JpGU-AGU Joint Meeting 2020

講演情報

[E] 口頭発表

セッション記号 M (領域外・複数領域) » M-IS ジョイント

[M-IS09] Interdisciplinary studies on pre-earthquake processes

コンビーナ:服部 克巳(千葉大学大学院理学研究科)、Dimitar Ouzounov(Center of Excellence in Earth Systems Modeling & Observations (CEESMO) , Schmid College of Science & Technology Chapman University, Orange, California, USA)、劉 正彦(国立中央大学太空科学研究所)、Qinghua Huang(Peking University)

[MIS09-01] Prediction of Geomagnetic Daily Variations

*Suqin Zhang1 (1.Institute of Geophysics, China Earthquake Administration)

キーワード:geomagnetic daily variation, Natural Orthogonal Method, disturbances

Since 2008, many geomagnetic observatories have been built in China. The variety and time span of observations are increasing, which has provided abundant and valuable geomagnetic data for scientific research. However, rapid urbanization and construction development has negatively affected the geomagnetic observation environment. The magnetic field observations are subject to disturbances of several nT to several hundreds nT caused by infrastructure construction, vehicles, subway and light rail, high-voltage DC power lines, factory operations and so on. It is important to identify and exclude disturbances from massive data.

In this study, we have analysed how the magnetic disturbances relate to various influencing factors mentioned above. In addition, Natural Orthogonal Method (NOC), Space Weighting Method and Long Short-Term Memory Recuttent Neural Network (LSTM RNN) are utilised to develop a geomagnetic daily variation model based on geomagnetic data obtained from 30 observatories of Geomagnetic Network of China from 2017 to 2018. We will compare the daily variations calculated by the model and those measured by the observatories. Finally, we hope the results could be used to correct the observatory data for a significant part of the disturbances.