Preprints
https://doi.org/10.5194/egusphere-2022-926
https://doi.org/10.5194/egusphere-2022-926
 
20 Sep 2022
20 Sep 2022
Status: this preprint is open for discussion.

Screening and rooting the multiple anomalies of Nepal earthquake sequence in 2015 with DTS criterion and homologous LCAI-coupling physics

Lixin Wu1,2, Yuan Qi1,2, Wenfei Mao1,2, Jingchen Lu1,2, Yifan Ding1,2, Boqi Peng1,2, and Busheng Xie1,2 Lixin Wu et al.
  • 1School of Geosciences and Info-Physics, Central South University, Changsha, 410083, China
  • 2Laboratory of Geo-Hazards Perception, Cognition and Predication, Central South University, Changsha, China

Abstract. The continuously increasing of earth observations benefits geosciences and seismicity study, but increases greatly the difficulties in understanding and discriminating multiple source data. Although the Lithosphere-Coversphere-Atmosphere-Ionosphere (LCAI) coupling paradigm and the Deviation-Time-Space (DTS) criterion were presented for better searching for and understanding the potential seismic anomalies from multiple observations, the strict consistency of spatio-temporal characteristics and homologous physics of multiple-parameter seismic anomalies has not been investigated sufficiently. With the 2015 Nepal earthquake sequence being a typical case, the reported multi-parameter anomalies were systematically reviewed, and their space-time characteristics were summarized thoroughly in this study. Numerical simulation with refined geological structures in three-dimensional space revealed the inhomogeneous crustal stress field alternation (CSFA) along the faults and around the hypocentres of 2015 Nepal earthquake sequence, which is expected to be the root of the seismic anomalies. The stress-activated positive charge carriers would have given rise to different responses near the ground surface (coversphere), including the microwave dielectric reduction, the additional infrared radiation, and the atmospheric ionization, which subsequently affected the physical properties of atmosphere and ionosphere and resulted in abnormal phenomena therein. Based on the DTS criterion and LCAI coupling paradigm, the seismic anomalies of 2015 Nepal earthquakes were screened strictly, and the screened-out anomalies were rooted carefully to the regional CSFA as well as its local blocking. Therefore, an integrated LCAI coupling framework with strict space-time correspondence and homologous physics in CSFA was proposed for the 2015 Nepal earthquake sequence. This research provides a definite philosophy as well as a practical solution for screening out the rootable seismic anomalies from multi-parameter observations of earthquake, which is of scientific meanings for searching earthquake precursor and reaching earthquake prediction.

Lixin Wu et al.

Status: open (until 01 Nov 2022)

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Lixin Wu et al.

Lixin Wu et al.

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Short summary
Multiple seismic anomalies were reported to be related to the 2015 Nepal earthquake. By investigating sufficiently both the space-time features and the physical models of the seismic anomalies, the coupling mechanisms of these anomalies in 3D space were revealed, and an integrated framework to strictly root the sources of various anomalies were proposed. This study provides a practical solution for screening out the reliable seismic anomalies from diversified earthquake observations.