The new IASPEI standards for determining magnitudes from digital data and their relation to classical magnitudes

Why there is a need for measurement standards of magnitudes:

In October 2005, the Commission on Seismic Observation and Interpretation of the
International Association of Seismology and Physics of the Earth´s Interior (IASPEI) adopted
the summary recommendations made by the IASPEI Working Group on Magnitudes on new
measurement standards for widely used local, regional and teleseismic magnitude scales
(IASPEI, 2005). These recommendations have recently been refined and detailed (IASPEI,
2013) and a final scientific report, to be published in a reputable international journal, is
currently under preparation.