Isabela Seamount Ocean Or Sea: Philippine Sea

INTERNATIONAL HYDROGRAPHIC INTERGOVERNMENTAL OCEANOGRAPHIC ORGANIZATION COMMISSION (of UNESCO)

UNDERSEA FEATURE NAME PROPOSAL (See IHO-IOC Publication B-6 and NOTE overleaf)

Note: The boxes will expand as you fill the form. Name Proposed: Isabela Seamount Ocean or Sea: Philippine Sea

Geometry that best defines the feature (Yes/No) : Point Line Polygon Multiple points Multiple lines* Multiple Combination of polygons* geometries* Yes Yes * Geometry should be clearly distinguished when providing the coordinates below. Lat. (e.g. 63°32.6’N) Long. (e.g. 046°21.3’W) 17˚47.94'N (summit) 123˚17.75'E (summit) 18˚6.5'N (bottom) 123˚22.15'E (bottom) 18˚1.38'N 123˚27.51'E 17˚57.08'N 123˚28.82'E 17˚52.6'N 123˚28.21'E 17˚49.79'N 123˚28.91'E 17˚45.93'N 123˚27.51'E Coordinates: 17˚38.73'N 123˚23.47'E 17˚32.68'N 123˚20.13'E 17˚24.16'N 123˚10.83'E 17˚26.62'N 123˚8.63'E 17˚45.23'N 123˚0.65'E 17˚55.67'N 123˚4.6'E 18˚0.82'N 123˚9.98'E 18˚6.5'N (bottom) 123˚22.15'E (bottom)

Maximum Depth: 5,170.71 m Steepness: 7˚ Feature Minimum Depth: 2,047.41 m Shape: rhombic Description: Total Relief: 3,123.30 m Dimension/Size: 78,412.52m x 52,347.62 m

Associated Features: Isabela Ridge

Shown Named on Map/Chart: Chart/Map References: Shown Unnamed on Map/Chart: Chart 4726A Within Area of Map/Chart: Chart 4726A

Reason for Choice of Name (if a Isabela is the nearest province where the seamount is located. It is the second person, state how associated with the largest province of the Philippines, and the largest on the island of Luzon in land feature to be named): area. Its capital is the city of Ilagan. The province of Isabela used to be a vast rainforest where numerous indigenous ethno-linguistic groups lived. Many of the same ethnic groups still live in the province. The name Isabela Seamount was chosen due to its proximity to the province.

Discovery Date: June 9, 2010 Discovery Facts: Discoverer (Individual, Ship): NAMRIA

Date of Survey: August 2-3, 2007; May 3-5, 2008; June 8, 2008; June 17, 2008; June 2-3, 2010; June 7-9, 2010 Survey Ship: BRP HYDROGRAPHER PRESBITERO Supporting Survey Data, including Sounding Equipement: Seabeam 2112 Track Controls: Type of Navigation: GPS with IMU Estimated Horizontal Accuracy, in 0.027 nm (50m) nautical miles (nm): Survey Track Spacing: 4.5 nm Supporting material can be submitted as Annex in analog or digital form.

Name(s): Usec. PETER N. TIANGCO, PhD Date : August 2018 E-mail : [email protected] Organization and Address: National Mapping and Resource Information Authority (NAMRIA) Lawton Avenue, Fort Andres Bonifacio, Taguig City, Philippines 1634 Proposer(s): Concurrer (name, e-mail, organization Department of Foreign Affairs (DFA), and address): Roxas Boulevard, Pasay City, Philippines 1300 [email protected]

Department of National Defense (DND), Camp Emilio Aguinaldo, Quezon City, Philippines 1110

The proposal was prepared by the Technical Working Group on Undersea Remarks: Feature Names of the Hydrography Branch of NAMRIA, in cooperation with the National Institute of Geological Sciences – University of the Philippines and Mines and Geosciences Bureau.

NOTE: This form should be forwarded, when completed:

a) If the undersea feature is located inside the external limit of the territorial sea: - to your "National Authority for Approval of Undersea Feature Names" (see Publication B-6) or, if this does not exist or is not known, either to the IHO or to the IOC (see addresses below);

b) If at least 50 % of the undersea feature is located outside the external limits of the territorial sea: - to the IHO or to the IOC, at the following addresses :

International Hydrographic Organization (IHO) Intergovernmental Oceanographic Commission (IOC) 4b, Quai Antoine 1er UNESCO B.P. 445 Place de Fontenoy MC 98011 MONACO CEDEX 75700 PARIS Principality of MONACO France Fax: +377 93 10 81 40 Fax: +33 1 45 68 58 12 E-mail: [email protected] E-mail: [email protected] Web: www.iho.int Web: http://ioc-unesco.org/

Attachments

Fig. 1. Index map showing the location of Isabela Seamount.

Depth (m)

Fig. 2. Bathymetric map of the Isabela Seamount. Contour interval is 200 meters.

Fig 3. Bathymetric map of Isabela Seamount showing track lines.

Depth (m)

Figure 4. 3D bathymetric map of the Isabela Seamount. View looking northwest.

Depth (m)

Figure 5. 3D bathymetric map of the Isabela Seamount. View looking northeast. Depth (m)

Figure 6. 3D bathymetric map of the Isabela Seamount, view looking north.

DepthDepth (m)(m)

Fig. 7. Profile of the Isabela Seamount from the south to the north edge (vertical exaggeration = 7.5)