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  _____      ___    __    __     ___     _    _   
 /  ___||   / _ \\  \ \\ / //   / _ \\  | \  / || 
| // __    | / \ ||  \ \/ //   | / \ || |  \/  || 
| \\_\ ||  | \_/ ||   \  //    | \_/ || | .  . || 
 \____//    \___//     \//      \___//  |_|\/|_|| 
  `---`     `---`       `       `---`   `-`  `-`

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發送短信 : SH surface wave propagating in a strain-gradient layered half-space