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Open AccessArticle

Seismo-Deformation Anomalies Associated with the M6.1 Ludian Earthquake on August 3, 2014

1
State Key Laboratory of Geological Processes and Mineral Resources, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
2
Key Laboratory of Earthquake Forecasting, Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China
3
Department of Earth and Environmental Sciences, National Chung Cheng University, Minsyong, Chiayi County 62102, Taiwan
4
Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518055, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(7), 1067; https://doi.org/10.3390/rs12071067
Received: 2 March 2020 / Revised: 16 March 2020 / Accepted: 24 March 2020 / Published: 26 March 2020
(This article belongs to the Special Issue GNSS Seismology)
A time-frequency method retrieving the acceleration changes in the terminal stage of the
M6.1 Ludian earthquake in China is discussed in this article. The non-linear, non-stationary
seismo-demformation was obtained by using the Hilbert–Huang transform and followed by a
band-pass filter. We found that the temporal evolution of the residual GNSS-derived orientation
exhibits a unique disorder-alignment-disorder sequence days before the earthquake which
corresponds well with the four stages of an earthquake: elastic strain buildup, crack developments,
deformation, and the terminal stage of material failure. The disordering orientations are gradually
aligned with a common direction a few days before the terminal stage. This common direction is
consistent with the most compressive axis derived from the seismological method. In addition, the
region of the stress accumulation, as identified by the size of the disordered orientation, is
generally consistent with the earthquake preparation zones estimated by using numerical models. View Full-Text
Keywords: A time-frequency method retrieving the acceleration changes in the terminal stage of the M6.1 Ludian earthquake in China is discussed in this article. The non-linear, non-stationary seismo-demformation was obtained by using the Hilbert–Huang transform and followed by a band-pass filter. We found that the temporal evolution of the residual GNSS-derived orientation exhibits a unique disorder-alignment-disorder sequence days before the earthquake which corresponds well with the four stages of an earthquake: elastic strain buildup, crack developments, deformation, and the terminal stage of material failure. The disordering orientations are gradually aligned with a common direction a few days before the terminal stage. This common direction is consistent with the most compressive axis derived from the seismological method. In addition, the region of the stress accumulation, as identified by the size of the disordered orientation, is generally consistent with the earthquake preparation zones estimated by using numerical models. A time-frequency method retrieving the acceleration changes in the terminal stage of the M6.1 Ludian earthquake in China is discussed in this article. The non-linear, non-stationary seismo-demformation was obtained by using the Hilbert–Huang transform and followed by a band-pass filter. We found that the temporal evolution of the residual GNSS-derived orientation exhibits a unique disorder-alignment-disorder sequence days before the earthquake which corresponds well with the four stages of an earthquake: elastic strain buildup, crack developments, deformation, and the terminal stage of material failure. The disordering orientations are gradually aligned with a common direction a few days before the terminal stage. This common direction is consistent with the most compressive axis derived from the seismological method. In addition, the region of the stress accumulation, as identified by the size of the disordered orientation, is generally consistent with the earthquake preparation zones estimated by using numerical models.
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MDPI and ACS Style

Chen, C.-H.; Su, X.; Cheng, K.-C.; Meng, G.; Wen, S.; Han, P. Seismo-Deformation Anomalies Associated with the M6.1 Ludian Earthquake on August 3, 2014. Remote Sens. 2020, 12, 1067.

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