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Introduction to the Operation and Management in Geomagnetic Network of China |
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Zhao X.(1), Zhang S.(1), He Y.(1), Li Q.(1) |
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(1)Institute of Geophysics, China Earthquake Administration, Beijing, China |
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There is a long history in Chinese geomagnetic observatory, which could be from the first station founded in Shanghai, 1847. Nowadays, the Geomagnetic Network of China is consisted of three-class networks corresponding to standard network, basic network and regional network. There are about 43 standard stations, 95 basic stations and 28 regional stations respectively. All the geomagnetic observatories are digital stations. The purpose of standard network is to monitor the large scale character of the geomagnetic field in China. The distance between stations is about 600 km. These stations supply data for analyzing the background information, studying the main geomagnetic field and the lithospheric field. The standard stations equip with absolute observation system and relative observation system. The absolute observation system mainly includes fluxgate theodolite and total intensity magnetometer. The relative observation system includes fluxgate magnetometer or proton magnetometer. The purpose of basic network is to monitor the temporal variation of the geomagnetic field. The distance between stations is about 200 km. These stations supply data for analyzing the geomagnetic field which period less than 1 day. All these basic stations only equip with relative observation system. The purpose of regional network is mainly to monitor the variation of geomagnetic field caused by earthquake. All these regional stations only equip with relative observation system and are located in the earthquake danger area for several years. A large, distributed database was established consisting of four levels information nodes: observatories, local earthquake administrations (LEAs), the China Earthquake Network Center (CENC), and the Geomagnetic Network Center (GNC). The observation data are first transmitted from the observatories to the LEA, then to the CENC, and ultimately to the GNC. The final data collected by the GNC include the raw data, preprocessing data, log, product data, etc., from 2007 onward. Observatory data are supplied for distribution within 48 hours of acquisition. The GNC is responsible for the quality control and distribution of observatory data. |
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Observatories |
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poster |
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