Research On Networking Measurement System Of Electromagnetic Disturbance In Earthquake Forecast

It has been confirmed that the earthquake precursors of underground electromagnetic field are existent through the underground electronic field/current observation method and the practice of earthquake forecast for several decades. Based on the current situation of slow observation method and that information is not easy processed due to using analog single observation instrument, the thesis investigates the electromagnetic observation system of digital and successive collection and remote network transmission.Firstly, the thesis makes a theoretical analysis on the underground electromagnetic field change mechanism of earthquake anomaly, and confirms that underground electromagnetic field changes exist before earthquake, and analyzes how to forecast earthquake using electromagnetic anomaly and how to exclude interference factor. Earthquake electromagnetic disturbance observation system includes monitoring center station and single station. Several single collecting stations are distributed at different places to collect earthquake observation data from different places. Every single collecting station collects and transforms the earthquake information at its location place in real time, and transmits them to remote monitoring center via line or wireless way.The thesis mainly focuses on collecting and remote network transmission parts. In collection part, the thesis adopts measuring electrode to collect electromagnetic disturbance signal from observation location. Analog data collected by measuring electrode are amplified and filtered and AD converted through collecting board, and then transmitted to monitoring center.In network transmission part, to solve unattended operation and stations far apart in earthquake forecast observation, the thesis does research on remote data transmission method and contrasts current several transmission ways, and focuses on wireless transmission way and put forward data collecting remote transmission and network design based on GPRS. In wireless transceiver part, GPRS module is adopted, and data are transmitted to connect Internet via GPRS network. Monitoring center can be connected to Internet and receive the data collected and transmitted from remote single station through router.Electromagnetic disturbance instrument can carry out underground electromagnetic disturbance observation in real time and successive digital collection and graphic display. It realizes remote network data transmission and transmits base station data to analysis center via network, and it can display observation data of several stations simultaneously and carry out statistical analysis about them, including partitioned assembly average and maximum and gross. It can make statistical analysis on anomaly to provide foundation for earthquake forecast.