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EARTHQUAKE ›› 2025, Vol. 45 ›› Issue (3): 168-179.doi: 10.12196/j.issn.1000-3274.2025.03.011

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Research on Taylor Polynomial Model Based on FHD Stations in Jiangsu Province

SUN Jun-song1, WU Ying-yan2, LI Hong-yu1, WANG Li1, YANG Jie1, CHEN Hua-yuan3   

  1. 1. Jiangsu Earthquake Agency, Nanjing 210004, China;
    2. Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China;
    3. Fujian Earthquake Agency, Fuzhou 350003, China
  • Received:2024-05-11 Revised:2024-12-20 Online:2025-07-31 Published:2025-10-23

Abstract: A Taylor polynomial model for Jiangsu region was established using the F, H, and Z components of 11 proton vector magnetometers (FHD). The calculation results of the model were compared with those of the IGRF13 model in the region, as well as the measured values of the proton vector magnetometer (FHD). The comparison results showed that: ① The difference between the measured values of proton vector magnetometer (FHD) stations in Jiangsu region and the IGRF13 model is between -208.27~176.74 nT, which is consistent with the global estimation accuracy of 50~300 nT of the model studied by previous researchers. ② The Taylor polynomial model constructed in Jiangsu region is generally consistent with the IGRF13 model, and the Taylor polynomial model in Jiangsu region can better highlight local geomagnetic features. ③ The accuracy of the Taylor polynomial model in the region is higher than that of the IGRF13 model. Combined with continuous observation data in the region, it can provide useful references for the construction of regional geomagnetic maps.

Key words: Taylor polynomial, IGRF13 model, Proton vector magnetometer, Regional geomagnetic map, Regional geomagnetic model

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