The electromagnetic spider webs will be placed in the southeast coastal seismic belt. Instrument every year to replace the battery life can reach 20 years. After the instrument is placed, each group can absorb the anomaly of the earth’s electromagnetic field about 30 square kilometers. In each device, an electronic compass with a set of magnetic anomalies is detected. Using a special timer, opening 4 times per minute, the opening time is about 5-15 seconds. We found it is abnormal after repeated scanning electric signal through the GPRS network to judge, in a few days before the earthquake can know the earthquake abnormal electromagnetic field signal strength. The focus is on the use of ten kinds of ancient China tactics, further analysis of the quake epicenter. The equipment has low cost and low power consumption, so it is a good short impending earthquake prediction method   .
Li, X.L., Zhang, L., Dong, X.N.
and Lin, M. (2016) The Data
Tracking and Analysis of Earthquake Precursor Networks in Shandong
Province. Seismological and Geomagnetic Observation and
Research, 37, 142-146.