Very close view of Surtseyan eruption at Anak Krakatau, Indonesia

A group of tourists visited Anak Krakatau on September 18, 2019, and managed to capture a surprising explosion from a very close distance.

The activity at the volcano has not changed over the past weeks, with intermittent phreatic or phreatomagmatic explosions in the crater lake,  Volcano Discovery reports.

Krakatau's seismic network recorded five eruptive events from September 9 to 15, according to PVMBG. A webcam at the summit recorded diffuse white plumes rising 150 m (492 feet) from the bottom of the crater, and dense gray-and-white ash plumes rising 300 m (984 feet). 

The Alert Level remains at 2 (on a scale of 1-4), and the public is warned to remain outside of the 2-km-radius (1.2 miles) hazard zone from the crater.

A violent phreatomagmatic eruption took place at the volcano at 02:09 UTC on June 25, 2019, and was also recorded on video:

Geological summary

The renowned volcano Krakatau (frequently misstated as Krakatoa) lies in the Sunda Strait between Java and Sumatra. The collapse of the ancestral Krakatau edifice, perhaps in 416 CE, formed a 7-km-wide (4.3 miles) caldera.

Remnants of this ancestral volcano are preserved in Verlaten and Lang Islands; subsequently Rakata, Danan and Perbuwatan volcanoes were formed, coalescing to create the pre-1883 Krakatau Island. Caldera collapse during the catastrophic 1883 eruption destroyed Danan and Perbuwatan volcanoes, and left only a remnant of Rakata volcano.

This eruption, the 2nd largest in Indonesia during historical time, caused more than 36 000 fatalities, most as a result of devastating tsunamis that swept the adjacent coastlines of Sumatra and Java. Pyroclastic surges traveled 40 km (25 miles) across the Sunda Strait and reached the Sumatra coast.

After a quiescence of less than a half century, the post-collapse cone of Anak Krakatau (Child of Krakatau) was constructed within the 1883 caldera at a point between the former cones of Danan and Perbuwatan. Anak Krakatau has been the site of frequent eruptions since 1927. (GVP)

Featured image credit: Sylvie Loison, John Van Marcke


Emission of steam and gas at Momotombo volcano, Nicaragua

October 18, 2019

After further investigation, the plume seen in satellite and webcam looks more like water vapor and gases, the Washington VAAC reported at 16:14 UTC on October 18, 2019, shortly after receiving information about possible volcanic ash plume rising above Momotombo...

Shishaldin volcano alert levels raised, Alaska

October 18, 2019

The Alaska Volcano Observatory (AVO) raised the Aviation Color Code for Shishaldin volcano to ORANGE and the Alert Level to WATCH on October 17, 2019. Satellite observations indicated that a lava effusion event began on October 13 and is likely continuing. The...

Shallow M6.0 earthquake hits Kermadec Islands, New Zealand

September 27, 2019

A strong and shallow earthquake registered by the USGS as M6.0 hit the Kermadec Islands, New Zealand at 12:05 UTC on September 27, 2019. The agency is reporting a depth of 35 km (21 miles). EMSC is reporting M6.1 at a depth of 2 km (1.2 miles). The epicenter was...

Shallow M6.1 earthquake hits Southwest Indian Ridge

September 25, 2019

A strong and shallow earthquake registered by the USGS as M6.1 hit Southwest Indian Ridge at 21:19 UTC on September 24, 2019. The agency is reporting a depth of 10 km (6.2 miles). EMSC is reporting M6.0 at a depth of 15 km (9 miles). M5.1 earthquake was registered...

Early snow hits Heilongjiang, China's coldest province

September 18, 2019

China's northernmost city of Mohe, Heilongjiang Province received new season's first snow on September 15, 2019. According to the local observatory, the snow came 25 days earlier than last year. ​The area, which is considered the coldest in China,...


Comments

No comments yet. Why don't you post the first comment?

Post a comment

Your name: *

Your email address: *

Comment text: *

The image that appears on your comment is your Gravatar