Louisiana

WASHINGTON — It’s common knowledge the Louisiana coast is quietly sinking into the Gulf of Mexico. But new research suggests we may have been underestimating how quickly it’s happening.

A paper published Wednesday in the Geological Society of America bulletin GSA Today includes an updated map of the Louisiana coastline and the rate at which it’s sinking into the sea, a process scientists call ‘‘subsidence,’’ which occurs in addition to the sea-level rise caused by climate change. The map suggests that, on average, Louisiana’s coast is sinking a little over a third of an inch per year.

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