Empirical Relationships for Magnitude and Source-to-Site Distance Conversions Using Recently Compiled Turkish Strong-Ground Motion Database

Abstract eng:
We derived empirical relationships for magnitude conversion using the recently compiled Turkish strong-motion database. The database also provides useful information about the relations between different source-to-site distance metrics (epicentral distance, Repi, hypocentral distance, Rhyp, Joyner-Boore distance, Rjb etc) that are effectively used in the seismic hazard analysis. The empirical magnitude equations re-scale body-wave (mb), surface-wave (Ms), local (ML) and duration (Md) magnitudes to moment magnitude (Mw). We employed ordinary and total least squares regression procedures separately to derive these relationships. The residual analyses conducted for the evaluation of these relationships showed that the expressions obtained from ordinary least squares regression procedure perform better for the conversion of other magnitude scales to Mw. The proposed equations are also compared with the other similar relationships presented in the literature. The preliminary evaluations reveal a fairly good agreement between the proposed relationships and the magnitude conversions described in the other studies. The observations made in this study suggest the reliability of the recently compiled Turkish strong-motion database for more advanced earthquake related studies.

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