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Aug 6 / Dave Schumaker

Sumatra Earthquake Caused Gravity Change

Devastation from the 2004 Indian Ocean Earthquake.According to a new article published in the latest issue of the journal of Science from Ohio State University, NASA’s GRACE satellites have detected a gravitational change in the Indian Ocean after the 2004 Indian Ocean earthquake.

Unfortunately, the article from OSU is rather light on details. It simply explains, “The earthquake changed the gravity in two ways that we were able to detect. First, the quake triggered the massive uplift of the sea floor, changing the geometry of the region, and second, the density of the rock beneath the sea floor was changed after the slippage. An increase or decrease in density produces a detectable gravity change…”

The abstract is available for free via the Journal of Science’s website, however you will need a subscription to access the full article.

Research from OSU and the GRACE satellites have previously been covered on Geology News in an article dealing with the Permian Extinction.

GRACE satellite data.

GRACE satellite data.

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