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DBT22-2020: Technical requirements of instruments in network for earthquake monitoring. Seismograph
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Technical requirements of instruments in network for earthquake monitoring. Seismograph
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DB/T 22-2020
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Technical requirements of instruments in network for earthquake monitoring.Seismograph
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Basic data | Standard ID | DB/T 22-2020 (DB/T22-2020) | | Description (Translated English) | Technical requirements of instruments in network for earthquake monitoring. Seismograph | | Sector / Industry | Chinese Industry Standard (Recommended) | | Classification of Chinese Standard | P15 | | Classification of International Standard | 91.120.25 | | Word Count Estimation | 48,490 | | Date of Issue | 2020-09-21 | | Date of Implementation | 2021-01-01 | | Older Standard (superseded by this standard) | DB/T 22-2007 | | Quoted Standard | GB/T 4208-2017; GB/T 6587-2012; GB/T 15629.3-2014; GB/T 17626.5-2019; GB/T 17626.29-2006; GJB 101A-1997; GJB 598B-2011; DB/T 21-2007 | | Regulation (derived from) | State-Earthquake Announcement (2020) No. 54 | | Issuing agency(ies) | China Earthquake Administration | | Summary | This standard specifies the technical indicators, functional requirements, test methods and environmental applicability of seismographs into the network. This standard applies to the design, production, use, maintenance, introduction and quality supervision of seismographs. | DBT22-2020: Technical requirements of instruments in network for earthquake monitoring. Seismograph
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Technical requirements of instruments in network for earthquake monitoring.Seismograph
ICS 91.120.25
CCSP15
People's Republic of China Earthquake Industry Standard
Replace DB/T 22-2007
Technical requirements for seismological observation instruments into the network
Seismograph
2020-09-21 release
2021-01-01 implementation
Issued by China Earthquake Administration
Table of contents
Foreword Ⅴ
Introduction Ⅶ
1 Scope 1
2 Normative references 1
3 Terms, definitions and abbreviations 1
3.1 Terms and definitions 1
3.2 Abbreviations 3
4 Seismometer 4
4.1 Technical parameters and indicators 4
4.2 Signal output parameters 7
4.3 Transfer function 7
4.4 Calibration device 7
4.5 Pendulum zero signal 7
4.6 Control function 7
4.7 Installation Marks and Benchmarks 8
4.8 Power supply 8
4.9 Seismometer interface 8
4.10 Enclosure protection requirements 8
4.11 Temperature and humidity range 8
5 Data collector 8
5.1 Basic requirements for acquisition channel configuration 8
5.2 Acquisition channel technical parameters and indicators 8
5.3 Technical indicators of auxiliary acquisition channel 9
5.4 Technical indicators of low-speed acquisition channel 10
5.5 grid value 10
5.6 Calibration test signal source 10
5.7 Clock and time service 11
5.8 Network access 11
5.9 Real-time data transmission 11
5.10 Event trigger function 11
5.11 Data logging 11
5.12 File transfer 12
5.13 Management functions 12
5.14 Power supply 12
5.15 Interface and connector 12
5.16 Enclosure protection requirements 12
5.17 Temperature and humidity range 12
6 Integrated digital seismograph 13
6.1 Main technical indicators 13
6.2 Transfer function 13
6.3 Data Recording 13
6.4 Data output 13
6.5 Calibration test function 13
6.6 Management functions 13
6.7 Power supply 13
6.8 Interface and connector 13
6.9 Enclosure protection requirements 14
6.10 Temperature and humidity range 14
7 Borehole Seismograph 14
7.1 Basic technical requirements 14
7.2 Tilt adjustment 14
7.3 Sealing cylinder 14
7.4 Lead wire 14
7.5 Wellhead device 14
7.6 Power supply 15
7.7 Installation methods and accessories 15
7.8 Geographical bearing correction 15
7.9 Temperature range 15
8 Technical index test method 15
8.1 Seismometer 15
8.2 Data collector test 17
8.3 Integrated digital seismograph 23
8.4 Borehole Seismograph 24
9 Electromagnetic compatibility and environmental adaptability test 25
9.1 Electromagnetic compatibility test 25
9.2 Environmental adaptability test 25
Appendix A (Normative) Shaking Table Test Method 26
A.1 Technical requirements for low-frequency shaking table test system 26
A.2 Test environment 26
A.3 Test items and parameters 26
A.4 Test operation and data processing requirements 27
A.5 Sine wave test data processing method 27
A.6 Sensitivity test 28
A.7 Lateral sensitivity test 28
A.8 Amplitude-frequency characteristic test 28
A.9 Linearity test 29
A.10 Full-scale test 29
Appendix B (Normative) Calibration coil excitation test method 30
B.1 Test equipment and environment 30
B.2 Sinusoidal signal test 30
B.3 Step signal test 31
B.4 Long-period channel sensitivity test of ultra-wideband seismograph 32
Appendix C (Normative) Distortion calculation method 33
C.1 FFT-based total harmonic distortion calculation method 33
C.2 Distortion calculation method based on sine function fitting 33
C.3 Window function 33
Appendix D (Normative) Seismograph step response signal data processing method 34
D.1 Seismograph transfer function and step signal response 34
D.2 Fitting formula 34
D.3 Fitting results 34
Appendix E (Normative) Seismometer noise test and calculation method 35
E.1 Test site and environment 35
E.2 Reference Seismograph 35
E.3 Equipment installation and commissioning 35
E.4 Data Record 36
E.5 Data Processing 36
E.6 Test results 36
E.7 Noise power spectrum calculation method 36
E.8 The method of calculating seismograph noise using the data recorded simultaneously by two seismographs 37
E.9 Method of calculating seismograph noise using 3 seismographs recorded simultaneously 37
Appendix F (Normative) Clock skew analysis method based on collected data 39
F.1 Data interpolation 39
F.2 Clock difference calculation 40
F.3 Calculation of the relative clock difference between two simultaneous observation data segments 40
Reference 41
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"
Drafting.
This document is one of the series of standards in the "Technical Requirements for Seismic Observation Instruments' Network Access" The standard structure and name of the series are as follows.
---Common technical parameter expressions and test methods for the technical requirements of seismic observation instruments into the network (DB/T 21-2007)
---Technical requirements for seismic observation instruments into the network gravimeter (DB/T 23-2007)
---Technical requirements for seismic observation instrument access to the grid. Geoelectricity observation instrument Part 1.DC earth resistivity meter (DB/T 29.1-2008)
---Technical requirements for the network access of seismic observation instruments. Geoelectric observation instrument Part 2.Geoelectric field instrument (DB/T 29.2-2008)
---Technical requirements for seismic observation instruments into the network. Geomagnetic observation instrument Part 1.Fluxgate magnetometer (DB/T 30.1-2008)
---Technical requirements for the network access of seismic observation instruments. Geomagnetic observation instrument Part 2.Proton vector magnetometer (DB/T 30.2-2008)
---Technical requirements for seismic observation instruments into the network. Crustal Deformation Observer Part 1.Inclinometer (DB/T 31.1-2008)
---Technical requirements for seismic observation instruments into the network. Crustal Deformation Observer Part 2.Strain Gauge (DB/T 31.2-2008)
---Technical requirements for seismic observation instruments into the network. Underground fluid observation instrument Part 1.Pressure water level gauge (DB/T 32.1-
2008)
---Technical requirements for seismic observation instruments into the network. Underground fluid observation instrument. Part 2.Thermometer (DB/T 32.2-2008)
---Technical requirements for seismic observation instruments into the network. Underground fluid observation instrument. Part 3.Scintillation radon instrument (DB/T 32.3-2008)
---Technical requirements for the network access of seismic observation instruments Seismic intensity meter (DB/T 59-2015)
This document replaces DB/T 22-2007 "Seismograph Technical Requirements for Seismic Observation Instruments". Compared with DB/T 22-2007, the main
The changes are as follows.
---Added the technical requirements for ultra-wideband seismometer, integrated digital seismograph and borehole seismograph;
---Added the technical requirements for the auxiliary acquisition channel of the data collector and the technical requirements for the low-speed acquisition channel;
---Deleted the functional requirements for the whole seismograph;
---Reorganized and classified the technical index test methods according to the equipment;
---Added the test content of borehole seismograph;
---Added electromagnetic compatibility test content;
---Delete the earth noise model;
---Added the vibration table test method;
---Added the calibration coil excitation test method;
---Added the distortion calculation method;
---Added the step response signal data processing method of the seismograph;
---Added the calculation method of seismometer noise based on the observation of 3 seismometers at the same site;
---Added a clock deviation analysis method based on collected data.
This document was submitted by the China Earthquake Administration.
This document is under the jurisdiction of the Earthquake Monitoring and Prediction Standardization Technical Committee.
Drafting organizations of this document. Institute of Earthquake Prediction, China Earthquake Administration, Institute of Geophysics, China Earthquake Administration, Earthquake Administration of Guangdong Province, China
The First Monitoring Center of the Earthquake Administration.
The main drafters of this document. Xue Bing, Zhu Xiaoyi, Wang Hongti, Yuan Songyong, Ma Jiemei, Xie Jianbo, Li Wenyi.
Important note. If you have any comments or suggestions during the implementation of this standard, please send them to [email protected] and copy them to [email protected]
[email protected], or send it to the Earthquake Monitoring and Prediction Standardization Technical Committee (Address. 5 Heng Street, Sanlihe South, Xicheng District, Beijing
No., China Seismological Network Center. Postcode. 100045), and indicate the contact information.
Introduction
The observation of a seismograph can be displacement, velocity or acceleration. At present, seismographs whose main objective is to observe microseisms and teleseisms are basically
The ground vibration velocity is used as the observation measurement, so this document only contains the relevant content of the seismograph that observes the ground vibration velocity, not the ground vibration velocity.
This document does not apply to the surface vibration velocity as a vibration observation instrument for observation.
Seismographs generally include two relatively independent parts. seismometer and data collector. There are also many seismograph products that combine seismometer and data
The collectors are integrated together, and their miniaturization and low power consumption are more suitable for mobile observation, array observation and other fields. Frequency characteristics of seismograph
The performance mainly depends on the seismometer, and the modifiers in the seismograph term based on the observation frequency band definition also apply to the seismometer, which is not mentioned in this document
Make a clear distinction. There are similar situations with borehole seismometers and borehole seismometers. For seismographs in different subdivided application fields, their structural forms,
The main technical parameters (sensitivity, observation frequency band) are quite different. This document allows the use of seismometer sensitivity and observation frequency bands.
Use other nominal values to adapt to reasonable changes in technical parameters, and at the same time encourage the goal of improving the overall performance of the system, the use of seismometers and data collection
The collector is fixedly matched or integrated, and digital calibration is used to reduce errors. In this case, seismometer and data acquisition should be used
The overall technical indicators of the fixed combination of the device are used as the basis for judging the performance of the system.
Technical requirements for seismological observation instruments into the network
1 Scope
This document specifies the technical indicators, functional requirements, test methods and environmental applicability of seismographs into the network.
This document is applicable to the design, production, use, maintenance, introduction and quality supervision of seismographs.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations
Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
This document.
GB/T 4208-2017 Enclosure protection grade (IP code)
GB/T 6587-2012 General Specification for Electronic Measuring Instruments
GB/T 15629.3-2014 Information technology system telecommunications and information exchange specific requirements for local area networks and metropolitan area networks
Part 3.Carrier Sense Multiple Access with Collision Detection (CSMA/CD) access method and physical layer specification
GB/T 17626.5-2019 Electromagnetic compatibility test and measurement technology surge (impact) immunity test
GB/T 17626.29-2006 Electromagnetic compatibility test and measurement technology DC power input port voltage sag, short-term interruption and
Immunity test for voltage changes
GJB101A-1997 General specification for environment-resistant quick-separation small circular electrical connectors
GJB598B-2011 General Specification for Environmentally Resistant Quick-Separation Circular Electrical Connectors
DB/T 21-2007 Technical Requirements for Seismic Observation Instruments' Network Access Common Technical Parameter Expressions and Test Methods
3 Terms, definitions and abbreviations
3.1 Terms and definitions
The following terms and definitions apply to this document.
3.1.1
Seismometer
A device that converts the amount of ground motion into a voltage.
Note. Usually refers to the sensor part of the seismograph.
3.1.2
Dataacquisitiondevice
A device that converts analog voltage signals into digital quantities and records them.
3.1.3
Seismograph
An instrument that records ground motion includes a sensing part (seismometer) and a recording part (data collector).
3.1.4
Digital seismograph
A seismograph that records in digital quantities (digital numbers).
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