San Diego, US: Technology used by NASA has led to some surprising discoveries about earthquake activity in San Diego County.
The first-ever images of earthquake movement from a radar mounted on a plane were revealed recently. The photos are higher in resolution than satellite pictures.
In the photos, the colours measure the distance in which the Earth’s crust is moving, and based on the images taken, NASA has determined the Easter earthquake centered in Mexico shifted the crust in the Calexico area down and to the south — a distance of 2.5 feet.
NASA geophysicist Eric Fielding said, “The airplane gives us much higher resolution and more flexibility.”
Geologists said the Easter quake caused the Earth’s crust to lean on itself, which led to the recent earthquake.
“The stress is going to be transferred, and that means aftershocks. It’s gone so far we’ve even moved to another fault,” said San Diego State University geologist Dr. Pat Abbott.
The NASA images also showed from the lack of movement in some areas, the Easter earthquake is not directly connected to the potent Elsinore Fault as previously thought. “That’s good news because it tells us why the earthquake stopped in Mexico just short of the border,” said Fielding.
Last week, NASA’s plane-mounted radar took a close look at the San Jacinto Fault, which was the site of the quake.