![\"\"](\"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/wp-content\/uploads\/sites\/35\/2023\/12\/Image_143-300x208.jpg\")
<\/p>\r\n\r\na) Mohr circle number 1 intercepts the shear failure envelope. Thus, under this stress condition, shear fractures will be formed. The image below shows drawings of the faults that are formed under the stress conditions represented in the Mohr diagram and table to their right. The Mohr circle shows only the stress magnitude and, in this case, is related to the formation of shear fractures (faults); the fault orientation (strike and dip) depends on the tectonic regime and on the stress orientation as specified in the table.<\/p>\r\n
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b) Mohr circle number 2 intercepts the failure envelope at point T (i.e., it means that \u03c3<\/span><\/em>3<\/span><\/sub> = T<\/span>); thus, extension fractures (joints) will be formed. The image below shows drawings of the joints that are formed under the stress condition represented in the Mohr diagram and table shown below the drawings. The Mohr circle shows only the stress magnitude that, in this case, is related to the formation of extension fractures (joints). The joint orientation (strike and dip) depends on the tectonic regime and on the stress orientation as specified in the table.<\/p>\r\n In both extensional and strike-slip regimes, joints are vertical. One can distinguish between the two regimes when plumes are present on the joint surface. The axis of the plume is parallel to \u03c3<\/span><\/em>1<\/span><\/sub> (as shown in Figure 33<\/a> and in the image presented in the solution of Exercise 8<\/a>). Consequently, when the plume axis is horizontal, the tectonic regime is of the strike-slip type and when the axis is vertical, the regime is extensional (examples are shown in the photographs of Exercises 8<\/a>, 9<\/a> and 11<\/a>).<\/p>\r\n Click to return to where text linked to Exercise 6<\/strong><\/span><\/a><\/p>\r\n Return to Exercise 6<\/strong><\/span><\/a><\/p>","rendered":" a) Mohr circle number 1 intercepts the shear failure envelope. Thus, under this stress condition, shear fractures will be formed. The image below shows drawings of the faults that are formed under the stress conditions represented in the Mohr diagram and table to their right. The Mohr circle shows only the stress magnitude and, in this case, is related to the formation of shear fractures (faults); the fault orientation (strike and dip) depends on the tectonic regime and on the stress orientation as specified in the table.<\/p>\n b) Mohr circle number 2 intercepts the failure envelope at point T (i.e., it means that \u03c3<\/span><\/em>3<\/span><\/sub> = T<\/span>); thus, extension fractures (joints) will be formed. The image below shows drawings of the joints that are formed under the stress condition represented in the Mohr diagram and table shown below the drawings. The Mohr circle shows only the stress magnitude that, in this case, is related to the formation of extension fractures (joints). The joint orientation (strike and dip) depends on the tectonic regime and on the stress orientation as specified in the table.<\/p>\n In both extensional and strike-slip regimes, joints are vertical. One can distinguish between the two regimes when plumes are present on the joint surface. The axis of the plume is parallel to \u03c3<\/span><\/em>1<\/span><\/sub> (as shown in Figure 33<\/a> and in the image presented in the solution of Exercise 8<\/a>). Consequently, when the plume axis is horizontal, the tectonic regime is of the strike-slip type and when the axis is vertical, the regime is extensional (examples are shown in the photographs of Exercises 8<\/a>, 9<\/a> and 11<\/a>).<\/p>\n Click to return to where text linked to Exercise 6<\/strong><\/span><\/a><\/p>\n![\"\"](\"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/wp-content\/uploads\/sites\/35\/2023\/12\/Image_144-300x147.jpg\")
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