Magnitude Problems in Historical Earthquake Catalogues and Their Impact on Seismic Hazard Assessment
Rong, Yufang, Mehrdad Mahdyiar, Bingming Shen-Tu, and Khosrow Shabestari 2011, "Magnitude Problems in Historical Earthquake Catalogues and Their Impact on Seismic Hazard Assessment," Geophysical Journal International, doi:10.1111/j.1365-246X.2011.05226.x.
Abstract available at http://onlinelibrary.wiley.com/doi/10.1111/j.1365-246X.2011.05226.x/abstract