Study Of Several Influence Factor Of Well Water Level Change

Underground fluids exist extensively among solid earth mediums. Underground fluids are all of the matter that can flow under subsurface. Commonly they are water, air, oil and Supercritical Fluid (SCF) and silicate melt in the deep layer. They are the important composition of crustal matter. They can flow under the grads of pressure, temperature and concentration etc. The physical and chemical properties can be actively behaved when they interact with solid earth mediums. At the same time, the underground fluids have special actions and manifestations among the crustal movement and earthquakes process. They can sensitively response to tectonic activity and earthquake process.Earthquake underground water level observations often set up on the bases of well-aquifer system. The water level changes of well-aquifer system have obvious magnification and very sensitive action to slight stress and strain. The water level changes of 1mm can probably response to 10-10 volume strain. So, the observation of water level changes can look as natural synthesis instrument which can look into crustal stress activities. To some degree, they can act as strain gauge, creep gauge and long period seismometer. Studying the relationship between well water level and stress-strain has great significance to observe crustal deformation probably caused by earthquake, to study the crustal stress-strain activities in the process of earthquake and to explore earthquake prediction investigation.Earthquake underground water level observation is a means in order to get earthquake anomaly information. But not only seismic information but also other aseismic information can also be observed in the continuing water level observation. For example, barometric pressure fluctuations can arouse the reverse changes of well water level. Atmosphere precipitation, snow and other loading action and water pumping and water injection can also arouse well water level obvious changes. So studying all kinds of influence factor of earthquake underground water level observation and knowing of their relationship have great importance to understand aquifer characteristics.This paper is based on geophysics and hydroseismology. The existing observation condition of earthquake underground fluid in China mainland was used. to analyze physical basis and all kinds of influence factor of earthquake underground water level and to study the methods of getting useful information. The relationship between water level and stress-strain was discussed. The methods of obtain medium parameters about aquifer system was explored using earthquake underground water level data. The relationship between the changes of aquifer parameters and medium strong earthquakes was discussed. This study provides preparation for know of aquifer characteristics and exploring the action of well water level changes in the process of earthquake occurring and has certain theoretical and practical significance.