Introduction to

the Operation and Management in Geomagnetic Network of


Zhao X.(1), Zhang S.(1), He Y.(1), Li


(1)Institute of

Geophysics, China Earthquake Administration, Beijing,



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.