Broadband Magnitude
Broadband Magnitude : Body-wave and surface-wave magnitudes that are based (in contrast to amplitude/period ratios measured on more or less narrow-band records of ground displacement) on direct measurements of ground motion velocity on broadband records. Examples are the IASPEI (2011) recommended P-wave magnitude standard mB(BB) or mB_BB, measured in the period range between 0.2s to 30 s, and the new surface-wave magnitude standard Ms(BB) or MB_BB, measured at periods between 3 s and 60 s. As compared to more narrow-band magnitudes, such as mb, measured at periods around 1 s, and the surface-wave magnitude Ms, measured at periods around 20 s, broadband magnitudes are less prone to the underestimation of magnitude for large seismic events (in the case of mb) or smaller events (in the case of Ms(20) = Ms_20). See Chapter 3 and IS 3.3 in this Manual and Bormann et al. (2009)
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