Research on the Seismic Strain Field Before Earthquake Above Ms7, CHINESE Mainland
Volume 8, Issue 1, February 2019, Pages: 10-19
Received: Dec. 12, 2018;
Accepted: Dec. 27, 2018;
Published: Jan. 30, 2019
Views 280 Downloads 50
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
Follow on us
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.
Chinese Mainland, Seismic Strain Field, Seismic Energy Field, Natural Orthogonal Function Expansion Method, Time Factor
To cite this article
Research on the Seismic Strain Field Before Earthquake Above Ms7, CHINESE Mainland, Earth Sciences.
Vol. 8, No. 1,
2019, pp. 10-19.
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.
CYRI llic, KAI Zha Kai Ei Qi.1971: Random Function Theory and Its Application in Hydrology and Meteorology. Press Seismological (in Chinese Beijing).
MA Kaiy, DING Yuguo, TU Qi.1993: Principles and Methods of Climate Statistics. Press Seismological (in Chinese Beijing).
YANG Mingzhi, ZHAO Weiming.2004: Statistical Analysis on Energy Field of Seismicity in Ningxia and Its Neighborhood Region. Acta Seismologica Sinica, 26(5): 516-522.
LUO Guofu, YANG Mingzhi.2005: Space-time Distributed Characteristics on Energy Field of Earthquake in the Yunnan Region. Earthquake Research in China, 21(3): 13-18.
LUO Guofu, TU Hongwei, MA Heqin. et. al 2011: Analysis on Energy Field of The Seismic Activity in Earthquake Hazard Area From The Northwest to The South of Yunnan. Journal of Seismological Research (in Chinese), 34(4): 285-291.
YANG Mingzhi, MA Heqin.2012: Analysis of Regional Seismic Energy Field before Wenchuan Ms8.0 Earthquake. Progress in Geophysics (in Chinese), 27(3): 0872-0877.
MA Heqin, YANG Mingzhi. 2013: Research on The Energy Field about Yushu MS7.1 Earthquake in Qinghai in 2010. Journal of Seismological Research (in Chinese) 35(4): 487-490.
YANG Mingzhi, MA Heqin. 2013: Features of Time Factor Anomalies of Regional Energy Field before Large Earthquake. Earthquake (in Chinese), 33(3): 107-115.
LUO Guofu, ZENG Xianwei, MA Heqin. et. al. 2014: Analysis of Energy Field of Seismic Activity before The Minxian-Zhangxian MS 6.6 Earthquake in China . Earthquake Engineering Journal (in Chinese), 36(2): 314-319.
MA Zhongjin, Fu Zhengxiang.1990: Study on Earthquake Prediction in China.//Observation and Physical Basis of Medium Term Earthquake Prediction. Press Seismological (in Chinese Beijing).
MEI Shirong. 1997: General Characteristics of Long Term Evolution of Seismicity before Strong Earthquakes in North China.//Theory and Method of Short Impending Earthquake Prediction. Press Seismological (in Chinese Beijing).