STATISTICAL SIGNIFICANCE OF CREEPEX VARIATION IN RELATION TO TYPES OF TECTONIC FEATURES AND EARTHQUAKE SOURCE MECHANISMA. N. Kaverina and A. G. Prozorov
Creepex, which is the difference between $M_s$ and the orthogonal regression of $M_s$ on $m_b$, is used as a spectral characteristic of seismic sources. Creepex precision is estimated from U.S. Geological Survey Earthquake Data Report data. The difference between the source spectra for subduction and spreading zones is shown to be statistically significant by using A. M. Dziewonski's centroid-moment tensor catalog. The spectra are also different for two continuous zones with different spreading rates. Creepex behavior is studied in relation to a source mechanism parameter (plunge of the null axis) for spreading and subduction zones.