Engineer Guy wrote: 'The Thigh Bone connected to the Leg Bone', as the old Song goes...
Engineer Guy, thanks for your informative and always interesting posts. In keeping with the Thigh Bone connected to the Leg Bone theme, the following was reported in the Austin American Statesman newspaper on March 16th:
Japan earthquake displaced water in Edwards Aquifer
The water level of Texas' Edwards Aquifer was displaced about a foot Friday after energy released from a massive earthquake near Japan put the squeeze on the underground rock formation that supplies drinking water for much of Central Texas.
The 9.0-magnitude quake caused its walls to contract and expand, officials with the Edwards Aquifer Authority said Wednesday. A monitor in a Bexar County well that continuously records the aquifer's water level noted the oscillations, which lasted about two hours from late Thursday to early Friday morning, said Geary Schindel , the authority's chief technical officer. The force from the quake took about 15 minutes to reach the aquifer, he said.
"When a wave from an earthquake passes, it slightly compresses and dilates the aquifer, and the water will shoot up and down," Schindel said. "Any time we see a major earthquake, it's commonly recorded in that well. They act as seismographs."
The oscillations during high-energy earthquakes are common in artesian aquifers, or confined aquifers, where the water is pressurized, including the Edwards Aquifer, Schindel said. "We saw Haiti, we saw Sumatra, Japan, a couple in Mexico and Alaska," he said of recent earthquakes....