Indonesia raises Anak Krakatau alert to Level III after 13 eruptions recorded in a day

Indonesia's Anak Krakatau volcano erupted 13 times in one day, raising its alert status to Level III, the second-highest level.

Despite increased activity, seismic monitoring hasn't shown a significant rise in volcanic earthquakes, though sulphur emissions are notable.

Authorities warn against entering a five-kilometre radius of the volcano and advise coastal communities to heed safety instructions.

JAKARTA, Oct 10 — Indonesia’s Anak Krakatau volcano has shown renewed activity, recording at least 13 eruptions yesterday and prompting authorities to raise its alert status to Level III, the second-highest level in the country’s four-tier volcanic alert system.

The Geological Agency said the alert was raised from Level II effective 9pm local time yesterday, following an assessment of volcanic activity since early this month.

“Signs of increased activity on a low scale began to emerge in early October 2026,” the agency said in its assessment dated October 9.

It noted however, that seismic monitoring had not indicated a significant overall increase in volcanic earthquakes.

Anak Krakatau, located in the Sunda Strait between Java and Sumatra, was downgraded to Level II on September 21 following a reduction in volcanic activity, after remaining at Level III since early September.

The latest activity follows a series of major eruptions in early September that sent volcanic ash into the atmosphere, forcing temporary airport closures. The event disrupted 2,961 flights and affected about 341,000 passengers.

According to eruption reports published on the Volcanology and Geological Hazard Mitigation Centre’s (PVMBG) website, yesterday’s documented eruptions included one at 4.17pm that sent an ash column 250 metres above the summit, followed by another at 4.30pm with a 150-metre column.

Eleven further eruptions were recorded between 6.28pm and 9.20pm, although their ash columns could not be observed. PVMBG’s full-day seismic monitoring recorded 26 eruption earthquakes.

Apart from yesterday’s 13 individually reported eruptions, Anak Krakatau recorded at least five others earlier this month — four on October 5 and one on October 8 — bringing the documented minimum to 18 since the beginning of October.

The Geological Agency said satellite monitoring detected sulphur dioxide emissions ranging from 71 to 237.5 tonnes per day between September 21 and October 9, while incandescence had been observed at the volcano since October 6.

Meanwhile, according to an advisory issued by Australia’s Darwin Volcanic Ash Advisory Centre (VAAC), volcanic ash reached an altitude of about 1.8 kilometres above sea level at 10.50pm yesterday, drifting westward over the Sunda Strait towards the Indian Ocean at approximately nine kilometres per hour, before being forecast to dissipate within six to 12 hours.

The Geological Agency warned residents, visitors, and tourists of volcanic rocks, heavy ashfall, lava flows, and secondary eruptions, and prohibited all from entering a five-kilometre radius of the eruption centre and areas within one kilometre of two newly formed islands northwest and southeast of Anak Krakatau.

It also urged coastal communities in Banten and Lampung provinces to remain calm, avoid spreading unverified tsunami claims, and follow official safety instructions. — Bernama

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印度尼西亚的喀拉喀托之子火山一天内喷发了 13 次，警戒级别升至 III 级，为第二高级别。

尽管火山活动有所增加，但地震监测并未显示火山地震显著增加，尽管硫排放量值得关注。

当局警告不要进入火山周围五公里半径范围内的区域，并建议沿海社区居民遵守安全指示。

雅加达，10 月 10 日——印度尼西亚的喀拉喀托之子火山再次出现活动迹象，昨天至少记录到 13 次喷发，促使当局将其警戒级别提高到 III 级，这是该国四级火山警戒系统中的第二高级别。

地质局表示，根据本月初以来的火山活动评估，警报级别已于昨日当地时间晚上9点从二级提升至更高一级。

该机构在 10 月 9 日发布的评估报告中表示：“2026 年 10 月初，小规模活动增加的迹象开始出现。”

但报告指出，地震监测并未显示火山地震总体上出现显著增加。

位于爪哇岛和苏门答腊岛之间的巽他海峡的喀拉喀托之子火山，在9月初以来一直处于三级火山活动状态后，于9月21日降级为二级火山活动状态，原因是火山活动有所减弱。

此次火山活动紧随9月初的一系列大规模喷发之后，喷发产生的火山灰进入大气层，迫使机场暂时关闭。该事件导致2961个航班中断，约34.1万名乘客受到影响。

根据火山学和地质灾害缓解中心 (PVMBG) 网站上发布的喷发报告，昨天记录在案的喷发包括下午 4 点 17 分的一次喷发，喷出的火山灰柱高达山顶 250 米；随后在下午 4 点 30 分又发生了一次喷发，喷出的火山灰柱高达 150 米。

从下午6点28分到晚上9点20分，又记录到11次喷发，但未能观测到火山灰柱。PVMBG全天地震监测记录到26次与火山喷发相关的地震。

除了昨天单独报告的 13 次喷发外，喀拉喀托之子火山本月早些时候至少还记录了 5 次喷发——10 月 5 日 4 次，10 月 8 日 1 次——自 10 月初以来，记录在案的喷发次数至少为 18 次。

地质局表示，卫星监测显示，9 月 21 日至 10 月 9 日期间，二氧化硫排放量为每天 71 至 237.5 吨，而自 10 月 6 日以来，该火山已出现白炽现象。

与此同时，根据澳大利亚达尔文火山灰咨询中心（VAAC）发布的公告，昨天晚上 10 点 50 分，火山灰高度达到海平面以上约 1.8 公里，以大约每小时 9 公里的速度向西漂移，越过巽他海峡，进入印度洋，预计将在 6 到 12 小时内消散。

地质局警告居民、游客和观光客注意火山岩、大量火山灰、熔岩流和二次喷发，并禁止所有人进入喷发中心五公里半径范围内的区域，以及喀拉喀托之子火山西北和东南方向两个新形成的岛屿一公里范围内的区域。

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