On
December 26, 2004, one of the largest earthquakes in recorded history reshaped
the floor of the Indian Ocean. The magnitude 9.1 Sumatra-Andaman temblor
generated tsunami waves that caused widespread damage to nations around the
Indian Ocean, with most of the damage affecting Indonesia. One decade later,
recovery is apparent in areas such as this stretch of coastline along the
island of Sumatra in western Indonesia.
The
series of natural-color images above shows a small area along the Sumatran
coast in Aceh province, north of Meulaboah. In this region, the wave cut a
swath of near-total destruction 1.5 kilometers (roughly one mile) in most
places, but penetrating farther in many others.
The
first two images, acquired with Landsat 7's Enhanced Thematic Mapper Plus
(ETM+) on December 13, 2004 (top) and December 29, 2004 (middle), show the area
before and after the tsunami crashed ashore. The third image, acquired by the Operational
Land Imager (OLI) on Landsat 8, shows the same scene almost ten years later on
November 15, 2014 (bottom).
According
to research published in 2010, coastline along the Aceh coast eroded back about
500 meters (1,600 feet) during the tsunami. Along straight coastline north of
Meulaboah, beach ridges running parallel to the shoreline eroded and streams
became connected directly to the ocean. Within weeks, however, observations
showed a new coastline beginning to emerge that closely resembled the old one.
Within a few years, beach ridges were recovering and vegetation was returning.
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