According to Japan's Asahi TV on October 10, many places in Japan observed the tsunami phenomenon on the morning of the 9th, and issued tsunami warnings to Izu Islands, Chiba Prefecture, Kochi Prefecture and other places. Interestingly, despite the warning, the Japan Meteorological Agency said it was not yet known what caused the tsunami. This raises questions about whether the tsunami is likely to strike again before the warning is issued for some time to come.
Normally, the Japan Meteorological Agency issues a warning before a tsunami strikes, but this tsunami warning was issued after a tsunami was observed. At 6:40 a.m., the Japan Meteorological Agency issued its first tsunami warning, but surprisingly, a tsunami 0.4 meters high had been observed on Hachijo Island, only 15 minutes before the warning was issued. In subsequent observations, a tsunami of 0.6 meters was observed on the Izu Islands, while 0.3 meters and 0.2 meters were observed in Tateyama City, Chiba Prefecture, and Nichinan City, Miyazaki Prefecture. Faced with this situation, the Japan Meteorological Agency urgently held a press conference, saying that "there is a lot of unclear information at present" and "this is a very rare phenomenon."
Meteorological Agency officials said they typically predict tsunamis by their magnitude and frequency. Since critical information such as the epicenter and magnitude of an earthquake cannot be determined at this time, it is difficult to make accurate predictions. "If it was an ordinary earthquake, it would not have caused a tsunami." Despite this, according to TV Asahi reports, no earthquake of magnitude 1 or higher occurred in Japan on the morning of the 9th.
According to Japan's NHK, Mita Hatake, assistant professor at the University of Tokyo's Seismological Research Institute, pointed out that tsunamis are usually triggered by undersea earthquakes with a magnitude of 6.5 or more and the epicenter within 50 kilometers of the seabed. The tsunami did not occur in a major earthquake or tsunami area. This may be related to submarine volcanic activity. Kenji Satake, a professor at the Institute of Seismology at the University of Tokyo, said: "Considering that there has not been a magnitude 6 earthquake in the vicinity since last week, it is possible that a tsunami will occur before an earthquake or tsunami warning is issued." He called on the Japanese people to exercise caution.
Based on the above sources, we can't help but wonder: Is there a possibility that a tsunami will strike again after the tsunami warning is issued? Although experts have not yet been able to determine the exact cause of the tsunami, submarine volcanic activity may be an important factor. Especially in the absence of a magnitude 6 earthquake, a tsunami is more likely to occur before the warning is issued. We should all be vigilant and keep an eye on tsunami warnings to ensure our own safety.
Finally, I would like to ask a question and invite readers to leave their comments and opinions: Do you think Japan will be hit by another tsunami in the coming period? How should we respond to natural disasters like this?