1·Theory, observation and application of the geomagnetic polarity reversal and secular variation, magnetostratigraphy;
地磁场倒转和长期变的理论、观测和应用以及磁性地层学；
2·According to observation data at geomagnetic stations in Hebei Province from 1986 to 2005, we sum up and analyze the laws of the geomagnetic secular variation in this paper.
利用河北省地磁台1986 ~ 2005年的地磁观测资料，对该地区地磁场长期变化规律进行总结分析。
3·With geomagnetic field model records, several kinds of secular variation of geomagnetic dipole moment and the position of the geomagnetic North Pole during the year 0 ~ 2000 a.
利用地磁场模型资料，计算和分析了公元0 ~ 2000年的地磁场偶极子磁矩和地磁北极位置的长期变化。
4·According to the observation data at Guangzhou geomagnetic observatory from 1958 to 1995, we summarize the laws of the geomagnetic secular variation in Guangzhou geomagnetic observatory.
本文利用1958 ~ 1995年已正式出版的《地磁观测报告》资料对广州地磁台地磁场的长期变化进行分析研究。
5·The temporal variation of it has secular change, seasonal variation, irregular variation, and other scales variation.
重力场的时变有长期变化、季节性变化、不规则变化和其他多尺度的变化。
6·No anomalous local secular geomagnetic variation has been found in the area.
测区内未发现有局部地磁长期变化异常。