Affiliation: | ABE Sumiyoshi1,2, PASTN Denisse3, MUOZ Víctor3 & SUZUKI Norikazu4 1 Department of Physical Engineering, Mie University, Mie 514-8507, Japan; 2 Institut Supérieur des Matériaux et Mécaniques Avancés, 44 F. A. Bartholdi, 72000 Le Mans, France; 3 Departamento de Física, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile; 4 College of Science and Technology, Nihon University, Chiba 274-8501, Japan |
Abstract: | The scale-free and small-world properties are studied in detail for the complex earthquake networks constructed from the seismic data sets taken from California (USA), Japan, Iran and Chile. It is found that, in all these geographical regions, both the exponent γ of the power-law connectivity distribution and the clustering coefficient C take the universal invariant values γ≈1 and C≈0.85, respectively, as the cell size, which is the scale of coarse graining needed for construction of network, becomes larger than a certain value. A possible physical interpretation is given to the emergence of such remarkable invariance. |