Superimposed Decomposition of Wavelet Analysis for Seismological Investigations: Validation on GPS Stations Displacements in Central Alaska (2008-2012)

Abbas Abedini¹, Milad Moradi^1, and Homayoon Zahmatkesh¹

¹School of Surveying and Geospatial Engineering, College of Engineering, University of Tehran, North-Kargar Avenue, Tehran, Iran

Cite this paper

Abbas Abedini, Milad Moradi and Homayoon Zahmatkesh. Superimposed Decomposition of Wavelet Analysis for Seismological Investigations: Validation on GPS Stations Displacements in Central Alaska (2008-2012). Journal of Geosciences and Geomatics. 2017; 5(3):147-166. doi: 10.12691/JGG-5-3-6

Abstract

The comprehensive study of seismic waves is very important in order to understand the complex dynamic processes of the Earth’s interior as well as its signals emerged to the physical surface. In the last three decades, observational Global Positing System (GPS) products through determining the displacements of ground GPS station in horizontal and vertical directions have widely been applied to infer the tectonic stress regimes generated by the subsurface processes ranging from the local fault systems to the huge tectonic plate movements. However, the complex patterns generated during such movements are not always easy to interpret. Therefore, it is necessary to develop new approaches by modifying the previous strategies and improve the current methodologies to understand better such sudden crustal movements. In this paper, we employed 5 years GPS stations displacements data from January 1, 2008 to December 31, 2012 in the seismically active central Alaska area, in order to get the average daily and annual velocities of the GPS stations. Then, vector summation for horizontal and vertical velocities has been applied to yield the total velocities of GPS stations displacements. Moreover, we applied the Cross-Correlation Functions (CCFs) analysis to recognize the significant and homogenous displacements among the total displacements of GPS stations located in this region to be employed in next step for the superimposed decomposition of wavelet analysis at level number 1 and 2. Finally, the normal probability histograms related to the accuracy of each analysis are calculated and presented in details. The results show a very good agreement between the CCFs reorganizations, proposed wavelet decomposition methodology, and simultaneous earthquakes regimes occurred in central Alaska from 2008 to 2012 year.

Keywords

wavelet analysis, earthquake, central Alaska, cross-correlation function, superimposed decomposition

Copyright

This work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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