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The Benham Rise, officially known as Philippine Rise, is an extinct volcanic ridge located in the Philippine Sea approximately east of the northern coastline of Dinapigue, Isabela. The rise has been known to the people of
Catanduanes Catanduanes (; ), officially the Province of Catanduanes, is an island province located in the Bicol Region of Luzon in the Philippines. It is the 12th-largest island in the Philippines, and lies to the east of Camarines Sur, across Maqueda C ...
as Kalipung-awan as early as the precolonial era of the Philippines, which literally means "loneliness from an isolated place". Under the Philippine Sea lie a number of basins including the West Philippine Basin, inside of which is located the Central Basin Fault (CBF). The Philippine Plateau is located in the CBF and its basement probably is a micro-continent. - Total pages: 440 Several scientific surveys have been made on the feature to study its nature and its impact on tectonic
subduction Subduction is a geological process in which the oceanic lithosphere is recycled into the Earth's mantle at convergent boundaries. Where the oceanic lithosphere of a tectonic plate converges with the less dense lithosphere of a second plate, ...
, including one about its effects on the
1990 Luzon earthquake The 1990 Luzon earthquake struck the island of Luzon in the Philippines at 4:26 p.m. on July 16 ( PDT) or 3:26 p.m. ( PST) with an estimated moment magnitude of 7.7 and a maximum Mercalli intensity of IX (''Violent'') and produced a ...
. The Philippines claimed this feature as part of its continental shelf in a claim filed with the
United Nations The United Nations (UN) is an intergovernmental organization whose stated purposes are to maintain international peace and security, develop friendly relations among nations, achieve international cooperation, and be a centre for harmonizi ...
Commission on the Limits of the Continental Shelf on April 8, 2009, and which was approved under the
United Nations Convention on the Law of the Sea The United Nations Convention on the Law of the Sea (UNCLOS), also called the Law of the Sea Convention or the Law of the Sea Treaty, is an international agreement that establishes a legal framework for all marine and maritime activities. , 167 c ...
(UNCLOS) in 2012. The rise is designated as a "protected food supply exclusive zone" by the Philippine government since May 2017. Mining and oil exploration are banned in the Philippine Plateau as it is a protected area. On May 16, 2017, President Rodrigo Duterte signed Executive Order No. 25, renaming the feature to "Philippine Rise".


History


Survey by Admiral Benham

The landform was presumably named after Admiral Andrew Ellicot Kennedy Benham (1832–1905) by
American American(s) may refer to: * American, something of, from, or related to the United States of America, commonly known as the "United States" or "America" ** Americans, citizens and nationals of the United States of America ** American ancestry, pe ...
surveyors who were the probable discoverers of 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 The 1990 Luzon earthquake struck the island of Luzon in the Philippines at 4:26 p.m. on July 16 ( PDT) or 3:26 p.m. ( PST) with an estimated moment magnitude of 7.7 and a maximum Mercalli intensity of IX (''Violent'') and produced a ...
, scientists reconsidered their fault models and decided it likely that Philippine Plateau has similarly displaced the
Philippine Fault System The Philippine Fault System is a major inter-related system of geological faults throughout the whole of the Philippine Archipelago, primarily caused by tectonic forces compressing the Philippines into what geophysicists call the Philippine Mobi ...
to the west. After analyzing older models such as that of Pinet and Stephan (1989), scientists reconsidered their fault models. They thought that it is highly likely that the Philippine Plateau is still displacing
Central Luzon Central Luzon ( pam, (Reyun ning) Kalibudtarang Luzon, pag, (Rehiyon na) Pegley na Luzon, tgl, (Rehiyon ng) Gitnang Luzon, ilo, (Rehion/Deppaar ti) Tengnga ti Luzon), designated as Region III, is an administrative region in the Philippines, ...
and the
Philippine Fault System The Philippine Fault System is a major inter-related system of geological faults throughout the whole of the Philippine Archipelago, primarily caused by tectonic forces compressing the Philippines into what geophysicists call the Philippine Mobi ...
to the west, which may have had an impact in causing such a catastrophic earthquake. The 20-second to 50-second wave in the 1990 quake that developed a new east–west sub-fault was so strong that it terminated disastrously at the city of
Baguio Baguio ( , ), officially the City of Baguio ( ilo, Siudad ti Baguio; fil, Lungsod ng Baguio), is a 1st class highly urbanized city in the Cordillera Administrative Region, Philippines. It is known as the "Summer Capital of the Philippines" ...
in
Benguet Benguet (), officially the Province of Benguet ('';'' ; pag, Luyag/Probinsia na Benguet; ilo, Probinsia ti Benguet; ), is a landlocked province of the Philippines located in the southern tip of the Cordillera Administrative Region in the islan ...
,
Cordillera A cordillera is an extensive chain and/or network system of mountain ranges, such as those in the west coast of the Americas. The term is borrowed from Spanish, where the word comes from , a diminutive of ('rope'). The term is most commonly us ...
. 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 plateau was previously not included in the territory of the Philippines. On April 8, 2009, the Republic of the Philippines lodged a partial territorial waters claim with the United Nations Commission on the Limits of the Continental Shelf in relation to the continental shelf in the region of the Philippine Rise. It was submitted as part of petition expanding the archipelago's baselines and exclusive economic zone through a law that also included other claims involving disputed territories of the Kalayaan Islands ( Spratly Islands) and
Scarborough Shoal Scarborough Shoal, also known as Bajo de Masinloc (in Spanish), Panatag Shoal ( fil, Kulumpol ng Panatag, lit=serene cluster), Huangyan Island (Mandarin zh, c=黄岩岛, p=Huáng Yán Dǎo, l=yellow rock island), and Democracy Reef, are two ro ...
. The Congress of the Philippines enacted the bill of Senator
Miriam Defensor Santiago Miriam Palma Defensor-Santiago (''née'' Defensor; June 15, 1945 – September 29, 2016) was a Filipino scholar, academic, lawyer, judge, author, and stateswoman who served in all three branches of the Philippine government: judicial, executiv ...
, now known as Republic Act No. 9522, or the Archipelagic Baselines Law, which is 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. The claim is only a partial claim since the law that allows the Philippines to expand its territorial boundaries also includes islands in the South China Sea. The Philippines filed its claim for Benham Rise in 2008 in compliance with the requirements of the United Nations Convention on the Law of the Seas. The UN officially approved the claim in April 2012 under the administration of President
Noynoy Aquino Benigno Simeon Cojuangco Aquino III (; February 8, 1960 – June 24, 2021), also known as Noynoy Aquino and colloquially as PNoy, was a Filipino politician who served as the 15th president of the Philippines from 2010 to 2016. The son of ...
. It was the first claim of the Philippines approved by an international body since the colonial era.UN to decide on Phl claim on 13-M hectare Benham Rise
August 16, 2011, Philippine Star.
UN approves PH territorial claim to Benham Rise
April 28, 2012, Philippine Daily Inquirer.
After
Chinese Chinese can refer to: * Something related to China * Chinese people, people of Chinese nationality, citizenship, and/or ethnicity **''Zhonghua minzu'', the supra-ethnic concept of the Chinese nation ** List of ethnic groups in China, people of v ...
survey ships were spotted in the region in 2017, Philippine president Rodrigo Duterte suggested that the plateau be renamed to emphasize the Philippine's sovereignty over the area. Soon after, the Department of Foreign Affairs announced plans to come up with a new name. In May 2017, the Philippine government officially adopted the name "Philippine Rise" for the feature and designated the area as a "protected food supply exclusive zone" and prohibited mining and oil exploration in the Philippine Plateau, angering China in the process. China maintained that the Philippines has no sovereign rights or sovereignty over the Philippine Rise despite a UN-backed international ruling in 2012 that says otherwise.


Chinese research and naming of features in 2018

In January 2018, Filipino Congressman Gary Alejano revealed that the Department of Foreign Affairs had approved the Chinese Institute of Oceanology of the
Chinese Academy of Sciences The Chinese Academy of Sciences (CAS); ), known by Academia Sinica in English until the 1980s, is the national academy of the People's Republic of China for natural sciences. It has historical origins in the Academia Sinica during the Republ ...
together with the Marine Science Institute of the University of the Philippines to perform a scientific survey of the Rise. In February, Duterte's agriculture secretary told media that Duterte has now ordered the halting of all foreign researches in the Philippines Rise, however, the research being conducted by the
Chinese Academy of Sciences The Chinese Academy of Sciences (CAS); ), known by Academia Sinica in English until the 1980s, is the national academy of the People's Republic of China for natural sciences. It has historical origins in the Academia Sinica during the Republ ...
was already finished two days before the halt order. On February 12, 2018, the International Hydrographic Organization approved the names proposed by China for five features in the Philippine Rise after China submitted to the organization its research findings on the area. 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 form the central peaks of the Philippine Rise undersea geological province. The Chinese naming of the features met public protests in the Philippines. The Presidential Palace announced that it objects and it shall not recognize the Chinese names of the features and it will appeal for its rejection in the International Hydrographic Organization. The Philippine government also said that their embassy in Beijing will coordinate with the Chinese regarding the issue. A day later, the Palace announced that they intend to give Philippine names on the features of the Philippine Rise. However, a few hours later, the presidential palace clarified that it has 'no problem' with the Chinese names in the Philippine Rise. On February 16, the Philippine government announced that they have sent military personnel into Cagayan Valley to guard the Rise. Two days later, it was revealed that China intends 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 recently discovered by Jenny Anne Baretto, a Filipina marine geophysicist. It was named after Apolaki, the mythical Filipino god of the sun and war.


Geology

Philippine Rise is a submerged extinct volcanic ridge located at 16 degrees 30 minutes N, 124 degrees 45 minutes E off the coast of Luzon, with the size of about 250 km in diameter and rises over 2,000 meters (2 km.) above the sea floor, from below 5,000 meters (5 km.) below sea level to above 3,000 meters (3 km.) below sea level. Its area is close to the Philippine Seamount, located at 15 degrees 48 minutes N, 124 degrees 15 minutes E. The precise location is somewhere near the east of the
Philippine Trench The Philippine Trench (also Philippine Deep, Mindanao Trench, and Mindanao Deep) is a submarine trench to the east of the Philippines. The trench is located in the Philippine sea of the western North Pacific Ocean and continues NNW-SSE. It has ...
and near the south of the
East Luzon Trench The Philippine Trench (also Philippine Deep, Mindanao Trench, and Mindanao Deep) is a submarine trench to the east of the Philippines. The trench is located in the Philippine sea of the western North Pacific Ocean and continues NNW-SSE. It has ...
, both of which absorb the subducting force of the
Philippine Sea Plate The Philippine Sea Plate or the Philippine Plate is a tectonic plate comprising oceanic lithosphere that lies beneath the Philippine Sea, to the east of the Philippines. Most segments of the Philippines, including northern Luzon, are part ...
under the
Philippine Mobile Belt In the geology of the Philippines, the Philippine Mobile Belt is a complex portion of the tectonic boundary between the Eurasian Plate and the Philippine Sea Plate, comprising most of the country of the Philippines. It includes two subduction z ...
, a collage of large blocks of that crust that amalgamated prior to the collision of the Philippine Sea Plate with the Eurasian Plate. The origin of the landform, along with the nearby Urdaneta Plateau (a remnant of a mantle plume), is identified in one study as at least five sequences of propagating rifts, probably triggered by
mantle A mantle is a piece of clothing, a type of cloak. Several other meanings are derived from that. Mantle may refer to: *Mantle (clothing), a cloak-like garment worn mainly by women as fashionable outerwear **Mantle (vesture), an Eastern Orthodox ve ...
flowing away from the mantle thermal anomaly. Its presence of the landform disrupts the continuity of this region (known as the Philippine-East Luzon Trench) by continuously colliding with the Sierra Madre mountain range of eastern portion of the island of Luzon. Though it is generally thought that the Philippine Sea Plate is being subducted under the
Philippine Mobile Belt In the geology of the Philippines, the Philippine Mobile Belt is a complex portion of the tectonic boundary between the Eurasian Plate and the Philippine Sea Plate, comprising most of the country of the Philippines. It includes two subduction z ...
, under the rules of tectonic
subduction Subduction is a geological process in which the oceanic lithosphere is recycled into the Earth's mantle at convergent boundaries. Where the oceanic lithosphere of a tectonic plate converges with the less dense lithosphere of a second plate, ...
, there appears to be a resistance to this because of the presence of the landform, and instead, the plate is being displaced into the northern portion of Luzon to the west. The geophysical features of the plateau may have been the result of an early Miocene collision event between the Philippine Rise and the eastern margin of Luzon, which may have also allowed the inception of the NW striking strand of the Philippine fault. These forces may have impacted the shape of the island of Luzon because of the
basalt Basalt (; ) is an aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the surface of a rocky planet or moon. More than 90% of a ...
ic sea floor resisting the subduction that may have also cause the bending of the Philippine Fault., Document ID:13258 The active basins in
Central Luzon Central Luzon ( pam, (Reyun ning) Kalibudtarang Luzon, pag, (Rehiyon na) Pegley na Luzon, tgl, (Rehiyon ng) Gitnang Luzon, ilo, (Rehion/Deppaar ti) Tengnga ti Luzon), designated as Region III, is an administrative region in the Philippines, ...
, which trace an asymmetrical V shape, is the best place to observe recent tectonic evolution of the fault system. The Benham Bank is the shallowest point of the Philippine Rise.


Cultural and strategic significance

Philippine Rise has been part of the culture of ancient Filipinos. Ancient
Catanduanes Catanduanes (; ), officially the Province of Catanduanes, is an island province located in the Bicol Region of Luzon in the Philippines. It is the 12th-largest island in the Philippines, and lies to the east of Camarines Sur, across Maqueda C ...
people have fished and roamed the area long before the colonial era. In fact, it is celebrated in Catandunganons' folktales, legends and poetry. Today, large percentage of fish caught by Catandunganon comes from Philippine Rise. Its local Catandunganon term is called Kalipung-awan (means loneliness in an isolated place), as fisherfolks who catch marine life in the area for days often feel loneliness due to the area's vast waters which is seldom fished by other ethnic peoples aside from those living in Catanduanes. Its strategic location southeast of Taiwan, east of Luzon, and west of American territory of Guam make it a feature of geopolitical importance. In May 2017, the feature has been designated by the Philippines as a "protected food supply exclusive zone" prohibiting mining and oil exploration in the Philippine Plateau. To commemorate first anniversary of the Philippine government's renaming of the feature to "Philippine Rise", of the feature was declared a "Strict Protection Zone" exclusive for use for scientific research, while about of the marine area is designated as a Special Fisheries Management Area.


References


External links

{{SE Asia plates Extinct volcanoes Landforms of the Philippines Law of the sea Natural history of the Philippines Philippine Sea Philippine tectonics Plateaus of the Pacific Ocean Protected areas of the Philippines