华北地区强震活动状态研究

doi:10.12196/j.issn.1000-3274.2020.02.001

Abstract

Abstract: Historic strong earthquakes occurred frequently in North China, while the earthquakes with M_S≥6.0 has been quiet for nearly 22 years since the 1998 Zhangbei M_S6.2 earthquake. Scholars are very concerned about the activity trend of strong earthquakes and there are different views. This paper discusses the rhythmic characteristics of active and quiet periods of earthquakes with M_S≥6.0, applies the technique of Morlet wavelet transform to quantitatively analyze the seismicity periodicities, and compares the seismicity features and duration time of the transition section from the active to quiescent period. It is studied that the spatial distribution of earthquakes in active periods, the comparison of strain release rates in active period, quiet period and quiet episode, statistical characteristics of the quiet episode duration time, the currently remarkable seismic quiescence of M_S≥5.0 earthquakes, and regional seismicity features of M_S≥5.0 earthquakes before the earthquakes with M_S6.0~6.9 and with M_S≥7.0 in North China. It is believed that the present situation is in the transition section or has been entered the quiet period.

Key words: Strong earthquakes, Active period, Quiet period: Active episode, Quiet episode, Transition section, Strain release rate, North China

CLC Number:

P315.7

XUE Yan, JIANG Xiang-hua, LIU Gui-ping. Active State and Trend on Strong Earthquakes in North China[J]. EARTHQUAKE, 2020, 40(2): 1-17.

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Active State and Trend on Strong Earthquakes in North China

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