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Gravity anomalies identified fault lineament on signal theory and application

Author: PanYu
Tutor: WangWanYin
School: Chang'an University
Course: Earth Exploration and Information Technology
Keywords: Gravity anomaly lineament signal Horizontal gradient of gravity anomalies Fracture
CLC: P542.3
Type: Master's thesis
Year: 2005
Downloads: 183
Quote: 2
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Abstract


The purpose of this paper is to use gravity anomaly signal for fault lineaments identified. Its main task is to study various fracture model fracture location and gravity anomaly lineaments signal maxima corresponding relationship between the position. This paper proposes a method of dividing fracture, namely gravity anomaly lineaments signal method. The so-called gravity lineament signal level is the total gravity anomaly gradient along the direction of gravity, and the first derivative is greater than zero, the value of that part. Here the model of two-dimensional and three-dimensional fracture fracture models were carried forward. Forward fracture model through the abnormal phenomena summarized. In the vertical and inclined fracture model, if the width of fracture is large enough, then the gravity anomaly lineaments signal maxima position and vertical position of the fracture line; gravity anomaly lineaments signal maxima position than gravity gradient maxima abnormal levels of total position closer to the top position on the inclined fracture, the fracture surface and located within the inclined. If the fracture width is relatively small when the gravity anomaly lineament signal maxima position and vertical position of the fracture will be bias, but this bias is still a gravity gradient abnormal levels of total and vertical position of maximum deviation between the fracture location to be small. In combination fracture model, if the combination of fracture inclination and the same distance between them, then gravity anomaly signal method than gravity lineament abnormal levels of total gradient method makes it easier to separate the two combined fracture location. Gravity anomaly lineament signal maxima contours range on both sides of the proportion of abnormal levels of total gradient force maxima contours of both sides is narrower. Gravity anomaly lineament shallow layer signal method divided fracture fracture model applications better position, and in the deep layer fracture model application results relative to badly. Characteristics of the actual use of these data to identify and explain fracture. The main findings are: 1. On the basis of previous research results presented gravity lineament signal method, making it easier to identify the fracture. 2 summarizes the two-dimensional and three-dimensional fracture model fracture model gravity anomaly lineaments signal maxima position and the correspondence between the fracture location, and with the total level of gravity anomalies identified on the fracture gradient method were compared. 3 forward the theoretical model and the actual data interpretation and fracture fracture identification have achieved good results.

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CLC: > Astronomy,Earth Sciences > Geology > Structural Geology > Tectonic movement > Line is constructed , faulting
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