·

Mount Aso (Asosan) on Japan’s Kyushu island erupted early Monday, September 14

mount-aso-asosan-on-japan-s-kyushu-island-erupted-early-monday-september-14

Japan's Asosan volcano erupted about 00:43 UTC on Monday, September 14, 2015, sending a plume of thick black smoke and ash about 2.1 km (1.2 miles) into the air and disrupting flights.

According to the Japan Meteorological Agency, Asosan erupted without warning in one of Nakadake craters. The agency has raised the volcanic alert level from 2 to 3 – do not approach the volcano.

According to media reports, there were about 100 tourists and other visitors in the vicinity of the volcano at the time of eruption, but they were all quickly evacuated. There are no reports of injuries.

JMA's senior coordinator for volcanic affairs, Sadayuki Kitagawa, warned that a second eruption was possible "with possibility of volcanic rocks landing in an area over a 1 km radius (0.62 miles)." Kitagawa urged people to be vigilant for flying rocks and ash within a 2 km radius.

The volcano had a series of small-scale eruptions last week, JMA said and added that today's eruption exceeds the scale of past events.

Asosan is famous volcano for its largest caldera in the world. It is located at the center of Kyushu, about 1 000 km WSW of capital Tokyo and about 160 km (100 miles) N of recently restarted Sendai nuclear plant. Plant's operator, Kyush Electric Power Co, said the eruption would have no impact on the nuclear plant.

Geologic summary

The 24-km-wide Asosan caldera was formed during four major explosive eruptions from 300,000 to 90,000 years ago. These produced voluminous pyroclastic flows that covered much of Kyushu. The last of these, the Aso-4 eruption, produced more than 600 cu km of airfall tephra and pyroclastic-flow deposits. A group of 17 central cones was constructed in the middle of the caldera, one of which, Nakadake, is one of Japan's most active volcanoes. It was the location of Japan's first documented historical eruption in 553 AD.

The Nakadake complex has remained active throughout the Holocene. Several other cones have been active during the Holocene, including the Kometsuka scoria cone as recently as about 210 CE. Historical eruptions have largely consisted of basaltic to basaltic-andesite ash emission with periodic strombolian and phreatomagmatic activity. The summit crater of Nakadake is accessible by toll road and cable car, and is one of Kyushu's most popular tourist destinations. (GVP)

Featured image: Asosan eruption on September 14, 2015. Image credit: @kmmep (via Twitter).

If you value what we do here, create your ad-free account and support our journalism.

Share:

Related articles



Your support makes a difference

Dear valued reader,

We hope that our website has been a valuable resource for you.

The reality is that it takes a lot of time, effort, and resources to maintain and grow this website. We rely on the support of readers like you to keep providing high-quality content.

If you have found our website to be helpful, please consider making a contribution to help us continue to bring you the information you need. Your support means the world to us and helps us to keep doing what we love.

Support us by choosing your support level – Silver, Gold or Platinum. Other support options include Patreon pledges and sending us a one-off payment using PayPal.

Thank you for your consideration. Your support is greatly appreciated.

Sincerely,
Teo Blašković

$5 /month

  • Ad-free account
  • Clean user interface and fast browsing
  • Direct communication with us via chat and email
  • Suggest new features, content and applications
  • Early access to new apps and features

$50 /year

$10 /month

  • Ad-free account
  • Clean user interface and fast browsing
  • Direct communication with us via chat and email
  • Suggest new features, content and applications
  • Early access to new apps and features

$100 /year

$25 /month

  • Ad-free account
  • Clean user interface and fast browsing
  • Direct communication with us via chat and email
  • Suggest new features, content and applications
  • Early access to new apps and features

$200 /year

You can also support us on Patreon

support us on patreon

or by sending us a one-off payment using PayPal:


Commenting rules and guidelines

We value the thoughts and opinions of our readers and welcome healthy discussions on our website. In order to maintain a respectful and positive community, we ask that all commenters follow these rules:

  • Treat others with kindness and respect.
  • Stay on topic and contribute to the conversation in a meaningful way.
  • Do not use abusive or hateful language.
  • Do not spam or promote unrelated products or services.
  • Do not post any personal information or content that is illegal, obscene, or otherwise inappropriate.

We reserve the right to remove any comments that violate these rules. By commenting on our website, you agree to abide by these guidelines. Thank you for helping to create a positive and welcoming environment for all.

One Comment

  1. This eruption seem somewhat large but could be much, much larger. The article makes no mention of the height of the ash cloud, perhaps much less than 10KM, the minimum altitude needed to affect global weather. So, this volcano is dangerous but not a threat to the whole of Japan. It’s merely a minor pain.

Leave a reply

Your email address will not be published. Required fields are marked *