Traza sísmica

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En sismología, una traza sísmica se refiere a la curva grabada por un sismógrafo sencillo, when se mide el movimiento en el sub-suelo. El nombre proviene de la curva trazada por el sismógrafo, a medida de que un rollo de papel rota y una aguja con tinta deja un trazo (traza), de la cual se puede extraer información acerca de las propiedades del sub-suelo. Los instrumentos actuales graban los datos de forma digital, y la palabra traza, por lo tanto, adquiere el sentido de una curva digital.

A regular set of measurements from one seismic channel (or stacked channels); a digital one-dimensional array of regularly sampled numerical values.


Complex seismic trace

The recorded seismic trace is considered the real part of the complex trace. By phase shifting the recorded trace by 90 degrees, we can obtain the imaginary part of the complex trace. The complex seismic trace is a complex function whose real and imaginary part are the previously mentioned.[1] From the complex trace, one can now define seismic attributes such as the complex amplitude, phase, instantaneous phase and instantaneous frequency.


References

  1. Barnes, A.E. (2007). "A tutorial on complex seismic trace analysis". Geophysics 72: W33-W43. doi:10.1190/1.2785048.