Pamela Jessica C. Roque, Renante R. Violanda, Christopher C. Bernido, Janneli Lea A. Soria
Around 90 % of the world's earthquakes occur at the Pacific Ring of Fire exposing the countries in this region to high risk of earthquake hazards. We model fluctuations of the different seismic magnitudes, interevent distances, and seismic depths as a function of earthquake occurrence from catalogs of Chile, Mexico, Japan, New Zealand, Philippines, and Southern California as a stochastic process with memory. We show that these fluctuations are governed by a single memory function that is described by a memory parameter μ and a decay parameter β. The values of μ exhibit an underlying characteristic memory behavior of seismic activities common to all the countries considered, while the values of β suggest a regional dependence which could be a manifestation of different seismic dynamics in various regions. This new perspective may provide a more versatile approach in studying the independent datasets that may be extracted from various earthquake catalogs. © 2024 Elsevier B.V.
Department of Physics, University of San Carlos, Talamban, Cebu City, 6000, Philippines; Research Center for Theoretical Physics, Central Visayan Institute Foundation, Jagna Bohol, 6308, Philippines; JAZC Marine Sciences Laboratory, Central Visayan Institute Foundation, Jagna Bohol, 6308, Philippines
