Indonesian volcano's dramatic collapse
Published: 01:08 PM, 29 December 2018 Updated: 01:08 PM, 29 December 2018
Daily Bangladesh Desk
The scale of the dramatic collapse of the Indonesian volcano that led to last Saturday's devastating tsunami in the Sunda Strait is becoming clear.
Researchers have examined satellite images of Anak Krakatau to calculate the amount of rock and ash that sheared off into the sea.
They say the volcano has lost more than two-thirds of its height and volume during the past week.
Much of this missing mass could have slid into the sea in one movement.
It would certainly explain the displacement of water and the generation of waves up to 5m high that then inundated the nearby coastlines of Java and Sumatra.
Indonesia's disaster agency says more than 400 people are confirmed dead with 20 or so still missing. In excess of 40,000 have been displaced.
The Centre of Vulcanology and Geological Hazard Mitigation (PVMBG) has been studying pictures from a number of radar satellites, including the European Union's Sentinel-1 constellation and the German TerraSAR-X platform.
Radar has the advantage of being able to see the ground day or night, and to be able to pierce cloud.
The capability has allowed some initial measurements to be made of Anak Krakatau's lost stature, in particular on its western side.
What was once a volcanic cone standing some 340m high is now just 110m tall, says the PVMBG.
In terms of volume, 150-170 million cubic metres of material has gone, leaving only 40-70 million cubic metres still in place.
Quite how much mass was lost on 22 December itself and how much in the following days is unknown. Scientists may have a better idea once they have had a chance to visit the volcano and conduct more extensive surveys.
But with the eruptions still ongoing and a safety exclusion zone in force - no-one is going near Anak Krakatau.
Cone collapse with tsunami generation was considered a potential hazard before last Saturday.
Scientists had modelled the possibility six years ago, even identifying the western flank of Anak Krakatau as the section of the volcano most likely to fail.
The study, although simulating a larger event, predicted wave heights and coastal inundation times that were remarkably similar to what actually happened.
- Girl commits suicide in Capital
- Bangladesh to be poverty free by 2030: Kamal
- Israel strikes Gaza after rocket hits house
- British MPs bid to take control over Brexit
- Nation observes one-minute `blackout`
- At least 18 dead as floods sweep Iran
- National anthem to be sung simultaneously nationwide tomorrow
- President visits Combined Military Hardware Display
- Fruits that burn fat like crazy
- Paleontologists report world`s biggest Tyrannosaurus rex
- Probe into case against Shahidul to remain halted
- JCD leader held over derogatory remarks on Liberation War
- ACC`s charge sheet accused 12 incl Sonali Bank GM
- BCB to sell jersey ahead of World Cup
- Argentina players don`t deserve to wear the shirt: Maradona
- DAE upbeat on bumper mango production
- DCCI urged Chinese investors
- Zidane starts operation Mbappe
- Chhagalnaiya upazila election stayed
- Savar National Memorial prepared for 26 Mar
- Mymensingh City Corp polls May 5
- 1.35m HSC examinee this yr
- Ducsu VP, AGS’ support over job entry age extn movt
- Abahani beat Mohammedan to stay top
- Case filed over SAU`s Wasim murder
- Avijit murder case shifted to ATT for trial
- Griffith appointed Australia bowling coach
- Kamal for amplify value of harmony
- Dipu Moni calls month long ‘Coaching’ shut
- Biogas brings a better life to rural women
- All News »
- Ex-JaPa leader Mohsen Rashid joins Gono Forum
- Registration of Shuprovat Paribahan bus cancelled
- Coal power stations disrupt rainfall: Global study
- Nationwide prog on Bangabandhu’s birth centenary
- 7 incl presiding officer shot dead in Rangamati
- Local AL leader shot dead in Rangamati
- Students again on road with ‘We want Justice’
- Indonesia floods, mudslides: death toll rises to 89
- Six dead, 30 injured in China chemical plant blast
- Mozambique cyclone: death toll over 400
- BUP student killed in Narda road crash, sparks protest
- AL leader stabbed dead in Sunamganj
- First Bangladeshi girl in UN`s Education Conference
- Monali’s Dhaka concert postponed
- Protest continues demanding justice for Abrar
- NZ PM vows never to say gunman`s name
- Bangladesh eliminated from AFC U-23 Championship
- Drug trader killed in Meherpur gunfight
- 2 Bangladeshi Christchurch victims’ burial completed
- Student killed in Sirajganj road crash, road blockade
- Rain with gusty wind likely
- All 50 victims of Christchurch attack identified: police
- Mustafiz gets hitched
- HC revokes bail of Subarnachar rape accused
- 3 killed as train hits motobike in Gopalganj
- Drive launches to arrest Rangamati separatists
- Colourful Career of the Chief of Army Staff of Bangladesh Army
- 2nd phase of polls in 116 UZs underway
- Obaidul Quader’s bypass surgery decision today
- Singer Shahnaj Rahmatullah dies