The First World Catalog of Earthquake-Rotated Objects (EROs), Part II: Statistical Analyses and Related Interpretations

摘要

The article presents the results of the quantitative statistical analyses of the first world catalog of earthquake-rotated objects (EROs), presented in Part I of the study (Cucci et al., 2016). We searched for possible relations between the epicentral distance of EROs occurrence and a number of customary seismological observables, such as magnitude, intensity, focal mechanism, etc. The reliability of results is quantitatively checked by means of some suitable statistical tests. We found strong evidence of a clear log-linear dependence of the epicentral distance, to which an ERO can be observed, on the magnitude M-w of the source event. We note that the probability of observing EROs near the epicentral area (D < 10 km) inversely decreases with the earthquake magnitude and that, for large earthquakes (M-w 8+), this probability remains significant (around 30%) beyond 100 km from the epicenter. Unexpectedly, we did not find significant relations between EROs occurrence and epicentral intensity, possibly because of high dispersion of intensity values.