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Magnitude Formulae and Intensity–Magnitude Relations for Early Instrumental Earthquakes in the Iberian Region

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Abstract

The magnitudes of early instrumentally recorded earthquakes in the Iberian region (1912–1962) have been studied through processing of digitized seismograms of Wiechert seismograph and analysis of macroseismic information. A magnitude system based on instrumental registrations and macroseismic observations has been proposed. It consists of two compatible magnitude formulae depending on the total duration of seismic oscillations and on the maximum ground amplitude/period ratio of surface waves and includes correspondent intensity–magnitude relationships.

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Authors and Affiliations

  1. Geophysical Institute of the B.A.S., Acad. G. Bonchev str., bl.3, 1113, Sofia, Bulgaria

    Elena Samardjieva

  2. Geophysical Observatory of Toledo, National Geographical Institute, 45080, Toledo, Spain

    Gonzalo Payo

  3. Department of Geophysics, University of Zaragoza, P. Cerbuna 12, 50009, Zaragoza, Spain

    Jose Badal

Authors
  1. Elena Samardjieva
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  2. Gonzalo Payo
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  3. Jose Badal
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Samardjieva, E., Payo, G. & Badal, J. Magnitude Formulae and Intensity–Magnitude Relations for Early Instrumental Earthquakes in the Iberian Region. Natural Hazards 19, 189–204 (1999). https://doi.org/10.1023/A:1008057832374

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  • DOI: https://doi.org/10.1023/A:1008057832374

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