Survey by Admiral Benham The landform was presumably named after
Admiral Andrew Ellicot Kennedy Benham (1832–1905) by
American surveyors who probably studied the geological feature. He was a
United States Navy officer, who served with both the South Atlantic and West Gulf Blockading Squadrons during the
American Civil War.
Studies following the 1990 Luzon earthquake There has been speculation in the scientific community about the nature of the landform. Following the major July 16
1990 Luzon earthquake, scientists reconsidered their fault models and decided it likely that Philippine Plateau has similarly displaced the
Philippine Fault System to the west. After analyzing older models such as that of Pinet and Stephan (1989), scientists reconsidered their fault models. They thought it highly likely that the Philippine Plateau is still displacing the
Central Luzon and the
Philippine Fault System to the west, which may have been a factor in such a catastrophic earthquake. The 20- to 50-second wave of the 1990 quake that developed a new east–west sub-fault was so strong that it terminated disastrously in the city of
Baguio in
Benguet,
Cordillera. Several scientific surveys, conducted between 2004 and 2008, collected hydrographic data that determined the morphology of the seabed in the region.
United Nations recognition of the Philippine claim Despite its proximity to the archipelago, the portion of the undersea feature beyond the 200 nautical mile Exclusive Economic Zone was previously not included in charted territory of the country. On April 8, 2009, the Republic of the Philippines lodged a partial submission with the
United Nations Commission on the Limits of the Continental Shelf to claim this portion as part of the country's extended continental shelf in relation to the continental shelf in the region of the Philippine Rise. It was submitted following the legislation of Republic Act No 9522 on March 10, 2009, which defined the country's archipelagic baselines.
Congress then enacted the bill of
Senator Miriam Defensor Santiago, now known as Republic Act No. 9522, or the Archipelagic Baselines Law, as the basis of the claim. It asserted that, according to scientific data based on seismic, magnetic, other geological features, the Philippine Rise is an extension of the Philippines’ continental shelf. After
Chinese survey ships were spotted in the region in 2017, President
Rodrigo Duterte suggested the plateau be renamed to emphasize Philippine sovereignty over the area. Soon after, the
Department of Foreign Affairs announced plans for a new name, and in May 2017, the government officially adopted the name “Philippine Rise” for the feature
Chinese research and naming of features in 2018 In January 2018, Philippine
Congressman Gary Alejano revealed how the
Department of Foreign Affairs had approved a scientific survey of the Rise by the Chinese Institute of Oceanology of the
Chinese Academy of Sciences, together with the Marine Science Institute of the
University of the Philippines. In February, Duterte‘s
Secretary of Agriculture Emmanuel Piñol told media the President had ordered the halting of all foreign research in the Philippine Rise; however, that conducted by the
Chinese Academy of Sciences was already finished two days before the order. On February 12, 2018, the
International Hydrographic Organization approved the names proposed by China for five features in the Philippine Rise, after China had submitted its findings to the organization. The names given by China were all in Chinese, namely,
Jinghao Seamount (some 70 nautical miles east of Cagayan),
Tianbao Seamount (some 70 nautical miles east of Cagayan),
Haidonquing Seamount (east at 190 nautical miles),
Cuiqiao Hill, and
Jujiu Seamount, the last two forming the central peaks of the Philippine Rise undersea geological province. The Chinese naming of the features was met public protests in the Philippines.
Malacañang Palace announced its objection and non-recognition of the Chinese names, adding it will appeal for their deletion with the International Hydrographic Organization. The government also said the Philippine embassy in Beijing will coordinate with the Chinese government on the issue. The Palace announced the following day that government intended to give Philippine names to the features of the Philippine Rise. However, a few hours later,
Presidential Spokesperson Harry Roque clarified that China’s renaming of sea features “was a scientific process and not a political one”, adding “Whoever made the discovery gets to decide what these are called.” On February 16, the Philippine government announced they have sent military personnel into the
Cagayan Valley to guard the Rise. Two days later, it was revealed that China intended to name a total of 142 features. On February 26, the Department of Foreign Affairs stated during a
Senate investigation that China actually surveyed the Rise in 2017, without any Philippine-issued permit, citing the lack of capability to detect illegal entry.
Discovery of Apolaki Caldera The world’s largest caldera, with a diameter of 150 kilometers was discovered by Jenny Anne Baretto, a Filipino marine geophysicist. It was named after Apolaki, a precolonial Tagalog solar and war deity. ==Geology==