THE WORLD BIGEST T SUNAMI

MANY PEOPLE LOSS IN T SUNAMI

Credit Jacques Descloitres, MODIS Rapid Response Team, NASA/GSFC The island of Sumatra suffered from both the rumblings of the submarine earthquake and the tsunamis that were generated on December 26, 2004. Within minutes of the quake, the sea surged ashore, bringing destruction to the coasts of the northern Sumatra. This pair of images from the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite shows the Aceh province of northern Sumatra, Indonesia, on December 17, 2004, before the quake and on December 29, 2004, three days after the catastrophe.

Though MODIS was not specifically designed to make the very detailed observations that are usually necessary for mapping coastline changes, the sensor nevertheless observed obvious differences in the Sumatran coastline. On December 17, the green vegetation along the west coast appears to reach all the way to the sea, with only an occasional thin stretch of white that is likely sand. After the earthquake and tsunamis, the entire western coast is lined with a noticeable purplish-brown border.

The brownish border could be deposited sand, or perhaps exposed soil that was stripped bare of vegetation when the large waves rushed ashore and then raced away. On a moderate-resolution image such as this, the affected area may seem small, but each pixel in the full resolution image is 250 by 250 meters. In places the brown strip reaches inland roughly 13 pixels, equal to a distance of 3.25 kilometers, or about 2 miles. On the northern tip of the island, the incursion is even larger.

As October drew to a close, Hurricane Paul was approaching the southern tip of Mexico’s Baja Peninsula. The sixteenth named Pacific storm of the 2006 season, Paul was whipping up sustained winds of 165 kilometers per hour (105 miles per hour) at the time of the National Hurricane Center’s 11:00 a.m. Pacific Daylight Time briefing on October 23. The storm track and intensity forecasts for Paul were still uncertain at that time, but landfall along the southern tip of Baja Peninsula as a strong storm was still a possibility.

In this image from the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite on October 22, 2006, the eye of Hurricane Paul was several hundreds kilometers southwest of Baja. A bright disk of clouds spirals counter-clockwise into a cloudy eye at the heart of the storm. In places, this smooth-seeming cloud deck is rippled by puffy cloud tops—a sign of thunderstorms lofting heat and moisture high into the atmosphere. The southern tip of Baja Peninsula appears along the top edge of the image.

On November 29, 2005, a tropical cyclone brewed in the Bay of Bengal off the southern coast of India near the island of Sri Lanka. This image of the organizing storm, called Baaz, was captured by the Moderate Resolution Imaging Spectroradiometer (MODIS) on Tuesday, November 29, at 5:05 UTC (10:35 a.m. local time). The storm does not have the classical cyclone shape in the image, but some arcing bands of clouds are beginning to take shape to the northeast of the storm’s core, and several areas of “boiling” clouds suggest intense thunderstorm activity.

As of the early afternoon of November 30, the storm had slowed in its west-northwest progress toward land, and forecasters at the Navy’s Joint Typhoon Warning Center were predicting that the storm would be arriving at the coast of India within 48 hours. According to news reports, thousands of people were evacuating the low-lying coastal states of Tamil Nadu and Andhra Pradesh in southern India, areas which were affected by the December 2004 tsunami as well as by flooding in recent weeks. Metadata Sensor Terra/MODIS Visualization Date 2005-11-30