Another eruption at Asosan volcano, Japan

another-eruption-at-asosan-volcano-japan

Another minor eruption took place at Japanese Asosan volcano (Mount Aso) in Kumamoto Prefecture late Thursday, April 18, 2019.

The eruption started at 23:24 UTC on April 18 (08:24 JST, April 19) at the No. 1 Nakadake crater, spewing ash up to 400 m (1 312 feet) above the crater, the Japan Meteorological Agency said. This is the same source as the previous eruption on Tuesday, April 16.

JMA maintains the volcanic alert level at 2 of 5, restricting entry to areas 1 km (0.62 miles) around the crater.

Even a small eruption can be dangerous as pyroclastic flows could be produced and large flying rocks could be ejected far away from the crater, JMA said.

Tuesday's eruption was Asosan's first since October 2016 when the volcano produced a column of ash up to 11 km (36 000 feet) above sea level and sent large boulders down the slopes of the volcano.

Ash rained down on cars, houses and roads in the city Aso and was reported as far as 320 km (200 miles) from the crater. It was the first explosive eruption at the volcano since 1989. It came 6 months after a series of earthquakes shook Kumamoto Prefecture.

Geological 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 km3 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 credit: Mount Aso erupting on April 16, 2019. Credit: YonhapnewsTV

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.

Leave a reply

Your email address will not be published.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