{"id":5913,"date":"2026-03-16T17:25:46","date_gmt":"2026-03-16T09:25:46","guid":{"rendered":"https:\/\/transactions.nast.ph\/?p=5913"},"modified":"2026-03-31T07:20:46","modified_gmt":"2026-03-30T23:20:46","slug":"delineation-of-the-subic-bay-fault-zone-in-zambales-luzon-philippines","status":"publish","type":"post","link":"https:\/\/transactions.nast.ph\/?p=5913","title":{"rendered":"Delineation of the Subic Bay Fault Zone in Zambales, Luzon, Philippines"},"content":{"rendered":"\n<p class=\"has-text-align-center\">Graciano P. Yumul Jr., Carla B. Dimalanta, Decibel V. Faustino, and Joel V. De Jesus<br>National Institute of Geological Sciences<br>College of Science<br>University of the Philippines, Diliman<\/p>\n\n\n\n<p class=\"has-text-align-center\"><a href=\"http:\/\/doi.org\/10.57043\/transnastphl.1997.5913\" data-type=\"link\" data-id=\"doi.org\/10.57043\/transnastphl.1997.5913\">doi.org\/10.57043\/transnastphl.1997.5913<\/a><\/p>\n\n\n\n<p><strong>Abstract<\/strong><\/p>\n\n\n\n<p>The Zambales Ophiolite Complex (ZOC) is a well-studied exposure of upper mantle-crustal sequence in the Philippines. This ophiolite complex is subdivided into three massifs &#8211; Masinloc, Cabangan and San Antonio &#8211; which are cut by several structures. Reconnaissance gravity and magnetic surveys were conducted in the southern portion of the Zambales Ophiolite Complex to delineate gross structural features. The resulting geophysical anomalies define a major structural feature called the Subic Bay Fault Zone. This confirms the results of earlier field, petrographic and geochemical studies which suggested the presence of a structural boundary between the Cabangan Massif (which represents a mid-ocean ridge mantle suite) and the San Antonio Massif (which represents an arc crust). The results of this work do not only contribute to an understanding of how this ophiolite complex evolved but more importantly identifies a geologic structure which must be taken into consideration in any infrastructure development in this particular area.<\/p>\n\n\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\"  class=\"wp-block-file__embed\" data=\"https:\/\/transactions.nast.ph\/wp-content\/uploads\/2026\/03\/TNP-1997-19_31_Delineation-of-the-Subic-Bay-Fault-Zone-in-Zambales-Luzon-Philippines.pdf\" type=\"application\/pdf\" style=\"width:100%;height:1090px\" aria-label=\"Embed of TNP 1997 (19)_31_Delineation of the Subic Bay Fault Zone in Zambales, Luzon, Philippines.\"><\/object><a id=\"wp-block-file--media-513b5093-ecb4-4448-ad4b-bc90ff93a6e4\" href=\"https:\/\/transactions.nast.ph\/wp-content\/uploads\/2026\/03\/TNP-1997-19_31_Delineation-of-the-Subic-Bay-Fault-Zone-in-Zambales-Luzon-Philippines.pdf\">TNP 1997 (19)_31_Delineation of the Subic Bay Fault Zone in Zambales, Luzon, Philippines<\/a><a href=\"https:\/\/transactions.nast.ph\/wp-content\/uploads\/2026\/03\/TNP-1997-19_31_Delineation-of-the-Subic-Bay-Fault-Zone-in-Zambales-Luzon-Philippines.pdf\" class=\"wp-block-file__button wp-element-button\" download aria-describedby=\"wp-block-file--media-513b5093-ecb4-4448-ad4b-bc90ff93a6e4\">Download<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Graciano P. Yumul Jr., Carla B. Dimalanta, Decibel V. Faustino, and Joel V. De Jesus<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[835],"tags":[],"class_list":{"0":"post-5913","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-1997-technical-papers","7":"czr-hentry"},"_links":{"self":[{"href":"https:\/\/transactions.nast.ph\/index.php?rest_route=\/wp\/v2\/posts\/5913"}],"collection":[{"href":"https:\/\/transactions.nast.ph\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/transactions.nast.ph\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/transactions.nast.ph\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/transactions.nast.ph\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5913"}],"version-history":[{"count":3,"href":"https:\/\/transactions.nast.ph\/index.php?rest_route=\/wp\/v2\/posts\/5913\/revisions"}],"predecessor-version":[{"id":6277,"href":"https:\/\/transactions.nast.ph\/index.php?rest_route=\/wp\/v2\/posts\/5913\/revisions\/6277"}],"wp:attachment":[{"href":"https:\/\/transactions.nast.ph\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5913"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/transactions.nast.ph\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5913"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/transactions.nast.ph\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5913"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}