The moment magnitude determination for prehistorical earthquakes in the Wabash Valley seismic zone traditionally has relied on modified magnitude-bound liquefaction curves. The calibration of the moment magnitude and maximum distance to surface evidence of liquefaction curve for the central United States depended, in part, on the scaling of the 31 October 1895 earthquake as an M 6.8 event. Returning the M of the 1895 earthquake to a previously accepted value range of M 5.9 to M 6.2, and permitting the distance between the epicenter and the resulting liquefaction sites to vary, lowers the M of the prehistorical earthquakes by at least 0.6 units.
|Number of pages||5|
|Journal||Seismological Research Letters|
|State||Published - Sep 2004|
Bibliographical noteFunding Information:
Acknowledgements. – We acknowledge M. Tassinari for providing laboratory space at the Paleo Geology Center in Lidköping, J. Ahlgren, C. Anderson, P. Bengtsson, and I. Eklöf for practical help, T. Alerstam, M. Andersson, and R. Sandberg for statistical advice, P. Ahl-berg, E.N.K. Clarkson, A.T. Nielsen, and N.H. Schovsbo for suggestions and comments on the manuscript, and B. Malmgren and R.A. Reyment for helpful reviewing. Finally, we express our thanks to G. Landgren at Göteborgs Stadsteater for help with construction of the models. The study was supported by the Swedish Natural Science Research Council (NFR) and the Royal Society of Arts and Sciences in Göteborg.
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