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**10** 

*China*

Du Xuebin et al.\*

**Changes in Apparent Resistivity in the Late** 

In China, a large-scale observation network that is comprised of a number of apparent resistivity (for short, AR) stations has been established for the purpose of earthquake (EQ) monitoring and prediction since the 1966 Ms7.2 Xingtai EQ in Hebei Province. Presently, over 70 AR stations are in observation in seismically active belts in densely populated areas and nearby some of large, medium-sized cities. The 2008 Ms8.0 Wenchuan great EQ in Sichuan province occurred in the AR station network that was located in the border area of both Sichuan and Gansu provinces. In the 1970s-1980s, more than 110 AR stations had been in observation, and in those years, several great earthquakes (EQs) occurred nearby AR stations, such as the 1976 Ms7.8 Tangshan EQ in Hebei province, the 1976 Ms7.2 Songpan-Pingwu EQ in Sichuan province, the 1976 Ms7.4 Longling EQ in Yunnan province, and the 1988 Ms7.6 Lancang-Gengma EQ in Yunnan Province. At an AR station, two horizontally perpendicular observation channels or three channels, more one horizontally skewed channel (a NE or NW channel, as illustrated in Fig.1a), are employed, and for each channel, an AR observation configuration with a symmetry four-electrode array is installed (Fig.1b).

For most stations, the current electrode spacing AB 1000 ~ 2000m .

channel (b) at a geo-electrical station

<sup>1</sup>*Lanzhou Base of Institute of Earthquake Science, CEA, Lanzhou, China* 

3*Earthquake Administration of Beijing Municipality, Beijing, China*

<sup>2</sup>*China Earthquake Networks Center, China Earthquake Administration, Beijing, China* 

 \*

Fig. 1. The observation channels (a) and symmetric four-electrode resistivity array for a

An Zhanghui1, Yan Rui3, Ye Qing2, Fan Yingying1, Liu Jun1, Chen Junying1 and Tan Dacheng1

**1. Introduction** 

**Preparation Stages of Strong Earthquakes** 

*Lanzhou Base of Institute of Earthquake Science, CEA, Lanzhou* 

