Japan Meteorological Agency Warns of Possible Volcanic Unrest
Mount Hakone, a popular tourist destination in Kanagawa Prefecture, is currently experiencing a noticeable increase in seismic activity. The Japan Meteorological Agency (JMA) has issued a statement urging the public and local authorities to remain alert, as these tremors could signal changes in the volcano’s internal activity.
In this article, we will explore what’s happening beneath Mount Hakone, the significance of the recent seismic uptick, and what precautions are advised.
What Is Happening at Mount Hakone?
In late July 2025, the JMA recorded a sudden rise in volcanic earthquakes centered beneath the Owakudani area, a known geothermal hotspot within the Hakone region. According to official reports:
- Dozens of volcanic earthquakes have occurred within a short time frame.
- Most tremors are shallow, occurring a few kilometers below the surface.
- Some changes in volcanic gas emissions and ground deformation have also been observed, though at a minor level.
While the current volcanic alert level remains at Level 1 (Normal), the situation is being closely monitored, as similar activity patterns preceded past unrest in the region.
Why Is Hakone a Volcanic Risk Zone?
Mount Hakone is not a towering stratovolcano like Mount Fuji, but it is still an active volcanic complex with a history of geothermal and seismic activity. Key facts:
- Last major eruption: around 3,000 years ago
- Recent volcanic unrest: notably in 2015, when alert levels were raised and the Owakudani area was temporarily closed to the public
- Presence of sulfur vents, fumaroles, and hot springs, indicating ongoing magmatic heat beneath the surface
Because of this, even minor signs of change—such as increased tremors—are taken seriously by volcanologists.
What Is the Japan Meteorological Agency Saying?
The JMA’s statement includes the following key points:
- Increased seismic activity may indicate volcanic fluid movement beneath the surface.
- No signs of imminent eruption have been detected, but the trend warrants attention.
- People in and around Owakudani and other high-risk areas should be prepared for potential restrictions or evacuation if the alert level increases.
- Residents and tourists should follow official updates and avoid spreading rumors or misinformation.
The JMA is deploying additional instruments to track seismic waves, gas emissions, and ground changes in real-time.
Should Tourists Be Worried?
At this time, tourism in Hakone is not restricted. However, visitors should:
- Check the latest volcanic information on the JMA website or local government channels
- Avoid closed or restricted areas, particularly around Owakudani
- Be aware that alert levels can change rapidly, and follow instructions from authorities in case of emergency
If you are planning a trip, consider staying informed through reliable sources rather than relying on social media or hearsay.
Final Thoughts: Stay Informed, Not Alarmed
Volcanic activity is a natural part of Japan’s dynamic geology. Mount Hakone has shown signs of unrest before, and in most cases, it returns to a quiet state without eruption. However, early detection and public awareness are critical in ensuring safety.
We encourage residents and travelers alike to remain calm but attentive.
Disaster preparedness and accurate information are the best defenses against volcanic risks.