Devastation in Palu after the earthquake, tsunami
Devastation in Palu after the earthquake, tsunami
Devastation in Palu after the earthquake, tsunami
the powerful and shallow earthquake that shook the north coast of the island of Sulawesi on September 28, 2018, caused tremendous damage. Houses throughout Palu, Indonesia, have been crushed. A series of tsunami waves decimated the coast. The destructive flows of mud and earth destroyed several areas of the interior of the city of 300,000 people.
the Operational Earth Imager (OLI) in Landsat 8 He captured a natural color image of Palu on October 2, 2018. The second image shows the same area before the earthquake and tsunami. The false color (bands 6-5-2) the images facilitate the distinction between urban areas (purple-gray), vegetation (green) and inverted soil (brown and fire).
While coastal areas suffered extensive damage from the tsunami, the image also reveals three large mud flows inland that caused severe damage in densely populated areas. The intense tremor of the earthquake may have triggered liquefaction Y lateral widening, Processes in which wet sand and silt acquire the characteristics of a liquid. These processes, which are especially common near streams and on reclaimed land, can produce destructive avalanches even in relatively flat areas.
Scientists we were surprised That the earthquake generated such a large tsunami. Normally, large tsunamis occur after megathrust earthquakes That cause vertical displacement. But the Sulawesi earthquake happened along a slip failure, which means that the movement was horizontal. Some scientists suspect that a underwater gliding, shaken by the earthquake, it could have provided the energy that fueled the destructive tsunami. In addition, the narrow and finger-shaped form of Palu Bay probably amplified the rapid surge of water made it even more dangerous.
Images from the NASA Earth Observatory by Joshua Stevens, using Landsat data from the United States Geological Survey. Story of Adam Voiland.
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