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MAGNITUDE-DEPENDENT CORRECTION FOR MWP

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Author(s): Paul M. Whitmore, | Seiji Tsuboi | Barry Hirshorn | Thomas J. Sokolowski

Journal: Science of Tsunami Hazards
ISSN 8755-6839

Volume: 20;
Issue: 4;
Start page: 187;
Date: 2002;
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Keywords: moment magnitude | Mwp | tsunami | tsunamis | earthquakes | earthquake | magnitude correction

ABSTRACT
The P-wave moment magnitude, Mwp, is shown to have a magnitude-dependent bias when compared to the Harvard CMT Mw. Mwp results for 416 earthquakes are compared to the Harvard Mw. In general, Mwp is higher than the Harvard Mw for earthquakes less than magnitude 6.8 and lower for those over 6.8. Results are considered consistent enough to add a linear correction based on the initial Mwp determination. Based on a linear best fit to the data, the following correction is applied: Mwp corrected = (Mwp initial – 1.03) / 0.843.
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