Anak Krakatau volcano activity continues, but the Sunda Strait safe from tsunami threat

Passengers at a service counter at Soekarno-Hatta International Airport in Jakarta, Indonesia, on Monday, Sept. 7, 2026. Indonesia halted flights at several airports, including Jakarta's main gateway, after ash from Mount Anak Krakatau spread across Java and Sumatra, with further disruptions possible as eruptions continue. -- Photographer: Dimas Ardian/Bloomberg

JAKARTA (Bernama): The Sunda Strait remains safe from a tsunami threat amid ongoing activity at Mount Anak Krakatau, with no tsunami detected as authorities continue round-the-clock monitoring.

The volcano is located in the strait, between the Indonesian islands of Java and Sumatra.

Indonesia’s Meteorology, Climatology and Geophysics Agency (BMKG) said its high-frequency (HF) radar monitoring placed the probability of a tsunami in the Sunda Strait in the low category as of 8 am Monday.

"The Sunda Strait crossing route remains in safe condition,” the agency said in a statement on Monday.

BMKG Acting Deputy for Geophysics Ardhasena Sopaheluwakan said monitoring at 20 tsunami gauges around the strait also showed no unusual changes in sea level that would indicate a tsunami.

While the gauges showed no indication of a tsunami, he said BMKG’s other instruments recorded increased volcanic lightning and geomagnetic disturbances between midnight and 4 am, although both were less intense than during the first eruption on Sept 4.

On sea conditions, BMKG Acting Deputy for Meteorology Andri Ramdhani said surface currents were predominantly moving southwest towards the Indian Ocean at between 0.4 and 0.9 knots, with waves measuring between 0.3 and 1.2 metres.

Looking ahead, he said wave heights in the Sunda Strait were forecast to range between 0.5 and 2.0 metres from Sept 8 to 13, with generally clear to partly cloudy conditions expected around Anak Krakatau and the strait.

Andri said BMKG had issued 39 Significant Meteorological Information (SIGMET) advisories for aviation since the first eruption on Sept 4, with the latest showing ash reaching 15,000 feet (4,572 metres) and moving westward towards Sumatra and the Indian Ocean at 15 knots.

"Based on an analysis of Himawari-9 satellite imagery at 9 am, the wind pattern generally pushed Mount Anak Krakatau’s volcanic ash westward,” he said. -- Bernama

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2026年9月7日星期一，乘客在印度尼西亚雅加达苏加诺-哈达国际机场的服务柜台前办理手续。由于喀拉喀托之子火山喷发的火山灰蔓延至爪哇岛和苏门答腊岛，印尼暂停了包括雅加达主要门户机场在内的多个机场的航班，随着火山喷发的持续，航班中断的情况可能还会进一步加剧。——摄影：Dimas Ardian/彭博社

雅加达（马新社）：尽管喀拉喀托之子火山活动持续，巽他海峡仍未受到海啸威胁，当局继续24小时不间断监测，尚未探测到海啸。

这座火山位于印度尼西亚爪哇岛和苏门答腊岛之间的海峡中。

印度尼西亚气象、气候和地球物理局（BMKG）表示，截至周一上午 8 点，其高频（HF）雷达监测显示巽他海峡发生海啸的可能性较低。

该机构周一在一份声明中表示：“巽他海峡过境路线仍然安全。”

印尼气象、气候和地球物理局代理副局长阿尔达塞纳·索帕赫卢瓦坎表示，海峡周围 20 个海啸监测站的监测结果也显示，海平面没有出现任何异常变化，这表明没有发生海啸。

虽然测量仪显示没有海啸迹象，但他表示，BMKG 的其他仪器记录到午夜至凌晨 4 点之间火山闪电和地磁扰动有所增加，尽管这两者都不如 9 月 4 日第一次喷发时那么强烈。

关于海况，BMKG代理气象副局长安德里·拉姆达尼表示，表层洋流主要向西南方向流向印度洋，流速在0.4至0.9节之间，浪高在0.3至1.2米之间。

展望未来，他表示，预计 9 月 8 日至 13 日巽他海峡的浪高将在 0.5 米至 2.0 米之间，预计喀拉喀托之子火山和海峡附近天气晴朗或多云。

安德里表示，自 9 月 4 日首次喷发以来，印尼气象、气候和地球物理局 (BMKG) 已发布了 39 条航空重要气象信息 (SIGMET) 警告，最新警告显示火山灰已升至 15,000 英尺（4,572 米）高空，并以 15 节的速度向西移动，朝向苏门答腊岛和印度洋。

他说：“根据上午9点向日葵9号卫星图像的分析，风向总体上将喀拉喀托之子火山的火山灰向西吹。”——马新社

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