GB/T 41520-2022 English PDF

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GB/T 41520-2022: Specification for active sources ocean bottom seismograph investigation
Status: Valid

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Basic data

Standard ID: GB/T 41520-2022 (GB/T41520-2022)
Description (Translated English): Specification for active sources ocean bottom seismograph investigation
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A45
Word Count Estimation: 13,168
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 41520-2022: Specification for active sources ocean bottom seismograph investigation

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Specification for active sources ocean bottom seismograph investigation ICS 07.060 CCSA45 National Standards of People's Republic of China Technical specification for active source seafloor seismograph survey Published on 2022-04-15 2022-11-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration directory Preface I 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 General Requirements 2 4.1 Space-time benchmark 2 4.2 Technical requirements for the survey2 4.3 Layout of survey stations and survey lines 2 5 Survey equipment technical indicators 2 5.1 General Specifications 2 5.2 Recorder Specifications 3 5.3 Hypocenter technical index 3 6 Marine Exploration 3 6.1 OBS Preparation Requirements 3 6.2 Preparation of relevant documents 3 6.3 OBS parameter setting 3 6.4 Blocking the ball 4 6.5 Delivery and recycling of OBS4 6.6 Navigational requirements4 6.7 Timing Positioning Technology 4 6.8 Homework class report 5 7 Acceptance of offshore work documents 5 7.1 Acceptance of raw data 5 7.2 Drawing acceptance 5 7.3 Document acceptance5 8 Data processing and interpretation 5 8.1 Basic data collection and arrangement 5 8.2 Data processing requirements5 8.3 Inversion Interpretation 6 9 Findings 6 9.1 Results Report 6 9.2 Documentation 6 Appendix A (Informative) Common Forms for Offshore Operation of Subsea Seismograph (OBS)7 Appendix B (Informative) Submarine Seismograph (OBS) Voyage Report List 10

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 of Standardization Documents" drafted. Please note that some content of this document may be patented. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed by the Ministry of Natural Resources of the People's Republic of China. This document is under the jurisdiction of the National Marine Standardization Technical Committee (SAC/TC283). This document is drafted by. Second Institute of Oceanography, Ministry of Natural Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, South China Academy of Sciences Institute of Oceanography, Guangzhou Marine Geological Survey. The main drafters of this document. Ruan Aiguo, Niu Xiongwei, You Qingyu, Qiu Xuelin, Hao Tianjue, Zhao Minghui, Wang Weiwei, Xia Shaohong, Wei Xiaodong, Huang Haibo, Lu Chuanchuan. Technical specification for active source seafloor seismograph survey

1 Scope

This document specifies the general requirements for the survey of submarine seismographs, technical indicators of survey equipment, marine exploration, acceptance of marine work data, and data Technical requirements for processing and interpretation, findings. This document is applicable to the use of submarine seismometers to carry out deep crustal structure detection, submarine resource exploration, geological disaster monitoring and other fields.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document. GB/T 12763.8 Marine Survey Specifications Part 8.Marine Geological and Geophysical Survey GB/T 12763.10 Oceanographic Survey Specifications Part 10.Submarine Topography Survey

3 Terms and Definitions

The following terms and definitions apply to this document. 3.1 Seismographs placed on the seafloor can be used to record elastic/seismic waves such as natural and artificial earthquakes and other acoustic information. Note. According to the frequency bandwidth, it is usually divided into two categories. the short-cycle OBS receiving frequency is not lower than 2Hz; the wide-band OBS receiving frequency is not higher than 0.02Hz. 3.2 activesource A seismic source that is artificially excited at sea based on physical or/and chemical means. 3.3 OBS deck control unit OBSdeckcontrolunit A communication device used for OBS parameter setting, ranging, release and recovery, etc. 3.4 reducedtimeprofile Converted time is used instead of real-time OBS recording profiles. Note. The calculation method of the reduced time is. real time - offset distance/reduced speed. The reduced speed can be selected according to the average speed of the target layer. 3.5 clock drift timedrift Deviation of OBS internal clock from standard time. 3.6 sinker anchor A device that provides negative buoyancy for the OBS, allowing the OBS to sink and couple to the seafloor. ......

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