on the fracture walls due to the abrasion of breccia or clastic rock. These scratches can be used to determine the direction of relative movement of the blocks. In general, the scratches are deep and wide at one end but narrow and shallow at the other. When the rock particle sizes are the same on both walls, the movement direction of the opposite wall is from the wide and deep end towards the shallow and narrow end. When the scratch along the movement direction is touched, there is a feeling of exceptional smoothness. Sometimes, the scratches indicate more than one slip direction on the same surface. Upon detailed inspection, they are in different directions, indicating that there have been several sliding movements. Scratches can be formed by glacial action, flooding or landslides; hence, not all scratches are fault-related scratches. Careful identification is necessary. A comprehensive...

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© Springer Nature Singapore Pte Ltd. 2020