Abstract
In this paper, a size-independent modification of the general detrended fluctuation analysis (DFA) method is introduced. With this modified DFA, seismic time series (m≥4.5) pertaining to most seismically active regions of the world from the year1972up to the year2016are comparatively analyzed. An eminent homogeneity of spatial clustering behaviors in worldwide range is detected and DFA scaling exponents coincide with previous results for local regions. Furthermore, universal nontrivial spatial clustering behaviors are revealed from shallow to intermediate-depth earthquakes by varying the depth of the hypocenter: in shallow earthquakes, the depth range corresponding to the minimum spatial clustering is first verified to be spatiotemporal and identical; in intermediate-depth earthquakes, strong weakening long-range correlations compared to shallow earthquakes are unveiled to strengthen the recent findings in seismology. Our work aims to suggest a possible statistical approach to explore the dynamic mechanisms implied in the seismicity as well as in other analogous dynamic evolution processes.
Highlights
Among multifarious natural hazards, seismicity is a representative complex spatiotemporal phenomenon, in which underlying mechanisms are not yet fully understood [1, 2]
We introduced a modified version of general detrended fluctuation analysis (DFA) method to demonstrate the extremely similar spatial clustering behaviors for different wide seismic regions over the world
The depth-dependent spatial clustering properties have been identified on the comparison of different catalogs
Summary
Seismicity is a representative complex spatiotemporal phenomenon, in which underlying mechanisms are not yet fully understood [1, 2]. The spatial long-range correlation can be quantified as a scaling exponent through DFA analysis on the time series of earthquake separation distance (spatial interval), whose fluctuation is obviously governed by the seismic region dimension. Such effect may lead to nonuniformity in comparative study across different regions of the world. A depthdependent spatial clustering analysis is implemented with the depth range extending from the shallow seismic region to the intermediate-depth seismic region One expects that such results may provide valuable clues on detection of the intermediate-depth earthquake mechanisms as well as help explain differences in their seismological behaviors compared to shallow earthquakes.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
