Indonesian volcano's dramatic collapse
Published: 01:08 PM, 29 December 2018 Updated: 01:08 PM, 29 December 2018
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.
- Make popcorn at home
- Woman teems 4 children at once
- Mentally disabled man memorizes entire Holy Quran
- ‘Enjoy rape in failure to prevent’
- Chris: World’s heaviest sheep ever
- Alia-Ranbir wedding card revealed!
- ‘Nagad’ account in 1 minute
- Govt incentive surges remittance flow
- Goat morsels plant: Youth killed in scuffle
- MPO Enroll: Priority given to remote areas’ insts
- 4 companies fined in Chandina market
- FICA supports players’ strike
- ECNEC clears 5 projects of Tk 4636.80 cr
- No ‘Classical Music Festival’ this year
- Asif plays villain in debut!
- 37th BCS Non-cadre result published
- OC dismissed for intercedes Razakar
- Sand imported from China instead of cotton
- No Salary for 27 months despite daily attendance Tk 60
- UK team meets DU VC
- Nusrat murder case verdict Oct 24
- Way to use body scrubber to get brighter skin
- NBR gets time to report on chemical testing unit
- 157 dead in Iraq protests: new official toll
- Bimal Biswas left WPB
- Hearing on Robi’s due appeal Thursday
- Cricketers’ movement unexpected: Papon
- Amitabh apologizes, storm on social media
- Banning unlicensed easybike-rickshaw in city
- Stop unhealthy race on roads: PM
- All News »
- Pooja Zunjar, new born baby die as family fails to get ambulance
- Child Tuhin murder: 2 relatives give statement
- JMI Hospital Requisite holds IPO road show
- Padma Bank Limited receive insurance cheque
- Now father allegedly kills child in Faridpur
- 3 women killed as truck hits human hauler
- Now PUBG bans in Bangladesh
- Jubo League age decision at Ganabhaban: Quader
- Brutal murder of child: Case filed against 10
- Typhoon Hagibis: Death toll rises to 68 in Japan
- Abrar murder chargesheet soon: HM
- PM urges UGC not to go beyond rules
- Sunny, Al Amin recalled for India T20 series
- Siddik has relations with multiple girls, alleges wife Mim
- New labor laws in Qatar benefiting migrant workers
- 35 pilgrims killed as bus crashes in Saudia Arabia
- Padma Bridge work progress 84 pc
- Gold bars worth Tk 6.5cr recovered in Shah Amanat
- DU ‘Ka’, ‘Cha’ unit admission test results tomorrow
- Johnson sends unsigned letter to EU for Brexit delay
- Japan keen to expand existing bilateral ties: Envoy
- 2 pedestrians die after being hit by bus
- T20 World Cup Qualifier begins today
- ‘Kathin Chibar Dan’ being celebrated
- BUET students’ call off protests
- 9 addl judges appointed to HC
- City Bank MD alleged for sexual assault
- DU ‘A’ unit admission test result postponed
- Sabila Nur’s honeymoon preparation!
- ‘Kurigram Express’ to be launched today