Research on the Seismic Strain Field Before Earthquake Above Ms7, CHINESE Mainland
Earth Sciences
Volume 8, Issue 1, February 2019, Pages: 10-19
Received: Dec. 12, 2018; Accepted: Dec. 27, 2018; Published: Jan. 30, 2019
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Authors
Guofu Luo, Earthquake Administration of Ningxia Hui Autonomous Region, Yinchuan, China
Zhongwang Liu, Earthquake Administration of Ningxia Hui Autonomous Region, Yinchuan, China
Fenghe Ding, Earthquake Administration of Ningxia Hui Autonomous Region, Yinchuan, China
Heqing Ma, Earthquake Administration of Ningxia Hui Autonomous Region, Yinchuan, China
Mingzhi Yang, Earthquake Administration of Ningxia Hui Autonomous Region, Yinchuan, China
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Abstract
In the paper, seismic strain field is considered as a variable of seismic activity. The strain field is calculated before the earthquake above Ms7 in mainland China since 1980, and the abnormal change of time factor is extracted before the earthquake, by means of the natural orthogonal function expansion method. The results show that the time factor before the large earthquake will change suddenly, jump or jump down on stationary background. At least 3 typical fields will appear abnormal changes in the first 4 ones of seismic strain field before the earthquake, having the characteristics of multi-component display anomalies. The earliest time of abnormal occurrence is about 3 years before the earthquake. Moreover, there are some short-term time factor anomalies before some earthquakes. Through case studies the results of case studies show that the time factor anomaly extracted by strain field is more unique than seismic energy field in analyzing the anomaly of seismic activity. The difference between strain field and energy field is also discussed.
Keywords
Chinese Mainland, Seismic Strain Field, Seismic Energy Field, Natural Orthogonal Function Expansion Method, Time Factor
To cite this article
Guofu Luo, Zhongwang Liu, Fenghe Ding, Heqing Ma, Mingzhi Yang, Research on the Seismic Strain Field Before Earthquake Above Ms7, CHINESE Mainland, Earth Sciences. Vol. 8, No. 1, 2019, pp. 10-19. doi: 10.11648/j.earth.20190801.12
Copyright
Copyright © 2019 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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