(Minami Nippon Shimbun)
Sakurajima Volcano Shows Swelling: Alert for Large Ejecta and Pyroclastic Flows Within 2km of Crater
On July 5th at 8 PM, the Kagoshima Local Meteorological Observatory issued a statement about Sakurajima, reporting that crustal movements indicating the mountain is swelling had been observed. Authorities are urging caution due to the risk of large ejecta and pyroclastic flows within approximately 2 kilometers from both the Minamidake summit crater and the Showa crater.
According to the observatory, these unusual movements have been detected since around 5 AM on July 5th, using specialized equipment like tiltmeters and extensometers installed on Sakurajima. They warn that if this swelling is suddenly released through an eruption, it could lead to heavy ash fall affecting the surrounding areas. The eruption alert level remains at 3, which means entry to the mountain is restricted for safety reasons.
What does “the eruption alert level” mean?
The eruption alert level is part of a volcanic alert system used in Japan to communicate the level of volcanic activity and the associated risks. Specifically, level 3 indicates that the volcano is showing significant signs of unrest, and there is a heightened risk of an eruption. Such an eruption could produce hazards like volcanic blocks, lava flows, or pyroclastic flows, particularly affecting areas near the crater. As a result of this risk, access to the volcano is restricted, and the public is advised not to approach the mountain to ensure their safety.
This level is typically issued when there is a possibility of eruptive activity that could pose a danger to people in the vicinity of the volcano. In Japan’s 5-tier volcanic alert system, level 3 sits between lower levels (indicating minimal or localized risk) and higher levels (which may require evacuation). In summary, an eruption alert level of 3 means the volcano is active and potentially dangerous, prompting authorities to limit entry and warn people to stay away.
