Taal Volcano

Taal Volcano
Taal volcano aerial.jpg
Aerial photo of Taal Volcano; North is on right-hand side of photo.
Elevation 400 metres (1,312 ft)
Location Talisay and San Nicolas, Batangas, Luzon, Philippines
Type Stratovolcano
Last eruption 1977
Map showing major volcanoes of the Philippines

Taal Volcano is a stratovolcano on the island of Luzon in the Philippines. It is situated between the towns of Talisay and San Nicolas in Batangas. It consists of an island in Lake Taal, which is situated within a caldera formed by an earlier, very powerful eruption. It is located about 50 km (31 Miles) from the capital, Manila. It is one of the active volcanoes in the Philippines, all part of the Pacific ring of fire.

The volcano has erupted violently several times, causing loss of life in the populated areas surrounding the lake, the current death toll standing at around 5,000 - 6,000. Because of its proximity to populated areas and eruptive history, the volcano has been designated a Decade Volcano worthy of close study to prevent future natural disasters. It was thought to be named as "a volcano inside a volcano" because many believed that the lake that circles the volcano was once a crater or mouth of a volcano.

Contents

Geological history

Taal Volcano is part of a chain of volcanoes along the western side of the island of Luzon, which were formed by the subduction of the Eurasian Plate underneath the Philippine Mobile Belt. Taal Lake lies within a 25-30 km caldera formed by four explosive eruptions between 500,000 and 100,000 years ago. Each of these eruptions created extensive ignimbrite deposits, reaching as far away as where Manila stands today.

Since the formation of the caldera, subsequent eruptions have created another volcanic island, within the caldera, known as Volcano Island. This island covers an area of about 23 km², and consists of overlapping cones and craters. 47 different cones and craters have been identified on the island.

Crater Lake & Vulcan Point

Volcano Island contains a lake about 2 km across, called Crater Lake. Within Crater Lake is another small volcanic island, called Vulcan Point. Vulcan Point is the world's largest volcanic island within a lake on an island within a lake on an island.[1]

Recent activity

There have been 33 recorded eruptions at Taal since 1572. One of the more devastating eruptions occurred in 1911, which claimed more than a thousand lives. The deposits of that eruption consisted of a yellowish, fairly decomposed (non-juvenile) tephra with a high sulfur content.

The most recent period of activity lasted from 1965 to 1977, and was characterized by the interaction of magma with the lake water, which produced violent phreatic explosions. In particular, the 1965 eruption led to the recognition of base surge[2] as a process in volcanic eruption (due to the fact that one of the American geologists, who visited the volcano shortly after the 1965 eruption, had witnessed an atomic bomb explosion when he was a soldier). The eruption generated base surges and cold pyroclastic flows, which traveled several kilometers across Lake Taal, devastating villages on the lake shore and, killing about a hundred people. The population of the island was evacuated only after the onset of the eruption. Precursory signs were not interpreted correctly until after the eruption. Eruptions in 1968 and 1969 were characterized partly by Strombolian activity and produced a massive lava flow that reached the shore of lake Taal. The 1977 eruption merely produced a small cinder cone within the main crater.

Current activity

Although the volcano has been quiet since 1977, it has shown signs of unrest since 1991, with strong seismic activity and ground fracturing events, as well as the formation of small mud pots and mud geysers on parts of the island.

The Philippine Institute of Volcanology and Seismology (Phivolcs) regularly issues notices and warnings about current activity at Taal, including ongoing seismic unrest.

For instance a notice on 28 August 2008, notified "the public and concerned authorities" that the "Taal seismic network recorded ten (10) volcanic earthquakes from 5:30 A.M. to 3:00 P.M. today. Two (2) of these quakes that occurred at 12:33 and 12:46 P.M. were both felt at intensity II by residents at barangay Pira-piraso. These quakes were accompanied by rumbling sounds. The events were located northeast of the volcano island near Daang Kastila area with depths of approximately 0.6km (12:33 P.M.) and 0.8km (12:46 P.M.)" [3]

Eruption precursors at Taal

In light of its proximity to populated areas and violent eruptive history, Taal has been designated one of sixteen Decade Volcanoes, making it a focus for research efforts and disaster mitigation plans. While seismic activity is a common precursor to eruptive activity, another useful indicator at Taal is the temperature of Lake Taal. Before the 1965 eruption began, the lake's temperature rose to several degrees above normal. However, the lake's temperature does not always rise before an eruption. Before some eruptions, the dissolution of acidic volcanic gases into the lake has resulted in the death of large numbers of fish.

Earthquake precursors in the Taal region

An interesting observation on Volcano Island was made in 1994. Volcanologists measuring the concentration of radon gas in the soil on the island measured an anomalous increase of the radon concentration by a factor of six in October 1994. This increase was followed 22 days later by a magnitude 7.1 earthquake on November 15, centred about 50 km south of Taal, off the coast of Luzon.

A typhoon had passed through the area a few days before the radon spike was measured, but when Typhoon Angela, one of the most powerful to strike the area in ten years, crossed Luzon on almost the same track a year later, no radon spike was measured. Therefore, typhoons were ruled out as the cause, and there is strong evidence that the radon originated in the stress accumulation preceding the earthquake.

Images


See also

Notes

  1. ↑ [http://www.elbruz.org/islands/Islands%20and%20Lakes.htm The Island and Lake Combination
  2. ↑ http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html#Base%20surge: Turbulent, low-density cloud of rock debris and water and (or) steam that moves over the ground surface at high speed. Base surges are generated by explosions. (Miller, 1989)
  3. ↑ [1]

References

External links

Decade Volcanoes
Avachinsky · Colima · Etna · Galeras · Koryaksky · Loa · Merapi · Nyiragongo · Rainier · Sakurajima · Santamaría · Taal · Teide · Ulawun · Unzen · Vesuvius