Saturday, March 26, 2011

Section 4 - What more can be done to reduce the negative impacts of a volcanic eruption

With advanced studies in volcanoes, scientists know more about how a volcanoe react before eruption.
Also,with advanced technology, Scientists can measure the earth shaking, the temperature in the volcanoes and also the activities in the volcanoes.
Seismographs can detect small earthquakes, while tiltmeters and geodimeters can measure the subtle swelling of a volcano.With them , scientist can know about the volcanoes.
Through media, they can warned people about the eruption.
However, people should not just rely on the scientists.
This are the few things you can do to reduce the negative
impact of volcanic eruption:


• You could use Hazard Mapping and Satellite Monitoring so you can tell exactly when the volcano will erupt.

• You could also use barrier walls to penetrate the lava flow and use
• diversionary lava channels.
• Well validated emergency planning
• Nationalizing Tune in the radio or television for volcano updates.
• Listen for disaster sirens and warning signals.
• Review your emergency plan and gather your emergency supplies. Be sure to pack at least a 1-week supply of prescription medications.
• Prepare an emergency kit for your vehicle with food, flares, booster cables, maps, tools, a first aid kit, a fire extinguisher, sleeping bags, a flashlight, batteries, etc.
• Fill your vehicle’s gas tank.
• If no vehicle is available, make arrangements with friends or family for transportation, or follow authorities’ instructions on where to obtain transportation.


From an example
The 2010 eruptions of Eyjafjallajökull are a timeline of volcanic events at Eyjafjöll in Iceland which, although relatively small for volcanic eruptions, caused enormous disruption to air travel across western and northern Europe over an initial period of six days in April 2010. Additional localised disruption continued into May 2010. The eruption was declared officially over in October 2010, when snow on the glacier did not melt.
Seismic activity started at the end of 2009 and gradually increased in intensity until on 20 March 2010, a small eruption started rated as a 1 on the Volcanic Explosivity Index.
Beginning on 14 April 2010, the eruption entered a second phase and created an ash cloud that led to the closure of most of Europe's IFR airspace from 15 until 20 April 2010. Consequently, a very high proportion of flights within, to, and from Europe were cancelled, creating the highest level of air travel disruption since the Second World War.
The second phase of the eruption started on 14 April 2010 and resulted in an estimated 250 million cubic metres of ejected tephra. The ash plume rose to a height of approximately 9 kilometres which rates the explosive power of the eruption as a 4 on the Volcanic Explosivity Index.
By the morning of 24 May 2010, the view from the web camera installed on Þórólfsfell showed only a plume of water vapour surrounded by a blueish haze caused by the emission of sulphurous gases.
In October 2010, Ármann Höskuldsson, a scientist at the University of Iceland Institute of Earth Sciences stated that the eruption is officially over, although the area is still geothermally active and might erupt again.
About 500 farmers and their families from the areas of Fljótshlíð, Eyjafjöll, and Landeyjar were evacuated overnight and flights to and from Reykjavík and Keflavík International Airport were postponed, but on the evening of 21 March, domestic and international air traffic was allowed again.Inhabitants of the risk zone of Fljótshlíð, Eyjafjöll, and Landeyjar area were allowed to return to their farms and homes after an evening meeting with the Civil Protection Department on 22 March and the evacuation plan was temporarily dismissed. Instead, the police closed the road to Þórsmörk, and the four-wheel-drive trail from Skógar village to the Fimmvörðuháls mountain pass, but these roads and trails were reopened on 29 March, though only for suitable four-wheel drives. When the second fissure appeared, the road was closed again because of the danger of flash floods, which could have developed if the fissure had opened near big ice caps or other snow reservoirs, but the road was again opened at around noon on 1 April.Nobody died in the eruption.

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