C ≈ 0.85 scaling and the universal clustering structure of earthquake networks
S. Abe1 and N. Suzuki21Department of Physical Engineering, Mie University, Mie 514-8507, Japan 2College of Science and Technology, Nihon University, Chiba 274-8501, Japan
Received: 04 Jan 2014 – Accepted for review: 13 Jan 2014 – Discussion started: 04 Feb 2014
Abstract. Earthquake network describes the complexity of seismicity both qualitatively and quantitatively. The procedure of constructing an earthquake network contains as a single parameter the size of the cells, into which a geographical region under consideration is divided. Then, the characteristics of the network depend on the cell size, in general. Here, the dependency of the clustering coefficient, C, of network on the cell size is studied. Remarkably, C of the earthquake networks constructed from the seismic data taken from California, Japan, and Iran well coincide for each value of the scaled dimensionless cell size. It is found that the networks in California and Japan are three-dimensional, whereas the one in Iran is rather two-dimensional. In addition, the values of C of all these three networks monotonically converge to C ≈ 0.85 as the scaled dimensionless cell size increases, highlighting a universal aspect of the concept of earthquake network.
Abe, S. and Suzuki, N.: C ≈ 0.85 scaling and the universal clustering structure of earthquake networks, Nonlin. Processes Geophys. Discuss., 1, 39-49, doi:10.5194/npgd-1-39-2014, 2014.