Descriptive statistical model of earthquake source radiation and its application to an estimation of short‐period strong motion

Summary. A wide-band source spectrum scaling law is derived from various data sources; its main features are: a lack of similitude and two characteristic frequencies of about 0.2 and 5-10 Hz. An average short-period radiation flux from the source surface does not greatly depend on magnitude; it is about 3 x lO'erg cm-2 s and short-period efficiency is about 10 per cent. For sources of great earthquakes a short-period radiation flux is relatively low. The spectrum scaling law is used to determine near-field accelerations. Formulae to estimate 'static' and wavefield accelerations of incoherently radiating sources are derived and applied to calculate the average relation between maximum acceleration and intensity, and distance and magnitude. Theoretical relations agree well with the empirical ones.

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