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《Chinese Journal of Geophysics》 1998-01
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FEATURES OF THE LATE 1960'S JERK AND THE LATE 1970'S JERK AT FOUR OBSERVATORIES IN CHINA

CHEN BO-FANG (Physics Department, University of Hong Kong, Hong Kong; Institute of Geophysics,State Seismological Bureau, Beijing 100081, China)  
The external geomagnetic disturbing fields can be removed from the monthly means by the use of a deterministic approach. Using this method we analyzed the monthly means data of Guangzhou, Sheshan, Lanzhou and Beijing for determining the magnitudes of geomagnetic Jerks. The results show that step-changes do exist in the secular acceleration at the X and Y components for these observatories. However, the appearence of the Jerks at the Z component is not evident only the late 1960's Jerks can be distinginshed at the Lanzhou and Beijing observatories. Since the results in the present study are obtained by the method for removing a great part of external source influences and indicate the features of the Jerks for the region of mid-and lowlatitudes, the writer believes that these results give support to the conclusion -Jerk is of internal origin. Furthermore, the writer suggests that the late 1960's Jerk should be studied together with the late 1970's Jerk.
【CateGory Index】: P318.62
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【References】
Chinese Journal Full-text Database 3 Hits
1 Chen Bofang (Flat 3 26/F BLK B, Yee Fung Gdn, Yuen Long NT, Hong Kong, China);On the existence of the 2000 Jerk[J];Seismological and Geomagnetic Observation and Research;2006-05
2 CHEN Bo-fang (Institute of Geophysics, CSB, Beijing 100081, China);Discussion on the source problem of the geomagnetic solar cycle variations[J];South China Journal of Seismology;2001-03
3 Zhang Suqin Yang Dongmei Li Qi Zhao YongfenInstitute of Geophysics, China Earthquake Administration, Beijing 100081, China;The 1991 and 1999 Jerks in China[J];Earthquake Research in China;2008-03
【Co-references】
Chinese Journal Full-text Database 10 Hits
1 An Zhenchang(Institute of Geophysics, CAS, Beijing 100101 );GEOMAGNETIC FIELD OVER CHINA AND ADJACENT AREAS AT EPOCH 1995.0 DERIVED FROM THE SEVENTH GENERATION IGRF[J];PROGRESS IN GEOPHYSICS;1997-03
2 Wang Yuehua (Institute of Geophysics,Chinese Academy of Sciences,Beijing 100101);FEATURE OF THE GLOBAL CHANGE OF GEOMAGNETIC FIELD[J];PROGRESS IN GEOPHYSICS;1999-03
3 WANG Yue-Hua (Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100101);EXAMINATION AND EVALUATION OF INTERNATIONAL GEOMAGNETIC FIELD FOR THE SEVENTH GENERATION[J];PROGRESS IN GEOPHYSICS;2000-01
4 An Zhenchang (Institute of Geophysics CAS,Beijing 100101);GEOMAGNETIC SECULAR VARIATION OVER CHINA AND ADJACENT AREAS FOR 1995~2000 CALCULATED FROM INTERNATIONAL GEOMAGNETIC REFERENCE FIELD[J];PROGRESS IN GEOPHYSICS;1998-03
5 AN ZHEN-CHANG 1) N.M.ROTANOVA 2) 1) Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100101, China2) IZMIRAN, Russian Academy of Sciences, Moscow 142092, Russia;CALCULATIONS AND ANALYSES OF THE GEOMAGNETICFIELD MODELS FOR EAST ASIA[J];Chinese Journal of Geophysics;2002-01
6 WANG DANWEN Institute of Geophysics, China Seismological Bureau, Beijing 100081, China Lab. of Space Weather, Chinese Academy of Sciences, Beijing 100080, China;ANALYSIS OF THE INTERNATIONAL GEOMAGNETIC REFERENCE FIELD ERROR IN THE CHINA CONTINENT[J];Chinese Journal of Geophysics;2003-02
7 Chen Bofang (Flat 3 26/F BLK B, Yee Fung Gdn, Yuen Long NT, Hong Kong, China);On the existence of the 2000 Jerk[J];Seismological and Geomagnetic Observation and Research;2006-05
8 Chen Pofang,Wang Tanwen and Fan Guohua (Institute of Geophysics,China Seismological Bureau,Beijing 100081,China);Special feature of the 1991 jerk( Y ) in the Chinese region[J];SEISMOLOGICAL AND GEOMAGNETIC OBSERVATION AND RESEARCH;1999-01
9 Yang Dongmei (Institute of Geophysics, CSB,Beijing, 100081);Comments on the Development of the Observation System of Digital Geomagnetic Observatories and Applications of the Geomagnetic Observation Data[J];Recent Developments In World Seismology;2001-08
10 Wang Tanwen (Institute of Geophysics,CSB,Beijing,100081,China; Laboratory of Space and Weather,Academia Sinica,Beijing,100080,China);Application of International Geomagnetic Reference Field to the Basic Geomagnetic Researches in China[J];Recent Developments In World Seismology;2002-05
【Secondary References】
Chinese Journal Full-text Database 4 Hits
1 Chen Bofang ( Institute of Geophysics, China Seismological Bureau, Beijing 100081, China );On the solar cycle variations of the magnetic observatories in the Pacific and Oceania region[J];Seismological and Geomagnetic Observation and Research;2002-05
2 CHEN Bo-fang (Flat 3 26/F BLK B,Yee Fung Gdn,Yuen Long NT,Hong Kong,China);On the variations of the 11-year-period for the observatories in the central region of the Pacific Ocean[J];South China Journal of Seismology;2004-04
3 Zhang Suqin, Yang Dongmei, Li Qi, and Zhao Yongfen Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;The Study of Two Geomagnetic Jerks in China[J];中国地震研究(英文版);2009-02
4 Zhang Suqin Yang Dongmei Li Qi Zhao YongfenInstitute of Geophysics, China Earthquake Administration, Beijing 100081, China;The 1991 and 1999 Jerks in China[J];Earthquake Research in China;2008-03
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