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Anak Krakatau: Finnish radar satellite surveys tsunami volcano



  Anak Krakatau

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ICEYE

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The view was generated from data collected on Wednesday

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Here is a new view of Anak Krakatau, the collapsed Indonesian volcano that spawned the December 22 tsunami that devastated the local shores.

The image was compiled from radar images taken by the ICEYE-X2 on Wednesday.

This is a small innovative spacecraft from Finland, which will soon be part of a large, orbiting sensor network.

The volcano continues to develop after the catastrophic failure of the cone.

The original height of 340 m was The disaster was reduced to only 110 meters, but since then, more outbreaks have begun to reshape the residual structure.

"This picture indicates that the building is in a construction phase and the crater is no longer connected to the sea." Andy Hopper from Leeds University, United Kingdom.

More than 400 people died on the shores of Java and Sumatra on the Sunda Strait when the tsunami hit.

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In the days immediately following the collapse, scientists relied heavily on radar satellites to understand what had happened.

Radar sees day or night on the ground and penetrates even thick clouds.

The researchers were fortunate that the European Union's Sentinel platform was launched just hours after the event. However, such observations are not always up-to-date.

ICEYE from Helsinki hopes to remedy this with a constellation of small radar satellites.

ICEYE-X2 is the second spacecraft to be launched. Another five to eight will rise this year. All of these platforms are about the size of a suitcase – much smaller than the traditional radar sensors in orbit.

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The image at the top of this page is truncated and compressed, but the original data produces a 3m by 3m resolution (features greater than those on the ground can be distinguished).

ICEYE wants to pair this sharp vision with a high temporal resolution, which means that a single point on the Earth's surface could be measured several times a day.

A constellation of 30 in-orbit platforms could observe locations in mid-latitudes such as London or Paris about 15 times a day. Indonesia states that according to its budget, it will double the amount of its disaster relief budget, becoming a deadly year for natural disasters in a decade.

In addition to the event on December 22, an earthquake and tsunami in Sulawesi on September killed more than 2,000 people.

The Indonesian Ministry of Finance states that $ 750 million will be reserved for immediate response after disasters, while another $ 350 million will be reserved for reconstruction work.


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