National Marine Forecasting Station in accordance with the Marine Disaster Emergency Response Plan
Issue a blue alert for waves
Affected by the strong cold air and the low pressure of the Bohai Sea, it is expected that from the night of November 8 to the day of November 9, there will be a large wave of 2.5 to 4.5 meters in the Bohai Sea and the Yellow Sea to the giant wave area, and a large wave of 3 to 5.5 meters in the East China Sea and the Taiwan Strait will appear in the giant wave area. In the coastal waters of Liaoning, Shandong, Jiangsu, Shanghai, Zhejiang and Northern Fujian, there will be medium to large waves of 2 to 3.3 meters, and the warning level of waves in coastal waters will be blue.
The National Marine ForecastIng Station reminds vessels operating in the above-mentioned waters to pay attention to safety, and all relevant coastal units take measures to prevent waves and avoid waves in advance.
In terms of storm surge, at present, the storm surge along the affected coast has fallen back and the tide level has returned to normal. The warning of this temperate storm surge has been lifted.
On June 16, 2019, the rapid inversion of the source mechanism of the MW7.3 earthquake in the Klmádeck Islands, New Zealand, and the high numerical simulation of tsunami waves
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Author: Shi Jianyu 1 2 Xu Zhiguo 1 2 Wang Juncheng 1 2 Li Hongwei 1 2
Units: 1. National Marine Environment Forecasting Center, Beijing 100081;
2. Tsunami Warning Center, Ministry of Natural Resources, Beijing 100081, China
Class number: p731.25
Publication Year, Volume, Issue (page number): 2021.38,Issue 5 (1-7)
Abstract:Using the waveform data of the global virtual seismic network and using the w-phase rapid source mechanism inversion method, the mw7.3 earthquake information in the sea near the Kmadeke Islands in New Zealand was obtained on June 16, 2019. Section I.: direction angle 186 °/ inclination angle 37 °/ sliding angle 71°, section surface II.: directional angle 29°/inclination angle 55°/sliding angle 104°, moment magnitude mw7.26. The results of the source mechanism show that the earthquake is a shallow source inter-plate seismic event with a mainly thrust nature. The fault layer geometric parameters of the source mechanism obtained by inversion were calculated by using the comcot model, and the simulation results showed that after the earthquake, a slight tsunami fluctuation was generated near the source, with a maximum amplitude of about 0.28 m, and the amplitude near the tide level station in Funawan Bay on The Island of Raoul was about 0.05 m, which was close to the actual observation value of 0.09 m.
Keywords: Kemadek Islands; w seismic phase; tsunami numerical simulation; comcot model
abstract：an earthquake with a magnitude of mw7.3 occurred near the kermadec islands, new zealand in june 16, 2019. based on the waveform from the global seismograph network, the focal mechanism of the earthquake is calculated rapidly using the w-phase method. for the nodal planeⅠ, strike is 186°, dip is 37°, rake is 71°, for the nodal plane Ⅱ, strike is 29°, dip is 55°, rake is 104° with the moment magnitude mwof 7.26. the focal mechanism solution shows that the earthquake with thrust-faulting occurred at the shallow boundary between the pacific plate and indian-australian plate. tsunami numerical simulation is implemented with comcot model using the actual fault plane solution from w-phase inversion. the simulation results show that the maximum waveform height is about 0.28 m. the maximum numerical simulation height near the raoul island is about 0.05 m, which is close to 0.09 m recorded by the gauge station.
key words：kermadec islands；w-phase；tsunami numerical simulation；comcot model
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Marine environment forecast for the next two days
Anticipate tomorrow,
The Bohai Sea has a medium wave of 2 to 3 meters to the big wave area;
The Yellow Sea, the western part of the East China Sea, and the Taiwan Strait have a large wave area of 2.5 to 3.5 meters;
In the eastern part of the East China Sea, in the waters near the Diaoyu Islands, in the ocean east of Taiwan, in the Bashi Strait, in the northern and central parts of the South China Sea, there are 3 to 4.5 meters of large waves to the Giant Wave Area;
The Gulf of Tonkin has 2 to 3 meters of middle wave to large wave area.
Anticipated the day after tomorrow,
The Bohai Sea wave area is maintained, with a wave height of 2 to 2.8 meters;
The Yellow Sea, the East China Sea, the Ocean east of Taiwan, the Bashi Strait, the northern and central Parts of the South China Sea are maintained in the Dalang area, with a wave height of 2 to 3.5 meters;
The Great Wave Area of the Taiwan Strait weakens and disappears;
The Large Wave Area of the Beibu Gulf is maintained, with a wave height of 2 to 3 meters.
Animated map of numerical forecast of waves in the Northwest Pacific Ocean from November 8 to 12
Sea conditions in the beautiful island waters
There are 3.3 meters of big waves in the waters near Diaoyu Island, 3.6 meters in the waters near Woody Island, 2.5 meters in the waters near Pingtan Island and Huangyan Island, and 2.1 to 2.4 meters in the waters near Changdao Island, Liugong Island, Nanji Island, Dongshan Island, Nan'ao Island, Boundary Island, and Wuzhizhou Island, and Shanghai Island is not suitable for boat travel;
Changshan Islands, Shengsi Islands, Daishan Island, Dongji Island, Putuo Mountain, Dachen Island, Dongtou Island, Chengshan Island, Meizhou Island, Wanshan Island, Hailing Island, Fiery Cross Reef near the sea has a 1.8 to 2 meters of medium wave, Juehua Island, Bodhi Island, Lingshan Island, Qinshan Island, Liandao Island, Yuhuan Island, Dongtou Island, Nanji Island, Chuanshan Islands, Hailing Island, Nansan Island, Weizhou Island near the sea there are 1.3 to 1.7 meters of medium wave, these islands are more suitable for boat travel;
The seas around the other beautiful islands in china are all light waves, and the sea conditions are good, which is very suitable for boat trips and islands.
Beautiful Islands refers to the following 35 islands:
Juehua Island, Changshan Islands, Bodhi Island, Changdao Island, Liugong Island, Lingshan Island, Qinshan Island, Liandao Island, Chongming Island, Shengsi Archipelago, Daishan Island, Dongji Island, Putuo Mountain, Dachen Island, Yuhuan Island, Dongtou Island, Nanji Island, Chengshan Island, Sandu Island, Pingtan Island, Meizhou Island, Dongshan Island, Diaoyu Island, Nan'ao Island, Wanshan Island, Chuanshan Island, Hailing Island, South Three Islands, Donghai Island, Weizhou Island, Demarcation Island, Wuzhizhou Island, Yongxing Island, Huangyan Island, Yongxia Reef.
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