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NAME OF VOLCANO:                                    HIBOK-HIBOK
LOCATION:                                                      Camiguin Island, located at the northwestern end of the Island
                                                                           (9°12.2'N, 124°40.5’E)


Elevation: 1.332 km
Base Diameter: 10 km
Type of Volcano: Stratovolcano and dome complex
Hotsprings: Ardent Spring, Tangob, Bugong, Tagdo, Naasag, Kiyab
Crater Lakes/Maars:
CRATERS: Kanangkaan Crater (site of 1948 eruption)

Itum Crater (site of 1949 eruption)
Ilihan Crater (site of 1950 eruption)
MAAR: Taguines Lagoon (located between Binone and Maac)

Adjacent Volcanic Edifice: Mt. Vulcan ( 671 m high asl, NW of Hibok-Hibok ), Mt. Mambajao (center of Camiguin), Mt. Ginsiliban (581 m high asl, southernmost Camiguin), Mt. Uhay (N of Mount Ginsiliban); Domes and cones: Campana Hill, Minokol Hill, Tres Marias Hill, Mt. Carling, Mt. Tibane, Piyakong Hill


Rock Type: Hornblende andesite and dacite
Tectonic Setting: Central Mindanao Arc


Number of Historical Eruptions: 5
Latest Eruption/Activity: 1948 Sept. 31 - 1953 July
Eruption Type:

1. Pelean (e.g. 1948-1952)
2. Dome building with nuee ardente (e.g. 1871, 1949-1953)
3. Solfataric activity with subterranean sounds ( e.g. 1897-1902)

Eruption Sites during the 1948-1952 eruptions: Kanangkaan Crater (1948), Itum Crater (1949) and c) Ilihan Crater (1950).

Eruption Pattern observed during the 1948-1952 eruptions (a cycle of four phases):

1. A short period of emission of considerable amount of steam from the crater and avalanches of volcanic materials;
2. Explosions or steam blast with emission of heavy clouds of steam, ash and other fragmentary volcanic materials with a strong possibility of the development of nuee ardente;
3. Eruption of incandescent meterials, emission of ash and steam in large amounts, formation of flows and occasional minor crateral outburst, and
4. Decrease in amount of steam and other ejecta from the crater.

Precursors to Eruptions:

1. Increasing number of volcanic quakes/tremors
2. Localized landslides, rockfalls and landslides from the summit area not attributable to heavy rains
3. Appreciable increase in steam emission
4. Progressive ground deformation (tilting, inlfation, etc.
5. Presence of crater glow
6. Appearance of solfataras


Type of Hazards: Steam blasts, Glowing avalanches, Lava flows, Lahars
Permanent Danger Zone: Three (3) km radius from the summit
Other Buffer Zones:

POTENTIALLY DANGEROUS AREA: Camiguin Island and north of line connecting Tangaro, Catarman and Tupsan (all in Mambajao)


Volcano Observatory: Quiboro Volcano Observatory, Mambajao, 4.7 km NE of Hibok-Hibok (, 9° 14.0'N, 124° 40.3'E)
Monitoring Methods:

1. Seismic (number of recorded volcanic quakes and tremors)
2. Ground deformation – Electronic Distance Measurement (EDM)
3. Visual observations (steaming activity, and other phenomena)

Monitoring Stations

A - Seismic Network
· Hibok-Hibok Observatory
· Upper Southeast Slope
· Napo, Catarman
· Vulcan Peak Observation Point
· Vulcan Peak Repeater Station
· Lawigan, Catarman
· Mainit, Catarman Observation Point
· Baylao
B - Ground Deformation
· PRECISE LEVELING LINE - Quiboro to Hibok-Hibok slope