Indonesia's Mount Semeru erupts, ash plume reaches about 900 metres
In short
Mount Semeru in Indonesia's East Java province erupted at 5:29 a.m. local time on Oct 6, sending an ash column about 900 metres high, according to the country's volcano geology and disaster mitigation centre. The eruption lasted 135 seconds and the grey, dense ash drifted northeast. The volcano remains at alert level 3, and authorities advised people to stay out of a five-kilometre zone around the crater and summit.
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Mount Semeru, in Indonesia's East Java province, erupted at 5:29 a.m. local time on Oct 6, according to the Indonesian volcano geology and disaster mitigation centre. The eruption column reached about 900 metres, the eruption lasted 135 seconds, and the ash was grey and dense and spread to the northeast, the reports said. [ 1 , 3 ]
Activity at the volcano has been frequent this year. Indonesian volcano monitoring system data cited in the reports show 1,922 eruptions at Semeru as of Oct 6, the most of any volcano in the country, while 4,946 eruptions were recorded nationwide over the same period. [ 1 , 3 ]
Semeru remains at alert level 3, and authorities advised people to stay out of the area within five kilometres of the crater and summit. The documents do not say whether anyone was hurt, whether residents were evacuated, or whether transport was affected. [ 1 , 3 ]
Jiemian attributed its report to CCTV News, while CLS cited the Indonesian centre directly; Yicai carried only a headline. All three are Chinese business outlets. [ 1 , 2 , 3 ]
Why it matters
Semeru is the most active of Indonesia's volcanoes this year by eruption count, so the alert status and exclusion zone affect people living and travelling near the summit. The reports come from Indonesia's official monitoring centre via Chinese financial outlets, which suggests the event is being watched mainly for regional and travel-safety implications rather than market impact.
Key facts
- Mount Semeru, in East Java province, erupted at 5:29 a.m. local time on Oct 6. [ 1 , 3 ]
- The eruption column reached about 900 metres, and the eruption lasted 135 seconds. [ 1 , 3 ]
- The ash was grey and dense and spread to the northeast. [ 1 , 3 ]
- Semeru has recorded 1,922 eruptions so far this year, the most of any Indonesian volcano, according to Indonesian volcano monitoring system data. [ 1 , 3 ]
- Indonesia recorded 4,946 volcanic eruptions nationwide over the same period, the reports said. [ 1 , 3 ]
- Semeru remains at alert level 3, and authorities advised people not to be within five kilometres of the crater and summit. [ 1 , 3 ]
Confirmed by several sources
- Mount Semeru in East Java erupted at 5:29 a.m. local time on Oct 6 with an ash column of about 900 metres. [ 1 , 3 ]
- The eruption lasted 135 seconds and the ash drifted northeast. [ 1 , 3 ]
- Semeru is at alert level 3 and a five-kilometre exclusion zone around the crater and summit is advised. [ 1 , 3 ]
Still unclear
- Whether the eruption caused casualties, evacuations or disruption to flights or roads. The documents do not mention any impact on people, transport or infrastructure.
- The exact location and population affected near the volcano. The documents name East Java province but no city or district, and give no population details.
- Whether the alert level or the exclusion zone changed after this eruption. The documents say the level is maintained at 3, not that it was raised or lowered.
What local media are saying
Timeline, local time
- Mount Semeru erupts in East Java; the eruption column reaches about 900 metres and the eruption lasts 135 seconds, with grey, dense ash spreading northeast. [ 1 , 3 ]
- CLS reports the eruption, citing the Indonesian volcano geology and disaster mitigation centre, and notes 1,922 Semeru eruptions and 4,946 nationwide this year. [ 1 ]
- Yicai publishes a headline report on the eruption. [ 2 ]
- Jiemian publishes the same details, sourced to CCTV News. [ 3 ]