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DBT98-2024: Specifications for absolute gravity measurement
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DBT98-2024: Specifications for absolute gravity measurement

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ICS 91.120.25 CCSP15 Earthquake Industry Standard of the People's Republic of China Absolute gravity measurement specifications Released on 2024-03-01 2024-09-01 Implementation China Earthquake Administration released

Table of Contents

Preface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Measurement point design 2 5 Measurement point construction 3 6 Measurement point observation 4 7 Data Archive 9 Appendix A (Normative) Notes on the selection of absolute gravity measurement points 11 Appendix B (Normative) Gravity benchmark stone and marking specifications 12 Appendix C (normative) Absolute gravity measurement points 15 Appendix D (Normative) Observation Pier Entrustment and Custody 16 Appendix E (Normative) Absolute Gravity Determination Observation Procedure 18 Appendix F (Normative) Absolute Gravimeter Observation Record Sheet 20 Appendix G (Normative) Mathematical Models for Corrections in Absolute Gravity Determination 22 Appendix H (Normative) Absolute gravity measurement point locations and environmental conditions table 25 Appendix I (Informative) Summary of Absolute Gravity Results 26 Reference 27

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the China Earthquake Administration. This document is under the jurisdiction of the Technical Committee for Earthquake Monitoring and Forecasting Standardization. This document was drafted by. Hubei Provincial Seismological Bureau, China Earthquake Networks Center, Institute of Geophysics, China Earthquake Administration, Monitoring Center, First Monitoring Center of China Earthquake Administration. The main drafters of this document are. Zhang Xinlin, Hu Minzhang, Li Hui, Shen Chongyang, Xing Lelin, Chen Shi, Zhu Yiqing, Han Yufei, Wang Jiapei, Lu Hongyan, Xu Weimin, Wang Tongqing, Li Zhongya, Wang Fan, Zhang Minghui, Wang Jian, Xiao Chi.

Introduction

Absolute gravity measurement is the technology, method and corresponding work of using absolute gravity instruments to observe and obtain the absolute gravity value at the observation point. The role of absolute gravity measurement is mainly manifested in two aspects. first, the absolute gravity value can provide a control benchmark for the gravity measurement network; second, it can be repeated. Absolute gravity measurement can monitor the dynamic changes of the gravity field and provide a scientific basis for earthquake monitoring and prediction, environmental and disaster monitoring, etc. According to the China Digital Earthquake Observation Network, China Crustal Movement Observation Network, China Continental Tectonic Environment Monitoring Network, North China Strong Earthquake Tracking and Monitoring Network, It is formulated based on the practical experience of projects such as the comprehensive geophysical field observation in mainland China and the latest research results. Absolute gravity measurement specifications

1 Scope

This document specifies the technical requirements for measurement point design, construction, observation and data archiving for absolute gravity measurement. This document is applicable to absolute gravity measurement and can also be used as a reference for other industries or scientific research.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. DB/T 23 Technical requirements for seismic observation instruments to be connected to the network Gravity meter

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Gravity datum point A high-precision absolute gravimeter is used to measure the gravity value, which is used as the starting reference and control point of the gravity network. [Source. GB/T 20256-2019, 3.1] 3.2 basic gravity point basicgravitypoint Control points determined by absolute gravity measurement or relative gravity measurement. [Source. GB/T 20256-2019, 3.3, modified] 3.3 An absolute gravity observation point near a continuous gravity observation point. 3.4 Absolutegravitypoint The measuring points which have been selected to meet the requirements of relevant technical standards and are equipped with gravity observation marks can be used for absolute gravity measurement. [Source. DB/T 39-2010, 3.7] Note. Absolute gravity measurement points include gravity reference points, gravity basic points and gravity juxtaposition points. 3.5 Absolutegravimeter An instrument used to directly determine the absolute value of gravity. [Source. DB/T 23-2007, 3.1, modified] Note. Absolute gravimeters are divided into laser interferometer and atom interferometer types. Laser interferometer types are further divided into single-frequency and dual-frequency laser interferometer types. 3.6 Segment difference In gravity measurement, the difference in gravity between two adjacent points. ...