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Mount Pelée

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Mount Pelée (pronounced ; French: Montagne Pelée "Bald Mountain") is an active volcano on the northern tip of the French overseas department of Martinique in the Lesser Antilles island arc of the Caribbean. It is among the deadliest stratovolcanoes on Earth; its volcanic cone composed of layers of volcanic ash and hardened lava.

The volcano is now famous for its extremely destructive eruption in 1902 and the destruction that resulted, now dubbed the worst volcanic disaster of the 20th century. The eruption killed about 30,121 people, most deaths in the destroyed Saint-Pierre, at that time the largest city in Martinique, due to its deadly pyroclastic flows. Pyroclastic flows completely destroyed St. Pierre, Martinique, a town of 30,000 people, following the eruption of Mont Pelée in 1902. The eruption left only two survivors in the direct path of the volcano, one alive because he was in a poorly ventilated, dungeon-like jail cell and the other, living on the edge of the city, escaped with severe burns. Mount Pelée is made up mostly of pyroclastic material. The event marked the only major volcanic disaster in the history of France and its overseas territories.

Geographical setting

The volcano lies within the Lesser Antilles, an island arc within the Caribbean Sea. The volcano is very big, it measures 4583 feet in elevation. Its most recent eruption took place from 1929 to 1932. St. Pierre is the closest city to Mt. Pelée.

Geography

Mount Pelée itself is the result of a typical island arc, a curved chain of volcanoes approximately 850 kilometers in length, between Puerto Rico and Venezuela, where the Caribbean Plate meets Atlantic Oceanic crust belonging to the South American Plate. The South American Plate slips under the Caribbean Plate at intervals from 1 centimeter to 2 centimeters per year, and dips into the mantle. Partial fusion of the plate along with sediments forms the magma feeding the volcanoes of the Lesser Antilles. This process is also responsible for the seismicity of that region.

Other volcanoes in the region are also known for their volcanic activity, including Saint Vincent's La Soufrière, Guadeloupe's Soufriere volcano, Montserrat's Soufrière Hills, and the submarine volcano Kick-'em-Jenny.

Volcanologists have identified three different phases in the evolution of mount Pelée volcano: initial, intermediate, and modern. In an initial phase, called the "Paléo-Pelée" stage, Mount Pelee was a common stratovolcano. The cone of Paléo-Pelée is composed of many layers of lava flows and fragmented volcanic debris. Remains of the Paléo-Pelée cone are still visible at the northern view at the volcano today.

A second stage, now called the intermediate phase, started around 100,000 years ago, after a long period of quiescence. This stage is grouped by the formation of the Morne Macouba lava dome, then later on, the Morne Macouba caldera. During the intermediate phase, there were several eruptions which produced pyroclastic flows like those that destroyed Saint-Pierre in the 1902 eruption. Around 25,000 years ago, a large Southwest sector collapse occurred, forming a landslide. This event is similar to the eruption of Mount Saint Helens in 1980.

The modern stage of the evolution of Mount Pelée has created most of the current cone, with deposits of pumice and the results of past pyroclastic flows. More than 30 eruptions have been identified during the last 5,000 years of the volcano's activity.

3,000 years ago, following a large pumice eruption, the Étang Sec (FRENCH: Dry Pond) caldera was then formed. The 1902 eruption took place within the Étang Sec crater. This eruption formed many pyroclastic flows and produced a dome which filled the caldera.

The following eruption in 1929 formed a second dome in the Étang Sec caldera, and produced pyroclastic flows emptying into the Blanche River valley. This last eruption is mainly responsible for the current state of Mount Pelée.

1902 eruption

Before the tragic 1902 eruption, as early as the summer of 1900, signs of increased fumarole activity were present in the Étang Sec crater near the summit. Relatively minor phreatic (steam) eruptions that occurred in 1792 and 1851 were evidence that the volcano was active and potentially dangerous. Local natives, the Carib people, knew it as "fire mountain" from previous eruptions in ancient times.

Mount Pelée began its eruptions on April 23, 1902. In early April, excursionists noted the appearance of sulfurous vapors emitting from fumaroles near the mountaintop. This was not regarded as important, as fumaroles had been appearing and disappearing in the past.

On April 23, the mountain caused a light rain of cinders on its southern and western side, together with sharp underground shocks.

On April 25, the mountain emitted a large cloud containing rocks and ashes from its top, where the Étang Sec—a dry basin—was located. The ejected material did not cause a meaningful amount of damage.

On April 26, the area was dusted by volcanic ash from a next eruption; the public authorities still did not see a reason to worry.

On April 27, several excursionists climbed the mountaintop to find Étang Sec filled with water, forming a lake 180 m (590 ft) across. There was a 15 m (50 ft) high cone of volcanic debris built up on one side, feeding the lake with a steady stream of boiling water. Sounds resembling a cauldron with boiling water were heard from deep underground. The strong smell of sulfur was all over the city, 6.4 km (4.0 mi) away from the volcano, causing discomfort to people and horses.

On April 30, the rivers Roxelane and Rivière des Pères swelled, carrying boulders and trees from the mountaintop. The villages of Prêcheur and Sainte-Philomène were receiving a steady stream of ash.

At 11:30 p.m. on May 2, the mountain produced loud explosions, earthquakes, and a massive pillar of dense black smoke. Ashes and fine-grained pumice covered the entire northern half of the island. The detonation continued in 5-6 hour intervals. This led the local newspaper Les Colonies to indefinitely postpone the proposed picnic on the mountain, originally planned for May 4. Farm animals started dying from hunger and thirst, as their sources of water and food were contaminated with ash.

On Saturday, May 3, the wind blew the ash cloud northwards, alleviating the situation in Saint-Pierre. The next day the ash fall intensified, and the communication between Saint-Pierre and the Prêcheur district was severed. The ash cloud was so dense that the coastal boats feared to navigate through it. Many citizens decided to evacuate, filling the capacity of the steamer lines. The area was covered with a layer of fine, flour-like white ash. The animals, wild and domestic alike, were growing restless; the Guérin Sugar Works, 3 kilometres (1.9 mi) northwest of Saint-Pierre, was invaded by a great swarm of speckled ants and 1 foot (30 cm)-long centipedes, which bit unfortunate horses while workers tried to subdue the frenzied insects. In Saint-Pierre, hundreds of restless fer-de-lance snakes slithered through the streets, biting anybody who did not stay out of their paths. Soldiers were called in to shoot the snakes, although not before a number of humans and domestic animals were killed by the snakes.

On Monday, May 5, the mountain apparently calmed down somewhat; however, at about 1 PM, the sea suddenly receded about 100 metres (330 ft) and then rushed back, flooding parts of the city, and a large cloud of smoke appeared westwards of the mountain. One wall of the Étang Sec crater collapsed and propelled a mass of boiling water and mud, or lahar, into Blanche River, flooding the Guérin sugar works and burying about 150 victims under 60 metres (200 ft) to 90 metres (300 ft) of mud. Refugees from other areas rushed into Saint-Pierre. That night, the atmospheric disturbances disabled the electric grid, sinking the city into darkness and adding to the confusion.

The next day, at about 2 AM, loud sounds were heard from within the depth of the mountain.

On Wednesday, May 7, at around 4 AM, the mountain stepped up its activity; the clouds of ash caused numerous bolts of volcanic lightning around the mountaintop, and both the craters glowed reddish orange into the night. Through the day, people were leaving the city, but more people from the countryside were attempting to find refuge in the city, increasing its population by several thousand. The newspapers still claimed the city was safe. News of the volcano Soufrière erupting on the nearby Saint Vincent island reassured the people that the internal pressures in the mountain were being relieved. Not everyone was reassured, though; Captain Marina Leboffe, of the barque Orsolina, left the harbor with only half of the sugar cargo loaded, despite shippers' protests, clearance refused by the port authorities, and threats of being arrested, as were many other civilians refused exit of the town. However, Governor Louis Mouttet and his lady stayed in the city. By the evening, the mountain's tremors seemed to calm down again.

The main eruption

On May 8, 1902, on Ascension Day, a volcanic eruption destroyed the town of Saint-Pierre, about 6.4 kilometres (4.0 mi) south of the summit.

In the morning, people were observing the fireworks the mountain was displaying. The night shift telegraph operator was sending the reports of the volcano's activity, to the operator at Fort-de-France, claiming no significant new developments; his last transmission was "Allez", handing over the line to the remote operator. It was 7:52; the next second, the telegraph line went dead. A cable repair ship had the city in direct view; the upper mountainside ripped open and a dense black cloud shot out horizontally. A second black cloud rolled upwards, forming a gigantic mushroom cloud and darkening the sky in a 50-mile (80 km) radius. The initial speed of both clouds was later calculated to be over 670 kilometres (420 mi) per hour.

The horizontal pyroclastic cloud hugged the ground and sped down towards the city of Saint-Pierre, appearing black and heavy, glowing hot from the inside. It consisted of superheated steam and volcanic gases and dust, with temperatures exceeding 1075 °C. In under a minute it reached and covered the entire city, instantly igniting everything flammable with which it came in contact.

A rush of wind followed, this time towards the mountain. Then came a half-hour downpour of muddy rain mixed with ashes. For the next several hours, all communication with the city was severed. Nobody knew what was happening, nor who had authority over the island, as the governor was unreachable and his status unknown. Some survivors were picked from the sea, mostly badly burned sailors who had been blown into the sea by the blast and then clung for hours to floating debris.

There are unnamed eyewitnesses to the eruption, probably survivors on the boats at the time of the eruption. One eyewitness said "the mountain was blown to pieces, there was no warning", while another said "it was like a giant oil refinery". One person even went as far to say that "the town vanished before our eyes."

A warship approached the shore at about 12:30, but the intense heat prevented it from landing until about 3 PM. The city burned for several more days.

The area devastated by the pyroclastic cloud covered about 8 square miles (21 km2), with the city of Saint-Pierre taking its brunt.

At the time of the eruption, Saint-Pierre had a population of about 28,000, which had swollen with refugees from the minor explosions and mud flows first emitted by the volcano. Legend has previously reported that out of the 30,000, there were only two survivors: Louis-Auguste Cyparis, a felon held in an underground cell in the town's jail for wounding a friend with a cutlass, and Léon Compère-Léandre, a man who lived at the edge of the city. . In reality , there were a number of survivors that made their way out of the fringes of the blast zone. Many of these survivors were horribly burned and some died later from their injuries. A number made their way to LeCarbet just south of St. Pierre behind a ridge that protected that town from the worst of the pyrclastic flow and were rescued on the beach there by Martinique officials.

Compère-Léandre stated the following when asked about his survival:

"I felt a terrible wind blowing, the earth began to tremble, and the sky suddenly became dark. I turned to go into the house, with great difficultuy climbed the three or four steps that separated me from my room, and felt my arms and legs burning, also my body. I dropped upon a table. At this moment four others sought refuge in my room, crying and writhing with pain, although their garments showed no sign of having been touched by flame. At the end of 10 minutes one of these, the young Delavaud girl, aged about 10 years, fell dead; the others left. I got up and went to another room, where I found the father Delavaud, still clothed and lying on the bed, dead. He was purple and inflated, but the clothing was intact. Crazed and almost overcome, I threw myself on a bed, inert and awaiting death. My senses returned to me in perhaps an hour, when I beheld the roof burning. With sufficient strength left, my legs bleeding and covered with burns, I ran to Fonds-Sait-Denis, six kilometers from Saint-Pierre."

One woman, a housemaid, also survived the pyroclastic flow but perished soon after; the only thing she remembered from the event was sudden heat. She died very shortly after being discovered. A third reported survivor was Havivra Da Ifrile. Included among the victims were the passengers and crews of several ships docked at Saint-Pierre.

One passenger steamship, the Roraima, which went missing on April 26, was believed to have been engulfed by ash from a preliminary explosion. However, it reached the port of Saint-Pierre at 6:30 AM, shortly before the eruption, and was set aflame by the pyroclastic flow. It later sank; its wreck is still present offshore of Saint-Pierre; 28 of her crew, and all the passengers, except two (a little girl and her creole nurse), were killed by the cloud.

Relief

At about 12:00 noon the acting governor of Martinique sent warship Suchet to investigate what had happened and the warship arrived off the burning town at about 12.30 p.m. The fierce heat beat back landing parties until nearly 3 p.m. when the captain came ashore on the Place Bertin, the tree-shaded square with gay cafés near the center of town. Not a tree was standing; the denuded trunks, scorched and bare, lay prone, torn out by the roots. The ground was littered with dead. Fire and a suffocating stench prevented any deeper exploration of the burning ruins.

Meanwhile, a number of survivors had been plucked from the sea by small boats; they were sailors who had been blown into the water by the impact of the blast, and who had clung to wreckage for hours. All were badly burned. In the village of Carbet, shielded from the fiery cloud by a high promontory at the southern end of the city, were more victims, also horribly burned; few of these lived longer than a few hours.

The area of devastation covered about eight square miles. Inside this area, the annihilation of life and property was total; outside was a second, clearly defined zone where there were casualties, but the material damage was less; while beyond this lay a strip in which vegetation was scorched but life was spared.

Many victims were in casual attitudes, their features calm and reposeful, indicating that death had overtaken them without warning and without pain; others were contorted in anguish. The clothing had been torn from nearly all the victims struck down out-of-doors. Some houses were almost pulverized; it was impossible even for persons familiar with the city to identify the foundations of many landmarks.

The city burned for days. Sanitation parties penetrated the calcined ruins bit by bit, to dispose of the dead by burning; burial was out of the question. The stench was sickening. Thousands of victims lay under a shroud of ashes, heaped in windrows several feet deep, caked by the rains; many of these bodies were not retrieved for weeks, and few were identifiable.

USA quickly offered help to Martinique authorities. On May 12 US president Theodore Roosevelt instructed the Secretaries of War, Navy, and Treasury to start relief measures at once. U.S. cruiser Cincinnati, lying at Santo Domingo, and the Navy tug Potomac at San Juan, Puerto Rico, were ordered to proceed to the disaster area under as soon as possible. President Roosevelt asked Congress for an immediate appropriation of $500,000 for emergency assistance to the victims of the calamity. The President said:" One of the greatest calamities in history has befallen our neighboring island of Martinique … The city of St. Pierre has ceased to exist … The government of France … informs us that Fort-de-France and the entire island of Martinique are still threatened. They therefore request that, for the purpose of rescuing the people who are in such deadly peril and threatened with starvation, the government of the United States may send as soon as possible the means of transporting them from the stricken island."

Congress voted for $200,000 of immediate assistance and set hearings to determine what larger sum might be needed when the full nature of the disaster could be learned. In an appeal for public funds the President empowered postmasters to receive donations for relief of the victims; a national committee of prominent citizens took charge of chartering supply ships. The UK, Germany, France, Italy, Denmark, Japan, Russia, and the Vatican also offered help.

Subsequent Activity

Mount Pelée continued to erupt until July 4, 1905.

  • On May 20, a second eruption equal to the first one in both type and force obliterated what was left of Saint-Pierre.
  • During a powerful eruption on August 30, 1902, a pyroclastic flow extended further east than the flows of 8 and 20 May. Although not quite as powerful as the previous two eruptions, the August 30 pyroclastic flow struck Morne Rouge (at least 800 fatalities), Ajoupa-Bouillon (250 fatalities), and parts of Basse-Pointe (25 fatalities) and Morne-Capot (10 fatalities). This was the last fatal eruption of Mount Pelée until the present time.

The study of the causes of the disaster marks the beginning of modern volcanology with the definition and the analysis of the deadliest volcanic hazard: the pyroclastic flows and surges, also called nuées ardentes (Fr: burning clouds). The eruption has also lent its name to the "Peléan eruption style". Among those who studied Mount Pelée were Angelo Heilprin and Antoine Lacroix. The illustrious Lacroix was the first to meticulously describe the nuée ardente phenomenon.

The destruction caused by the 1902 eruption was quickly publicized by recent modern means of communication. It brought to the attention of the public and governments the hazards and dangers of an active volcano. Many people had perished in a flash without even a reflex to move. The pyroclastic flow had swallowed the town and the people inside.

Volcanic Spine

Beginning in October 1902, a dramatic volcanic spine grew from the crater floor in the Étang Sec crater, reaching a maximum width of about 100 to 150 m (300 to 500 ft) and a height of about 300 m (1,000 ft). Called the "Needle of Pelée" or "Pelée's Tower", this extraordinary volcanic feature collapsed in 1903. Sometimes, the volcanic spine would rise up to 15 m (50 ft) a day, and became twice the height of the Washington Monument and more or less the same volume as the Great Pyramid of Egypt. It finally became unstable and collapsed into a pile of rubble in March 1903, after 11 months of growth.

Current status

As of 2010[update], the volcano currently lies quiescent above Saint-Pierre and Martinique. Before the 1902 eruption—as early as the summer of 1900—signs of increased fumarole activity were present in the Étang Sec crater (Scarth, p.30). Relatively minor phreatic (steam) eruptions that occurred in 1792 and 1851 were evidence that the volcano was active. Signs of unrest will almost certainly precede any future eruptive activity from Mount Pelée, and its past activity (including the violent eruptions uncovered by carbon dating) is an extremely important factor for hazard assessment.

Pelée is one of the most active volcanoes in the West Indies and it is likely to erupt again. Currently, Mount Pelée is under continuous watch by geophysicists and volcanologists (IPGP).

The city of Saint-Pierre was never restored, though some villages were built in its place. The estimated population of Commune of Saint-Pierre in 2004 was 4,544.

See also

References

External links

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Pierre Besses
6 July 2015
Aller à Saint-Pierre puis en direction du Prêcheur. De la Pointe Lamare ou de Quartier du Cimetière, prendre à droite et suivre la route jusqu'à la Grande Savane. Le parking est ici... bon courage !
Cedric Orny
19 March 2015
Montée jusqu'au deuxième refuge assez difficile. Mais paysage somptueux
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0.3km from Sentier du Chinois, Saint-Pierre 97260, Martinique

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