27 Jun 2022
27 Jun 2022
Status: this preprint is currently under review for the journal ESSD.

Rescue and quality control of historical geomagnetic measurement at SheShan Observatory, China

Suqin Zhang1, Changhua Fu1, Jianjun Wang2, Guohao Zhu3, and Chuanhua Chen4 Suqin Zhang et al.
  • 1Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China
  • 2Earthquake Administration of Gansu Province, Lanzhou, 730000, China
  • 3Shanghai Earthquake Agency, Shanghai, 200062, China
  • 4Earthquake Administration of Shangdong Province, Jinan, 250014, China

Abstract. The Sheshan geomagnetic observatory (IAGA code SSH), China was built in Xujiahui, Shanghai in 1874 and moved to Sheshan, Shanghai at the end of 1932. So far, SSH has a history of nearly 150 years. It is one of the earliest geomagnetic observatory in China and one of the geomagnetic stations with the longest history in the world.In this paper, we present the rescue and quality control of the historical data at Sheshan observatory (SSH) from 1933 to 2019. The rescued data are the absolute hourly mean values of D, H and Z components. Some of these data are paper-based records, and some are stored in a floppy disk in BAS, DBF, ACCESS and other file formats. After digitization and format transformation, we imported the data into the Toad database to achieve the unified data management. We performed statistics of continuity rate, visual analysis, outliers detects and data correction on the stored data. Then we conducted the consistency test of daily variation and secular variation by comparing the corrected data with these of the reference observatory data, and the computational data of the COV-OBS model, respectively. The consistency test revealed fairly good agreement. However, the individual data should be used with caution, because these data are suspicious values, but there is not any explanation or change registered in the available metadata and logbooks. Finally we present an example of the datasets in discriminating geomagnetic jerks. The digitized and quality-controlled AHMVs data are available at: (Zhang et al, 2022).

Suqin Zhang et al.

Status: open (until 22 Aug 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on essd-2022-203', Xin Changjiang, 05 Jul 2022 reply
    • AC1: 'Reply on CC1', Suqin Zhang, 07 Jul 2022 reply
    • AC2: 'Reply on CC1', Suqin Zhang, 07 Jul 2022 reply
  • CC2: 'Comment on essd-2022-203', Xiuyi Yao, 07 Jul 2022 reply
    • AC3: 'Reply on CC2', Suqin Zhang, 16 Jul 2022 reply
  • RC1: 'Comment on essd-2022-203', Anonymous Referee #1, 10 Jul 2022 reply
    • AC4: 'Reply on RC1', Suqin Zhang, 16 Jul 2022 reply
  • RC2: 'Comment on essd-2022-203', Anonymous Referee #2, 15 Jul 2022 reply
    • AC5: 'Reply on RC2', Suqin Zhang, 16 Jul 2022 reply

Suqin Zhang et al.

Data sets

Quality-controlled geomagnetic hourly mean values datasets of Sheshan observatory from 1933 to 2019 Zhang Suqin; Zhu Guohao; Wang Jianjun; Chen Chuanhua

Suqin Zhang et al.


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Short summary
The Sheshan observatory has nearly 150 years of observation history, and its observation data have important scientific value. However, as time goes by, these precious historical data face the risk of damage and loss. We have carried out a series of rescue work on the historical data of Sheshan observatory. A new historical datasets were released, including the quality-controlled absolute hourly mean values of three components (D, H and Z) from 1933–2019.