{"id":1682,"date":"2023-12-07T21:43:42","date_gmt":"2023-12-07T21:43:42","guid":{"rendered":"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/?post_type=chapter&#038;p=1682"},"modified":"2023-12-11T15:47:05","modified_gmt":"2023-12-11T15:47:05","slug":"solution-exercise-10","status":"publish","type":"chapter","link":"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/chapter\/solution-exercise-10\/","title":{"raw":"Solution Exercise 10\u200c\u200c","rendered":"Solution Exercise 10\u200c\u200c"},"content":{"raw":"The N62E\/74SE fracture bears a plume which indicates that it propagated through the opening mode; therefore, the fracture is a joint (extension fracture) and <span class=\"s23\"><em><span class=\"s23\">\u03c3<\/span><\/em><\/span><sub><span class=\"s31\">3<\/span><\/sub> is perpendicular to it, close to horizontal and striking at around N30W. <a href=\"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/chapter\/exercise-8\/\">Exercise 8<\/a> shows that <span class=\"s23\"><em><span class=\"s23\">\u03c3<\/span><\/em><\/span><sub><span class=\"s31\">1<\/span><\/sub> is parallel to the axis of a plume, so <span class=\"s23\"><em><span class=\"s23\">\u03c3<\/span><\/em><\/span><sub><span class=\"s31\">1<\/span><\/sub> should approach vertical. This implies that the tectonic regime is extensional (<span class=\"s23\"><em><span class=\"s23\">\u03c3<\/span><\/em><\/span><sub><span class=\"s31\">1<\/span><\/sub> is vertical and <span class=\"s23\"><em><span class=\"s23\">\u03c3<\/span><\/em><\/span><sub><span class=\"s31\">3<\/span><\/sub> is horizontal). However, the typical dip of joints of the Andersonian extensional regime is vertical. Thus, assuming that <span class=\"s23\"><em><span class=\"s23\">\u03c3<\/span><\/em><\/span><sub><span class=\"s31\">1<\/span><\/sub> is vertical, the fracture makes an angle of ~15\u00b0 with this stress. This implies that it is a hybrid fracture, formed by both opening and shear modes.\r\n\r\n&nbsp;\r\n<p style=\"text-align: right;\"><a href=\"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/chapter\/3-7-highlights-on-tectonic-regimes-and-groundwater-flow-with-opportunities-to-exercise-knowledge-gained-by-reading-sections-1-2-and-3\/#exercise-8\"><span style=\"text-decoration: underline;\"><strong>Click to return to where text linked to Exercise 10<\/strong><\/span><\/a><\/p>\r\n<p style=\"text-align: right;\"><a href=\"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/chapter\/exercise-10\/\"><span style=\"text-decoration: underline;\"><strong>Return to Exercise 10<\/strong><\/span><\/a><\/p>","rendered":"<p>The N62E\/74SE fracture bears a plume which indicates that it propagated through the opening mode; therefore, the fracture is a joint (extension fracture) and <span class=\"s23\"><em><span class=\"s23\">\u03c3<\/span><\/em><\/span><sub><span class=\"s31\">3<\/span><\/sub> is perpendicular to it, close to horizontal and striking at around N30W. <a href=\"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/chapter\/exercise-8\/\">Exercise 8<\/a> shows that <span class=\"s23\"><em><span class=\"s23\">\u03c3<\/span><\/em><\/span><sub><span class=\"s31\">1<\/span><\/sub> is parallel to the axis of a plume, so <span class=\"s23\"><em><span class=\"s23\">\u03c3<\/span><\/em><\/span><sub><span class=\"s31\">1<\/span><\/sub> should approach vertical. This implies that the tectonic regime is extensional (<span class=\"s23\"><em><span class=\"s23\">\u03c3<\/span><\/em><\/span><sub><span class=\"s31\">1<\/span><\/sub> is vertical and <span class=\"s23\"><em><span class=\"s23\">\u03c3<\/span><\/em><\/span><sub><span class=\"s31\">3<\/span><\/sub> is horizontal). However, the typical dip of joints of the Andersonian extensional regime is vertical. Thus, assuming that <span class=\"s23\"><em><span class=\"s23\">\u03c3<\/span><\/em><\/span><sub><span class=\"s31\">1<\/span><\/sub> is vertical, the fracture makes an angle of ~15\u00b0 with this stress. This implies that it is a hybrid fracture, formed by both opening and shear modes.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: right;\"><a href=\"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/chapter\/3-7-highlights-on-tectonic-regimes-and-groundwater-flow-with-opportunities-to-exercise-knowledge-gained-by-reading-sections-1-2-and-3\/#exercise-8\"><span style=\"text-decoration: underline;\"><strong>Click to return to where text linked to Exercise 10<\/strong><\/span><\/a><\/p>\n<p style=\"text-align: right;\"><a href=\"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/chapter\/exercise-10\/\"><span style=\"text-decoration: underline;\"><strong>Return to Exercise 10<\/strong><\/span><\/a><\/p>\n","protected":false},"author":6,"menu_order":10,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-1682","chapter","type-chapter","status-publish","hentry"],"part":1650,"_links":{"self":[{"href":"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/wp-json\/pressbooks\/v2\/chapters\/1682","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/wp-json\/wp\/v2\/users\/6"}],"version-history":[{"count":5,"href":"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/wp-json\/pressbooks\/v2\/chapters\/1682\/revisions"}],"predecessor-version":[{"id":2117,"href":"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/wp-json\/pressbooks\/v2\/chapters\/1682\/revisions\/2117"}],"part":[{"href":"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/wp-json\/pressbooks\/v2\/parts\/1650"}],"metadata":[{"href":"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/wp-json\/pressbooks\/v2\/chapters\/1682\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/wp-json\/wp\/v2\/media?parent=1682"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/wp-json\/pressbooks\/v2\/chapter-type?post=1682"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/wp-json\/wp\/v2\/contributor?post=1682"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/books.gw-project.org\/structural-geology-applied-to-fractured-aquifer-characterization\/wp-json\/wp\/v2\/license?post=1682"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}