Known for hot temperatures, Southern California and the rest of the Southwest United States are undergoing a cold snap that has set records in many areas throughout the region.
Periodogram is the spectrum of a set of time signal usually obtained by fast Fourier transform (FFT). It usually shows frequency as x-axis, and magnit... This page may be out of date.
A seismogram is a graph output by a seismograph. It is a record of the ground motion at a measuring station as a function of time.Seismograms typically record motions in three cartesian axes (x, y, and z), with the z axis perpendicular to the Earth's surface and the x-and y-axes parallel to the surface. seismogram is a graph output by a seismograph. It is a record of the ground motion at a measuring station as a function of time.