Eruptive events of mount merapi
Senin, 08 November 2010
On Monday afternoon 25 October 2010 Merapi erupted three times, spewing lava down its southern and southeastern slopes. Three major eruptions were recorded at 14:04, 14:24 and 15:15.[5] On 25 October 222 volcanic seismic events and 454 avalanche seismic events were recorded by Center for Volcanology and Geological Hazard Mitigation monitoring staff at Merapi.
The eruptions on 26 October started at 17:02. By 18:54 pyroclastic activity had begun to subside following 12 eruption associated events being recorded by CVGHM monitors. In the 24 hours of 26 October 232 volcanic seismic events, 269 avalanche seismic events, 4 lava flow seismic events and 6 heat clouds were recorded by Center for Volcanology and Geological Hazard Mitigation monitoring staff at Merapi. The eruptive events of 26 October were classified as an explosive event with volcanic bursts of ejected material, visible flame and pyroclastic hot air flows. A column of smoke rose from the top to a vertical distance of 1.5 kilometres (0.93 mi) from the summit of the Mount Merapi.
On Friday 29 October eruptive activity included lava ejection with hot ash clouds reported to be flowing 3 kilometres (1.9 mi) down the slopes of the mountain and lasting four to nine minutes. Ash falls reached as far as the Central Java town of Magelang. Scientists monitoring the volcano including Surono, chief of the Volcanology and Geological Disaster Mitigation Center (PVMBG) were optimistic that the volcanic activity should decrease following the release of lava. Safari Dwiyono, a scientist monitoring Mt. Merapi for 15 years, said the volcanic activity appeared to be easing pressure behind a lava dome that had formed in the crater.
By early on the morning of Saturday 30 October the volcano was erupting again. Sri Sumarti, head of the Merapi section at the Volcano Investigation and Technology Development Institution (BPPTK), reported the eruptions were louder and stronger than the eruptions of the 26 October. Those earlier eruptions on the previous Tuesday killed 34 people. Ash from the eruptions on 30 October fell more than 30 kilometres (19 mi) away and now included ash falls upon the city of Yogyakarta. Soldiers and police posted nearest the volcano were seen fleeing along with hundreds of residents quickly clogging roads with cars and motorcycles. Black soot fell across a vast area. The morning eruptions lasted for 22 minutes and heat clouds flowed into the Krasak and Boyong Rivers also rising 3.5 kilometres (11,000 ft) into the air, westward toward Magelang. Yogyakarta’s Adisucipto Airport was temporarily closed from 05:00 to 07:00. On 30 October, Subandrio, head of the BPPTK suggested there would be further eruptions as lava continued to push it's way up into the volcano's lave dome.
On 3 November heat clouds travelled up to 10 kilometres (6.2 mi) away from the eruption forcing the government to evacuate people from within the refugee camps set up to accommodate those already dislocated by the volcano. Eruptions on the afternoon of Wednesday 3 November followed a morning eruption that sent hot gas clouds down the volcano's slopes. The volcano spewed clouds of ash and gas 5 kilometres (3.1 mi) into the sky for more than an hour on 3 November. The eruptions of that day were reported as being the largest since the eruptions commenced.
Surono, head of Indonesia's vulcanology agency announced on 3 November that he was moving the shelters to 15 kilometres (9.3 mi) away from the summit. Speaking on Indonesia's Metro TV network he said, "this is the first time that the eruption has continued for more than an hour, so I decided to move the shelters to 15 km away from the summit". The shelters had previously been set up 10 kilometres (6.2 mi) away. Surono added that the energy from the eruption on 3 November was three times greater than that of the first eruption in the previous week.[23] Bambang Ervan, a spokesman from the Transportation Ministry, said an official warning had been issued to all airlines to “use alternative routes for safety reasons due to the volcanic ash.” From 2 November several airlines including Garuda, AirAsia and Silkair international flights to both Yogyakarta and Solo were either suspended or re-routed due to the eruptive activity.
Heavy rain during the night of 3-4 November triggered lahars with mixtures of water and rock debris cascading down the Kuning, Gendol, Woro, Boyong, Krasak and Opak rivers on the slopes of the volcano. A bridge was destroyed and riverbanks damaged. The eruption at 05:55 on the morning of 4 November was reported as being five times stronger than the initial eruption on 26 October 2010. On 4 November Merapi had been erupting for 24 hours without stopping. Heat clouds of 600 to 800 degrees Celsius spread as far as 11.5 kilometers from the crater reaching toward the edge of the then 15 kilometres (9.3 mi) exclusion zone, and lava flowed into the mountain’s rivers.
Merapi erupted early on Friday 5 November 2010. Volcanic ash fell at Cangkringan village and its surroundings 10 kilometres (6.2 mi). Due to continuous large eruptions, the government extended the safety zone to 20 kilometres (12 mi) radius and Yogyakarta's airport was closed again for 3 hours in the morning.[26][27] Volcanologists reported the eruptions of Friday 5 November to be the biggest since the 1870s and officials announced by loudspeaker that the mountain's danger zone had been expanded to 20 kilometers from the crater. Bronggang, a village 15 kilometers from the crater, had streets blanketed by ash up to 30-centimeters deep. By 5 November more than 100,000 people had been evacuated and the scientists monitoring the events were withdrawn from their posts to a safer distance.
By Saturday, 6 November the eruptions and ash falls in the surrounding area of Central Java had led to the increase in prices of many vegetables, such as potatoes and water spinach . Schools were reported closed up to 120 kilometres (75 mi) west of Yogyakarta.[29] The Center for Volcanology and Geological Hazard Mitigation observation outposts reported high intensity ash falls on the slopes of Mt Merapi. At 23:51 a flash of smoke, hot air winds and flames as high as 3 kilometres (1.9 mi) occurred to the west, north and to the east.[30] The Center for Volcanology and Geological Hazard Mitigation observation outposts reported high intensity ash falls on the slopes of Mt Merapi. At 23:51 a flash of smoke, hot air winds and flames as high as 3 kilometres (1.9 mi) occurred to the west, north and to the east.
On Sunday, 7 November at 03:02 hot ash clouds flowed in the direction Gendol and Woro rivers. Volcanic earthquake and hot ash cloud events were reported to have increased from the previous day.
The eruptions on 26 October started at 17:02. By 18:54 pyroclastic activity had begun to subside following 12 eruption associated events being recorded by CVGHM monitors. In the 24 hours of 26 October 232 volcanic seismic events, 269 avalanche seismic events, 4 lava flow seismic events and 6 heat clouds were recorded by Center for Volcanology and Geological Hazard Mitigation monitoring staff at Merapi. The eruptive events of 26 October were classified as an explosive event with volcanic bursts of ejected material, visible flame and pyroclastic hot air flows. A column of smoke rose from the top to a vertical distance of 1.5 kilometres (0.93 mi) from the summit of the Mount Merapi.
On Friday 29 October eruptive activity included lava ejection with hot ash clouds reported to be flowing 3 kilometres (1.9 mi) down the slopes of the mountain and lasting four to nine minutes. Ash falls reached as far as the Central Java town of Magelang. Scientists monitoring the volcano including Surono, chief of the Volcanology and Geological Disaster Mitigation Center (PVMBG) were optimistic that the volcanic activity should decrease following the release of lava. Safari Dwiyono, a scientist monitoring Mt. Merapi for 15 years, said the volcanic activity appeared to be easing pressure behind a lava dome that had formed in the crater.
By early on the morning of Saturday 30 October the volcano was erupting again. Sri Sumarti, head of the Merapi section at the Volcano Investigation and Technology Development Institution (BPPTK), reported the eruptions were louder and stronger than the eruptions of the 26 October. Those earlier eruptions on the previous Tuesday killed 34 people. Ash from the eruptions on 30 October fell more than 30 kilometres (19 mi) away and now included ash falls upon the city of Yogyakarta. Soldiers and police posted nearest the volcano were seen fleeing along with hundreds of residents quickly clogging roads with cars and motorcycles. Black soot fell across a vast area. The morning eruptions lasted for 22 minutes and heat clouds flowed into the Krasak and Boyong Rivers also rising 3.5 kilometres (11,000 ft) into the air, westward toward Magelang. Yogyakarta’s Adisucipto Airport was temporarily closed from 05:00 to 07:00. On 30 October, Subandrio, head of the BPPTK suggested there would be further eruptions as lava continued to push it's way up into the volcano's lave dome.
On 3 November heat clouds travelled up to 10 kilometres (6.2 mi) away from the eruption forcing the government to evacuate people from within the refugee camps set up to accommodate those already dislocated by the volcano. Eruptions on the afternoon of Wednesday 3 November followed a morning eruption that sent hot gas clouds down the volcano's slopes. The volcano spewed clouds of ash and gas 5 kilometres (3.1 mi) into the sky for more than an hour on 3 November. The eruptions of that day were reported as being the largest since the eruptions commenced.
Surono, head of Indonesia's vulcanology agency announced on 3 November that he was moving the shelters to 15 kilometres (9.3 mi) away from the summit. Speaking on Indonesia's Metro TV network he said, "this is the first time that the eruption has continued for more than an hour, so I decided to move the shelters to 15 km away from the summit". The shelters had previously been set up 10 kilometres (6.2 mi) away. Surono added that the energy from the eruption on 3 November was three times greater than that of the first eruption in the previous week.[23] Bambang Ervan, a spokesman from the Transportation Ministry, said an official warning had been issued to all airlines to “use alternative routes for safety reasons due to the volcanic ash.” From 2 November several airlines including Garuda, AirAsia and Silkair international flights to both Yogyakarta and Solo were either suspended or re-routed due to the eruptive activity.
Heavy rain during the night of 3-4 November triggered lahars with mixtures of water and rock debris cascading down the Kuning, Gendol, Woro, Boyong, Krasak and Opak rivers on the slopes of the volcano. A bridge was destroyed and riverbanks damaged. The eruption at 05:55 on the morning of 4 November was reported as being five times stronger than the initial eruption on 26 October 2010. On 4 November Merapi had been erupting for 24 hours without stopping. Heat clouds of 600 to 800 degrees Celsius spread as far as 11.5 kilometers from the crater reaching toward the edge of the then 15 kilometres (9.3 mi) exclusion zone, and lava flowed into the mountain’s rivers.
Merapi erupted early on Friday 5 November 2010. Volcanic ash fell at Cangkringan village and its surroundings 10 kilometres (6.2 mi). Due to continuous large eruptions, the government extended the safety zone to 20 kilometres (12 mi) radius and Yogyakarta's airport was closed again for 3 hours in the morning.[26][27] Volcanologists reported the eruptions of Friday 5 November to be the biggest since the 1870s and officials announced by loudspeaker that the mountain's danger zone had been expanded to 20 kilometers from the crater. Bronggang, a village 15 kilometers from the crater, had streets blanketed by ash up to 30-centimeters deep. By 5 November more than 100,000 people had been evacuated and the scientists monitoring the events were withdrawn from their posts to a safer distance.
By Saturday, 6 November the eruptions and ash falls in the surrounding area of Central Java had led to the increase in prices of many vegetables, such as potatoes and water spinach . Schools were reported closed up to 120 kilometres (75 mi) west of Yogyakarta.[29] The Center for Volcanology and Geological Hazard Mitigation observation outposts reported high intensity ash falls on the slopes of Mt Merapi. At 23:51 a flash of smoke, hot air winds and flames as high as 3 kilometres (1.9 mi) occurred to the west, north and to the east.[30] The Center for Volcanology and Geological Hazard Mitigation observation outposts reported high intensity ash falls on the slopes of Mt Merapi. At 23:51 a flash of smoke, hot air winds and flames as high as 3 kilometres (1.9 mi) occurred to the west, north and to the east.
On Sunday, 7 November at 03:02 hot ash clouds flowed in the direction Gendol and Woro rivers. Volcanic earthquake and hot ash cloud events were reported to have increased from the previous day.
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