Array type land time-varying gravity and gradient field observation method and system

Abstract

The invention relates to an array type land time-varying gravity and gradient field observation method and system. The method comprises the steps: setting a specific observation pillar array and a reference point, and obtaining a gravity point value, a gravity horizontal gradient and a gravity vertical gradient of each measurement point in combination with an absolute gravity measurement step, a positioning step, a relative gravity measurement step and a data processing step. According to the invention, a high-precision gravity field signal is obtained through a more efficient field comprehensive measurement mode, and a field source gravity signal of a specific spatial-temporal scale is identified more accurately.

Description

technical field [0001] The invention relates to the technical field of flow gravity observation, in particular to an observation method and system for arrayed land time-varying gravity and gradient fields. Background technique [0002] Gravity field is a basic geophysical field, its static anomaly characteristics and dynamic time variation can provide important physical field information for studying the structure and properties of deep crust. Modern scientific research believes that geodynamic processes such as earthquakes, groundwater, volcanic activities, various tectonic movements, and vertical crustal deformation will all cause changes in the earth's gravity field to a certain extent. The sensitivity of the gravitational field to mass motion or change signals makes it suitable for quantitatively studying the spatiotemporal properties of various Earth system processes and is an important data indicator. [0003] In order to determine gravity values ​​and continuously mo...

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Problems solved by technology

Absolute gravity measurement has strong reliability and high precision, but due to the expensive measurement equipment and the harsh observation conditions required, control measurement can only be carried out at a few base points in the gravity measurement network (the ratio of absolute gravity points is less than 1:40);

[0006] 2. The gravity vertical gradient measurement is only used as an auxiliary measurement item to reduce the absolute gravity measurement value to the ground value, and the gravity vertical gradient has not played its due role in field source inversion;

[0007] 3. The mobile gravity measurement network is mainly based on relative gravity observation, and the distance between measurement points is uneven

Limited by the number of absolute gravity equipment and the coverage of measuring points, the effects of instrument drift, grid value coefficient, measurement error, and environmental interference cannot be fully deducted, which affects data accuracy and reliability, thereby limiting the application of data results;

[0009] 5. The time of absolute observation and relative observation is not synchronized, which greatly affects the subsequent data adjustment; the measurement units of absolute measurement and relative measurement are different, and it is difficult to coordinate and synchronize, so that absolute control and relative joint measurement exist in gravity adjustment The influence of time asynchrony reduces the accuracy of the measurement data and seriously affects the validity of the measurement data;

[0010] 6. The relative gravity measurement points are limited by natural conditions and the closing time limit of the measurement line. Most of the measurement points are distributed around the highway with convenient transportation, and the environmental factors are complex

The observation time of a single measuring point is limited and the measurement items are single, so it is only used for gravity joint measurement

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