Abstract
The concern for the development of more appropriate instrumental criteria to be used in seismic intensity assessment originates in the situation raised by the attempt to assess intensity on the basis of an accelerographic record obtained during the Vrancea earthquake of 1977.03.04. The intolerable gap of about two intensity units between the results of the use of peak acceleration and velocity criteria specified by the MSK scale respectively, required a critical analysis of the assumptions on which these criteria relied. It turned out that the cause of this shortcoming is due to the implicit rigid assumption on the expression of the dynamic factor of response spectra. Two alternative sources for developing appropriate, flexible, criteria relied on one hand on an envelope of response spectra and on the other hand on the integral of the square of acceleration. After defining criteria corresponding to a global intensity, criteria for determining intensity related to some oscillation frequency, as well as to intensity averaged upon a spectral band (leading to the concept of intensity spectrum) were defined. It turned out that the alternative definitions adopted led to strong correlations and that a good correlation with the results of post-earthquake field surveys was obtained too. Analytical developments as well as illustrative applications to the cases of some earthquakes are presented. Some problems concerning the calibration of instrumental criteria developed are revealed too.
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Acknowledgements
The author Horea Sandi is deeply indebted to the memory of Dr. Ioan Sorin Borcia, with whom he cooperated for more than four decades and who played the major role in performing the computer work on which this paper relies.
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Sandi, H., Borcia, I.S. (2016). An Attempt to Bridge the Gap Between the Traditional Concept of Seismic Intensity and the Need of Accuracy Required by Engineering Activities. In: Vacareanu, R., Ionescu, C. (eds) The 1940 Vrancea Earthquake. Issues, Insights and Lessons Learnt. Springer Natural Hazards. Springer, Cham. https://doi.org/10.1007/978-3-319-29844-3_19
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DOI: https://doi.org/10.1007/978-3-319-29844-3_19
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