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  • gumbietygress@juno.com
    Working through the stack of ... stuff ... on the desk. Found this note: Edwards Aquifer respond to Japan quake. The Edwards Aquifer is the limestone layer
    Message 1 of 1 , Aug 31, 2012
      Working through the stack of ... stuff ... on the desk. Found this note: Edwards Aquifer respond to Japan quake.
       
      The Edwards Aquifer is the limestone layer that brings water to, well, much of Central Texas. Think of it as a sponge -- the rock full of interlocking pores through which water moves, trickles to flows.
      Anyway during the Japan Quake of 2011 -- the other side of the world -- so much energy was released, that the water in the aquifer 'sloshed' by as much as a foot. Amazing!
       
      http://www.statesman.com/news/local/japan-earthquake-displaced-water-in-edwards-aquifer-1326387.html  (article below)
      more articles can be found by googling (or binging) on  "edwards aquifer response to japan quake"
       
       
       

      Japan earthquake displaced water in Edwards Aquifer

       

      Energy released from last week's massive earthquake caused the walls of the sprawling aquifer to contract and expand, official says

       
      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. A reading from a well that monitors the aquifer's water level shows the water's surface fluctuating wildly early Friday morning. The fluctuations began about 15 minutes after the earthquake near Japan and lasted for about two hours. MSL stands for mean sea level.
      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. A reading from a well that monitors the aquifer's water level shows the water's surface fluctuating wildly early Friday morning. The fluctuations began about 15 minutes after the earthquake near Japan and lasted for about two hours. MSL stands for mean sea level.
       
      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.
       
      The well, named J-17 , has been monitoring the aquifer's water level in Bexar County since the 1950s, Schindel said. A float that rests on the water surface hundreds of feet underground is connected to a wire and a wheel that records the level on pen and paper, he said. Water restrictions are tied to readings, Schindel said.
       
      The sprawling aquifer cuts underground through Central Texas and provides drinking water for about 1.7 million people, including most of San Antonio, said Roland Ruiz, spokesman for the regulatory agency that manages and protects the aquifer's San Antonio segment.
       
      ddoolittle@...; 445-3671
       
       


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