Method for removing environmental influence factors of borehole strain data

Abstract

The invention relates to a method for removing environmental influence factors of borehole strain data. Reading drill hole strain data sa component, air pressure data and water level data; decomposing the strain data into a trend term, a periodic term and a remainder term by utilizing time series decomposition; by comparing the frequency points of the earth tide, the periodic term is removed as the strain response caused by the earth tide; the remainder term is used as strain data after the earth tide is removed and is influenced by the air pressure and the water level, the remainder term, the water level data and the air pressure data are placed together, multi-channel singular spectrum analysis is carried out, and due to the fact that the air pressure and the water level are in negative correlation with the strain data, a correlation coefficient is used for identifying strain response caused by the water level and the air pressure in the remainder term and removing the strain response. The defects that environmental data are not fully utilized or the calculation process is too complex and too many parameters are introduced when environmental influence factors are removed in the past are overcome.

Description

technical field [0001] The invention belongs to the technical field of removing the environmental influence factors of borehole strain data, and particularly relates to a method for removing the environmental influence factors of borehole strain data. Background technique [0002] Earthquake is a natural disaster that is extremely harmful to social psychology. Due to the inaccessibility of the interior of the earth, the infrequent occurrence of large earthquakes, and the complexity of the physical process of earthquakes, earthquake prediction and prediction is one of the world's scientific research problems that requires long-term research and exploration. . Earthquake precursor observation is the premise of earthquake prediction. Earthquake is the process of sudden rupture of underground rock formation under concentrated stress exceeding the strength limit. In earthquake precursor research, many anomalies have been found, including lithosphere, atmosphere and ionosphere. I...

AI Technical Summary

Problems solved by technology

Since the borehole strain gauge is installed at a depth of 40-60 meters, it is inevitably affected by various factors during the observation process. These factors will cause a strain response, and the strain response caused by these factors will often annihilate the earthquake precursor. Causes interference when extracting earthquake precursors

[0003] At present, many scholars have done a lot of removal of environmental factors, but so far, the filtering and decomposition methods to remove the influence of environmental factors lack rationality verification, and Kalman filtering introduces too many parameters when calculating the response of environmental factors

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