PHYSICAL FEATURES
Volcanologists classify Hibok-Hibok as a stratovolcano and dome complex with an elevation of 1,322 meters and a base diameter of 1,000 meters.
It has six hot spring (Ardent Spring, Tangob, Bugong, Tagdo, Naasag and Kiyab), three crater lakes (Kanangkaan Crater, site of the 1948 eruption; Itum Crater, site of the 1949 eruption, and Ilihan Crater, site of the 1950 eruption). It also has a volcanic maar, Taguines Lagoon between Binone and Maac.
It's adjacent volcanic edifices are Mt. Vulcan (671 m high asl, NW og Hibok-Hibok), Mt. Mambajao (center of Camiguin), Mt. Ginsiliban (581 m high asl, southernmost Camiguin), Mt. Uhay (N of Mount Ginsiliban). There are also domes and cones at Campana Hill, Minokol Hill, Tres Marias Hill, Mt. Carling, Mt. Tibane, and Piyakong Hill.
Hibok-Hibok erupted five times in modern history. The first recorded eruption occurred in 1827. This was followed by similar activity in 1826.
In January 1871, residents of the island reported earthquakes and subterranean rumbling. There were later landslides, fissuring of land and a swarm of earthquakes. In April, the volcano spewed rocks, dust, and ashes for a week and a volcanic dome called which would later be named Mt. Vulcan began to form. The lava dome reached a height of 457 meters with a base almost 1,5000 meters after four years.
In 1897, Hibok-Hibok emitted white sulfurous vapors which damaged farms on the island. Solfataric activity continued up to 1902.
Hibok-Hibok had a pele eruption on August 1948, with a series of earth tremors. there were also landslides and earthquakes followed by dome building and nuee ardente in September 1953.
Volcanologists observed an eruption pattern during the 1948-1952 eruptions (a cycle of four phases) beginning with a short period of emission of steam from the crater and avalanches of volcanic materials, followed by 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. The third phase involves eruption of incandescent materials, emission of ash and steam in large amounts, formation of flows and occasional minor crateral outbursts and finally a decrease in steam and other ejecta from the crater.
It is one of the 22 active volcanoes in the Philippines.
1951 volcanic eruption of Mt. Hibok-Hibok:
https://www.youtube.com/watch?v=j_pTwnURbk4
HIBOK-HIBOK VOLCANO ALERT SIGNALS
ALERT LEVEL
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CRITERIA
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INTERPRETATION
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No alert
|
Background, quiet
|
No eruption in forseeable future
|
1
|
Low level seismic, fumarolic, other
unrest
|
Magmatic, tectonic or hydrothermal
disturbance; no eruption imminent
|
2
|
Low to moderate level of seismic, other
unrest with positive evidence for involvement of magma
|
Probable magmatic intrusion; could
eventually lead to an eruption
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3
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Relatively high and increasing unrest,
including numerous b-tye of earthquakes, accelerating ground deformation and
rockfalls, increased vigor of fumaroles, gas emission
|
Increasing likelihood of an eruption,
possibly within days to week.
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4
|
Intense unrest, including harmonic
tremor and/or may “long period” (low frequency) earthquakes or quiet lava
emissions and/ or dome growth and/or small eruptions
|
Magma close to or at the earth’s
surface, hazradous explosive eruption likely, possible within hours to days
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5
|
Hazardous explosive erutpion in
progress, with pyroclastic flows, surges and/or eruption column rising at
least 6 km or 20 000 feet above sea level
|
Explosive eruption in progress. Hazards
in valleys and downwind
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