The basic task of geomagnetic observatory is .to produce accurate, relaible,continuous and complete observative data. The aim of examination is to judge the quality status of data. According to the operative principle...The basic task of geomagnetic observatory is .to produce accurate, relaible,continuous and complete observative data. The aim of examination is to judge the quality status of data. According to the operative principle of geomagnetic instruments and its operative status that should be achieved, geomagnetic activity and spread characteristics in time domain and location domain, authers proposed a complete set of data quality examination. The paper discusses respectively physical basement, examination method and the result about scalevalues, base-line values, monthly mean values, daily mean values, maximum and minimum values in daily range, magnetic storm and K index. The practice has proved that this set of examination is feasible and useful to raise and to guarantee the quality of observative data.展开更多
The number of good quality paleomagnetic data of the Mesoproterozoic supercontinent Nuna(e.g.Columbia,Hudsonland)has increased in recent years enabling more reliable global continental reconstructions(e.g Hoffman
The geomagnetic night-time values were used to estimate the electromagnetic response function Q1 for half-year period. If the spatial structure of the source field can be described by the approximation, one can estim...The geomagnetic night-time values were used to estimate the electromagnetic response function Q1 for half-year period. If the spatial structure of the source field can be described by the approximation, one can estimate the Q1 value using the single-station Z/H method. This technique enables us to carry out regional deep gcomagnetic sounding by the method. The data used for analyses are geomagnetic night-time values for about, typically, 26 years from 5 good-quality stations and for several years from 34 stations distributed over the globe. The results indicate that the night-time values yield more reliable response estimates for half-year period compared to the usual estimates obtained from daily means. It implies that the approximation for the night-time fields holds good for the half-year period, but the daily means are not suitable for estimating the response function of the semi-annual variations by using the single-station method. Source field analyses for daily means data and night-time means data have also been carried out in this paper.展开更多
The geomagnetic data recorded by Kashi and Jinghai observatories in China were analyzed with improved polarization method. We compared the result around 0.01 Hz which is thought to be useful to detect the ULF anomaly ...The geomagnetic data recorded by Kashi and Jinghai observatories in China were analyzed with improved polarization method. We compared the result around 0.01 Hz which is thought to be useful to detect the ULF anomaly with the result around 0.1 Hz which was inferred from the earthquake depth according to the skin effect, and found that 0.1 Hz is more proper to detect the ULF anomaly for both earthquakes studied in this paper.展开更多
文摘The basic task of geomagnetic observatory is .to produce accurate, relaible,continuous and complete observative data. The aim of examination is to judge the quality status of data. According to the operative principle of geomagnetic instruments and its operative status that should be achieved, geomagnetic activity and spread characteristics in time domain and location domain, authers proposed a complete set of data quality examination. The paper discusses respectively physical basement, examination method and the result about scalevalues, base-line values, monthly mean values, daily mean values, maximum and minimum values in daily range, magnetic storm and K index. The practice has proved that this set of examination is feasible and useful to raise and to guarantee the quality of observative data.
文摘The number of good quality paleomagnetic data of the Mesoproterozoic supercontinent Nuna(e.g.Columbia,Hudsonland)has increased in recent years enabling more reliable global continental reconstructions(e.g Hoffman
文摘The geomagnetic night-time values were used to estimate the electromagnetic response function Q1 for half-year period. If the spatial structure of the source field can be described by the approximation, one can estimate the Q1 value using the single-station Z/H method. This technique enables us to carry out regional deep gcomagnetic sounding by the method. The data used for analyses are geomagnetic night-time values for about, typically, 26 years from 5 good-quality stations and for several years from 34 stations distributed over the globe. The results indicate that the night-time values yield more reliable response estimates for half-year period compared to the usual estimates obtained from daily means. It implies that the approximation for the night-time fields holds good for the half-year period, but the daily means are not suitable for estimating the response function of the semi-annual variations by using the single-station method. Source field analyses for daily means data and night-time means data have also been carried out in this paper.
基金financially supported by the Special Project for Earthquake Research(200708033)
文摘The geomagnetic data recorded by Kashi and Jinghai observatories in China were analyzed with improved polarization method. We compared the result around 0.01 Hz which is thought to be useful to detect the ULF anomaly with the result around 0.1 Hz which was inferred from the earthquake depth according to the skin effect, and found that 0.1 Hz is more proper to detect the ULF anomaly for both earthquakes studied in this paper.
