Ground vibration boom Ground vibration boom Ground vibration boom is a phenomenon of very large increase in ground vibrations generated by high-speed railway trains travelling at speeds higher than the velocity of Rayleigh surface waves in the supporting ground. This phenomenon, which is similar to a sonic boom from supersonic aircraft, was theoretically predicted in 1994. Its first experimental observation took place in 1997-1998 on the newly built high-speed railway line in Sweden (from Gothenburg to Malmo) for high-speed trains X 2000. At some locations along this line characterised by very soft ground (near Ledsgard) the Rayleigh wave velocity was as low as
Twang Twang Shock-A-Boom Twang Twang Shock-A-Boom Twang Twang Shock-a-Boom is an acoustic three-piece band led by Davíd Garza. The name is derived from the sounds of the guitar, bass, and drums. Twang Twang Shock-a-Boom was described by the Austin Chronicle as “one of the most breathtaking musical projects Austin has ever seen.” . For 10 months, the trio of Davíd Garza, Jeff Haley, and Chris Searles played humorous tunes with the bare-bones setup of guitar, upright bass, and a guitar case standing in for drums. It began when Garza and his music-school friends decided to go busk in the West Mall of Austin,