features characteristic of active fault zones present along the fault trace; by physical ground water barriers in geologically young deposits; by stratigraphic displacement of quaternary deposits by faulting; by offset streams. Seismologically, earthquake epicentres are associated with individual faults with a high degree of confidence. (ii) Potentially active faults - There is no reliable report of historic surface faulting; faults which may be found in older alluvial deposits but are not known to cut or displace the most recent alluvial deposits; geomorphic features characteristic of active fault zones are subdued, eroded and discontinuous; water barriers may be present in older materials, Seismologically, there is alignment of some earthquake foci along the fault trace but loca- tions are assigned with a low degree of confidence, (iii) Faults of uncertain activity - This category is used if the available information is insuf- ficient to comply with criteria which would establish fault activity. If the fault is considered critical to the sites, additional studies are necessary to establish its category. 16 (iv) Inactive faults - A thorough study of local sources of historical information has not given evidence of any activity. Geologically, features characteristic of active fault zones are not present and no geological evidence has been found to indicate that the fault has moved in the recent past and has been recognized as a source of earthquakes. 6 .1.4 Fault recognition Criteria for recognizing an active fault may be summarized under geological, seismological and historical headings as follows: (i) Geological criteria - An active fault is indicated by young geomorphic features such as: - fault scarps - triangular facets - fault rift - pressure ridges - offset streams - enclosed depressions - fault valleys - rejuvenated streams - folding or warping of young deposits - ground water barriers in recent alluvium 
**Analysis**
The text appears to be discussing the classification of faults in a geological context, with a focus on identifying active faults and determining their potential impact on the surrounding area. The criteria mentioned include geological, seismological, and historical indicators of fault activity. This suggests that the text is related to the field of geology and may be relevant to the management of natural resources and the environment.

**Category**
Natural resources and environment, Science and technology