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Migration of Earth Surface Deformation as a Large Earthquake Trigger

  • Vladimir KaftanEmail author
  • Andrey Melnikov
Conference paper
Part of the Springer Proceedings in Earth and Environmental Sciences book series (SPEES)

Abstract

The evolution of the horizontal deformations of the Earth’s surface in the San Francisco region on a ten-year interval with a daily time resolution is investigated. The deformations of the total shear obtained from the data of permanent GPS observations are analyzed. The initial data are the time series of coordinate changes published by the Nevada Geodetic Laboratory of the University of Nevada, Reno. The evolution of the Earth’s surface deformations is tracked using kinematic visualizations that demonstrate the change of the deformation field over time. The created animations make it possible to monitor the qualitative nature of the deformation in connection with the seismic process evolvement and fault tectonics. The region under study in recent years has been the subject of special attention due to possible occurrence of a strong earthquake. The visualization of the deformation process demonstrated the zones of activation and the propagation path of the deformation fronts. It is shown that the propagation of shear deformation, initiated from the epicenters of duplicate moderate earthquakes, migrates to the Napa Fault and provokes a major earthquake. This phenomenon is regarded by the authors as a trigger for a seismic event. It is concluded that the Hayward Fault Zone is currently less seismically active as the most mobile one.

Keywords

Deformation waves Deformation migration Earthquake trigger GPS San Francisco Bay 

Notes

Acknowledgements

This work was conducted in the framework of budgetary funding of the Geophysical Center of RAS, adopted by the Ministry of Science and Higher Education of the Russian Federation.

Supplementary material

Supplementary material 1 (MP4 9748 kb)

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.The Geophysical Center of the Russian Academy of SciencesMoscowRussia
  2. 2.Peoples’ Friendship University of RussiaMoscowRussia

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