The Tsunami Warning Center of the Ministry of Natural Resources, relying on the global real-time tsunami monitoring network, obtained the real-time information of the tsunami caused by the volcanic eruption. Judging from the scope and intensity of the impact, the tsunami is a medium-intensity transoceanic tsunami.
According to the latest monitoring results, the Tsunami Warning Center of the Ministry of Natural Resources analyzed that the volcanic eruption triggered a transoceanic tsunami that affected the entire Pacific coast. Countries such as Chile, Japan and New Zealand on the Pacific coast have observed significant tsunami waves, with the maximum tsunami wave amplitude reaching 1.5 meters. Tsunami waves were detected in the coastal waters of my country in the early morning of the 16th. Among them, the largest tsunami wave at the Shipu Station in Zhejiang was about 20 cm, and the tsunami wave at the other tidal stations were all less than 15 cm. This process did not cause catastrophic impact on my country’s coast.
Relevant experts from the Tsunami Warning Center of the Ministry of Natural Resources analyzed that the impact of this process on my country’s coast is relatively small, mainly because the coast of my country’s mainland is blocked by the Ryukyu Islands and Southeast Asian countries, coupled with the protection of the broad continental shelf, after the transoceanic tsunami enters this sea area. , the energy is attenuated to a greater extent, so the impact on the continental coast is small.
Wang Peitao, associate researcher at the Tsunami Warning Center of the Ministry of Natural Resources:Volcanic eruption is a continuous process, but triggering tsunamis often requires a strong eruption time. Therefore, whether the follow-up can have a sustained impact on our country mainly depends on the intensity of future volcanic eruptions. Judging from the current observation data, the tsunami caused by the strong volcanic eruption is gradually weakening, and the water level along the coast is gradually returning to normal.
After the eruption of the Hongahaapai Island volcano in the Tonga sea, the Chinese satellite obtained remote sensing images of a large number of volcanic pumice in the Tonga sea. From the latest remote sensing image of Gaofen-1B satellite released by the National Satellite Ocean Application Center of the Ministry of Natural Resources, it can be seen that there are a large number of red and brown pumice stones floating in the sea area for tens of kilometers around Hongaha Apay Island, and their shapes are dotted. Shape or strip, strip length from a few meters to more than 10 kilometers.
Pumice is formed by the contact of volcanic lava and seawater. Its main component is usually silica, which is soft in texture and small in specific gravity. It gathers together under the action of waves to form a large area of pumice. Experts from the National Satellite Marine Application Center analyzed that a large number of volcanic pumice stones will not only affect the navigation of ships, but also fish resources in the sea will die due to accidentally swallowing the pumice stones, causing ecological concerns.
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