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

Autor: Chieh-Hung Chen, Xiaoning Su, Kai-Chien Cheng, Guojie Meng, Strong Wen, Peng Han
Jazyk: angličtina
Rok vydání: 2020
Předmět:
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.
Science
Zdroj: Remote Sensing, Vol 12, Iss 7, p 1067 (2020)
Druh dokumentu: article
ISSN: 2072-4292
DOI: 10.3390/rs12071067
Popis: A time-frequency method retrieving the acceleration changes in the terminal stage of theM6.1 Ludian earthquake in China is discussed in this article. The non-linear, non-stationaryseismo-demformation was obtained by using the Hilbert−Huang transform and followed by aband-pass filter. We found that the temporal evolution of the residual GNSS-derived orientationexhibits a unique disorder-alignment-disorder sequence days before the earthquake whichcorresponds 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 graduallyaligned with a common direction a few days before the terminal stage. This common direction isconsistent with the most compressive axis derived from the seismological method. In addition, theregion of the stress accumulation, as identified by the size of the disordered orientation, isgenerally consistent with the earthquake preparation zones estimated by using numerical models.
Databáze: Directory of Open Access Journals
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