Gifts for a 25th Anniversary. 25th anniversary gifts should express your love and adoration in a simply elegant fashion. The 25th wedding anniversary is commemorated traditionally with gifts of silver, and we have a variety of options that make for a perfect silver wedding anniversary gift. Peruse silver lockets, delightful champagne glasses, commitment bands, and more for a gift that perfectly presents the 25-year anniversary motif.
The released energy travels as shock waves, called seismic waves, which may be felt and measured. The study of seismic waves is known as seismology, a word derived from a Greek word meaning to shake.. Seismographs are the instruments which record earthquakes. Scientists use these instruments as their principal tool to study seismic waves. They are very sensitive instruments that can detect, measure and record ground vibrations and their intensities during an earthquake.
In contrast, modern seismometers detect and convert any small movement in the Earth into an electrical signal for use in computer systems, as shown in the digital seismogram image of five seismic sensors which detected the magnitude 5.4 earthquake near Moe in Victoria on 19 June 2012. Earthquakes are detected by scientific instruments called seismometers. The word seismo originates from the Greek word seismos which means to shake or move violently and was later applied to the science and equipment associated with earthquakes.