| The Northeast China is the contact part of the Eurasian plate and Pacific plate,richmineral resources,further study of the tectonic characteristics of the Northeast is conducive tolooking for undiscovered and the deep mineral resources. Simultaneously,the analysis of thegeological structure characteristics of the Northeast、the tectonic movement of the continentalplate and geological disaster forecast and so on has significance in guiding. There are so manymethodology about the regional tectonic characteristics,the data indicate that the research ofthe regional gravity and aeromagnetic data having the estensive features for the regionaltectonic characteristics analysis and research. Therefore,the use of regional gravity andaeromagnetic data tectonics is an effective method.There are so many ways of the Regional gravity and aeromagnetic data processing, Suchas:①the regional field and the local separation problems: regional field representative ofthe deep, large-scale structural characteristics, the local field representative of superficial,small-scale tectonic features.②the underground geological boundary identification problem:due to geological burial depth of the detection signal is weak, you need to study how toreasonable transform the weak anomalies, in order to reflect the deep geologic bodies’position, and achieve the purpose of determining the boundaries of the undergroundgeological body. In response to these issues, the This paper mainly studies the following:1, Firstly based on the geology in the northeast of China established a theoretical model,using the wavelet multi-scale analysis methods and techniques on the theoretical model thedifferent stages of separation and contrast, and after the separation approximation results anddetails of the results and the relationship of the order made the analysis、 inductive、summarizes. The model wavelet transform in the5to6bands effects the best, and what hasbeen done basically consistent to the regional field and local field, and become moreprominent the deep and superficial geological structure characteristics. Instructions thewavelet multi-scale analysis of the results can not only be more fully the regional field andlocal field separated, better preservation of the deep structural feature,but aslo thecorresponding order of the details results can reflect the corresponding depth of thehigh-frequency information.2, Position field boundary recognition mrthods are The Vertical Derivative、The TotalHorizontal Derivative、The Analytical Signal Amplitude、The Tilt Angle and The Theta MapEtc. The data indicate that these methods have the weak signal extraction,could get moregeological information. This article analyzed with all of these approaches basic theory, using the MATLAB language computer programming, made a lot of the theoretical model testings,according to the calculations, the comparative analysis various methods of the applicationregularity、applied effectiveness and the scope of application, summarizes the advantages anddisadvantages of each method, provide a reference to use these methods for futuregenerations.3, The wavelet multi-scale transformation method and the boundary of the potential fieldidentification methods used in the processing of the gravity and magnetic data of theNortheast:①Use the1-order and2-order wavelet approximation result to a better separationof the regional courts and the local field；Use the1-order and2-order Vertical Derivative、TheTotal Horizontal Derivative、The Analytical Signal Amplitude have been deal with theNortheast gravity and magnetic data were processed,, basically consistent with ourpredecessors results,More accurate divided of the major faults or tectonic boundary of theNortheast, better reflect the the tectonics distribution characteristics of the Northeast, illustratethese methods could provide more evidence and information for looking faults or tectonicboundary. |
PDF Full Text Request