An 8.1-magnitude earthquake in 2009 worsened land subsidence in American Samoa. NASA scientists introduced InSAR technology, revealing increased subsidence rates post-earthquake. This research underscores the need for accurate data in global coastal resilience planning. On September 29, 2009, an
Landsat image of American Samoa’s Tutuila Island, acquired on July 22, 2022, with the Operational Land Imager on Landsat 8. Credit: NASA Earth Observatory/Lauren Dauphinscientists introduced InSAR technology, revealing increased subsidence rates post-earthquake. This research underscores the need for accurate data in global coastal resilience planning.
on the islands. The earthquake also exacerbated another problem in American Samoa: subsidence, or the sinking of land. When combined with relative sea level rise, land sinking can increase the frequency and amount of coastal flooding.Protecting against flooding on islands requires reliable measurements of how much the ground is sinking and where, said Jeanne Sauber, a geophysicist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland.
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