Violent phreatomagmatic eruption at Anak Krakatau volcano, Indonesia

Violent phreatomagmatic eruption at Anak Krakatau volcano, Indonesia

A violent phreatomagmatic eruption took place at Anak Krakatau volcano, Indonesia at 02:09 UTC (09:09 LT) on June 25, 2019.

The volcano continues to be restless. Most of the time, its crater is only steaming, but occasionally, strong steam-driven explosions, such as the one on the video below, happen.

"These so-called surtseyan explosions are driven by violent interaction of magma or hot rocks or other fluids in the conduit with water, as the vent is still flooded. The video shows typical jets of dark trails of ash and steam ("rooster tails") as well as dangerous white steam surges spreading laterally over the ground. Overall, seismic activity at Krakatoa remains well above background," volcanologist Tom Pfeiffer of VolcanoDiscovery explained.

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: CVGHM


Large landslide takes out part of Highway 707 in Himachal Pradesh, India

July 30, 2021

A massive landslide took out a stretch of National Highway 707 in the remote Shilai subdivision of Sirmaur district, India's state of Himachal Pradesh on July 30, 2021. The incident took place near the town of Nahan. As a result, the highway connecting Shilai...

Unseasonal rainstorms hit Yemen, claiming at least 14 lives

July 28, 2021

At least 14 people have been killed over the past couple of days after unseasonal rainstorms hit the majority of Yemen's southern governorates. At least 1 000 households are in need of basic services, including at least 90 families in the Marib area and 400 in...

Violent hailstorm hits northern Italy

July 27, 2021

A violent hailstorm hit the town of Fidenza, northwest of Parma, Italy, on July 26, 2021, damaging hundreds of vehicles and bringing traffic on a highway between Milan and Naples to a standstill. A number of people were injured, mainly by glass shards from cracked...

Bright fireball over Bosnia and Herzegovina

July 23, 2021

A bright fireball streaked through the night sky over Bosnia and Herzegovina at 00:10 UTC on July 22, 2021. The event was captured by 9 Global Meteor Network cameras. The fireball ended at the height of 35.2 km (21.9 miles) with a final velocity of 5 km/s....

Deadly floods and mudslides hit Tajikistan

July 22, 2021

At least 12 people have died after heavy rain caused severe floods and mudslides in Tajikistan's Sughd Region on July 19, 2021. According to the country's Committee of Emergency Situations, two people died, 15 homes and 3 km (1.8 miles) of roads were damaged...


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