Journal cover Journal topic
Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union

Journal metrics

  • IF value: 1.329 IF 1.329
  • IF 5-year<br/> value: 1.394 IF 5-year
  • CiteScore<br/> value: 1.27 CiteScore
  • SNIP value: 0.903 SNIP 0.903
  • SJR value: 0.709 SJR 0.709
  • IPP value: 1.455 IPP 1.455
  • h5-index value: 20 h5-index 20
Nonlin. Processes Geophys., 22, 625-632, 2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
21 Oct 2015
Earthquake source parameters that display the first digit phenomenon
P. A. Toledo1, S. R. Riquelme2, and J. A. Campos3 1Faculty of Engineering and Sciences, University Adolfo Ibáñez, Diagonal Las Torres 2640, Peñalolén, Santiago, Chile
2National Seismological Center, University of Chile, Blanco Encalada 2002, Santiago, Chile
3Departament of Geophysics, University of Chile, Blanco Encalada 2002, Santiago, Chile
Abstract. We study the main parameters of earthquakes from the perspective of the first digit phenomenon: the nonuniform probability of the lower first digit different from 0 compared to the higher ones. We found that source parameters like coseismic slip distributions at the fault and coseismic inland displacements show first digit anomaly. We also found the tsunami runups measured after the earthquake to display the phenomenon. Other parameters found to obey first digit anomaly are related to the aftershocks: we show that seismic moment liberation and seismic waiting times also display an anomaly. We explain this finding by invoking a self-organized criticality framework. We demonstrate that critically organized automata show the first digit signature and we interpret this as a possible explanation of the behavior of the studied parameters of the Tohoku earthquake.

Citation: Toledo, P. A., Riquelme, S. R., and Campos, J. A.: Earthquake source parameters that display the first digit phenomenon, Nonlin. Processes Geophys., 22, 625-632,, 2015.
Publications Copernicus