Scientists said they have new evidence of increasing strain where two tectonic plates underlie the world’s largest river delta. They estimate that at least 140 million people in the region could be affected if the boundary ruptures; the destruction could come not only from the direct results of shaking, but changes in the courses of great rivers, and in the level of land already perilously close to sea level.
The newly identified threat is a subduction zone, where one section of the earth’s crust, or a tectonic plate, is slowly thrusting under another.
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