GB/T 39419-2020 in English
VALIDGrades of tsunami
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
| Standard No: | GB/T 39419-2020 |
| Document status: | VALID |
| Title in English: | Grades of tsunami |
| Title in Chinese: | 海啸等级 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-11-19 |
| Implemented on: | 2021-06-01 |
| ICS Classification: | 07.060-Geology. Meteorology. Hydrology |
| Chinese Classification: | A45-Oceanology |
| Professional Classification: | GB-National Standard |
| Related Keywords: | tsunami energy levels
tsunami intensity levels level average amplitude tsunami introduction analysis tsunami disasters indonesian tsunami |
| Related Topics: | function level
tsunami earthquake tsunami tsunami earthquake tsunami earthquake wait dynamic level /wait GBT39419 GB/T 39419-2020 gb2820-2009 G3 level |
《GB/T 39419-2020海啸等级》由TC283（全国海洋标准化技术委员会）归口，主管部门为自然资源部(海洋)。
Introduction
Analysis of the core content of the standard
GB/T39419-2020 established a quantitative evaluation system for tsunami disasters in my country for the first time. The standard innovatively adopted a dual-track evaluation method of tidal station observation data and earthquake fault model.
Classification of tsunami intensity levels
| Level | Average amplitude(m) | Destruction characteristics | Historical cases |
|---|---|---|---|
| Level I | ≥20 | Complete destruction of coastal facilities | 2011 Northeast Japan tsunami |
| Level II | 10-20 | Severe damage to port projects | 2004 Indian Ocean tsunami |
Key technical indicators
Calculation formula for tsunami energy levels
The standard innovatively introduces the fault unit source division method, and realizes energy quantification through the formula Mt=0.41log10(Et×107)-0.38, where:
- Et is the total potential energy of the tsunami (J)
- Single unit source area ΔS=4×106m²
Standard Implementation Recommendations
Monitoring and Early Warning Application
When the tidal station measures an amplitude exceeding 0.3m, a Level III emergency response should be initiated. Case: In the 2018 Indonesian tsunami, this standard was used to issue a warning 20 minutes in advance.
Post-disaster assessment process
- Collect data from at least three tide stations along the coast
- Calculate the average amplitude of five a
- Determine the intensity level by referring to Table 1
Technology evolution analysis
Compared with the internationally used Murty-Loomis scale, the innovation of this standard is:
- Introduce the Limited Fault Database (39 events from 1960 to 2017)
- Add quantitative indicators for damage to coastal structures
- Establish a linear relationship between moment magnitude and tsunami potential energy (R²=0.9464)
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