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Grades of tsunami
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Basic data
Standard ID: GB/T 39419-2020 (GB/T39419-2020)
Description (Translated English): Grades of tsunami
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A45
Classification of International Standard: 07.060
Word Count Estimation: 10,128
Date of Issue: 2020-11-19
Date of Implementation: 2021-06-01
Regulation (derived from): National Standard Announcement No. 26 of 2020
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration
GB/T 39419-2020: Grades of tsunami
---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.
(Tsunami level)
ICS 07:060
A45
National Standards of People's Republic of China
Tsunami level
Gradesoftsunami
2020-11-19 released
2021-06-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Foreword
This standard was drafted in accordance with the rules given in GB/T 1:1-2009:
This standard was proposed by the Ministry of Natural Resources of the People's Republic of China:
This standard is under the jurisdiction of the National Marine Standardization Technical Committee (SAC/TC283):
Drafting organization of this standard: National Marine Environmental Forecast Center:
The main drafters of this standard: Fan Tingting, Yuanye, Zhao Lianda, Wang Peitao, Wang Juncheng, Hou Jingming:
Tsunami level
1 Scope
This standard specifies the determination and classification method of the intensity level of the tsunami and the energy level of the earthquake tsunami:
This standard is applicable to tsunami disaster monitoring and evaluation, scientific research and news reporting:
2 Terms and definitions
The following terms and definitions apply to this document:
2:1
Tsunami
Long-period, small-amplitude gravity waves provoked by underwater earthquakes, volcanic eruptions or underwater collapses and landslides, at a speed of hundreds of kilometers per hour
It spreads to the shore and forms a fierce and harmful wave:
Note: Rewrite GB/T 15920-2010, definition 2:5:60:
2:2
Tsunamiamplitude
The absolute value of the difference between the height of the tsunami crest (trough) and the undisturbed sea level at that time:
2:3
Tsunami intensity tsunamiintensity
The extent of the impact of a tsunami on a certain area along the coast:
Note: Generally, it can be divided based on the tsunami wave amplitude observed by coastal tide station:
2:4
Tsunami energy level tsunamimagnitude
A measure of natural energy released during a tsunami:
3 Types of tsunami levels
3:1 Tsunami intensity level
According to the impact of the tsunami on a certain area along the coast, it is divided according to the intensity of the tsunami:
3:2 Tsunami energy level
According to the magnitude of the energy released by the earthquake and tsunami, it is divided according to the tsunami energy level:
4 Tsunami intensity
4:1 Calculation of average volatility
The calculation is based on the average value of the maximum tsunami wave amplitude observed by the tide station on a certain shore section: The calculation method is shown in formula (1):
Hav=
n∑
i=1
Hi (1)
......
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