Geology Agency: Anak Krakatau Eruption Poses No Tsunami Risk, Fishermen Can Sail

Mount Anak Krakatau’s latest eruption does not pose a tsunami threat, Indonesia’s Geological Agency said, allowing fishermen to continue sailing as the volcano’s activity declines.

The agency said the eruption had entered a Strombolian phase, characterized by intermittent volcanic activity. Lana Saria, head of the Geological Agency under the Energy and Mineral Resources Ministry, said analysis showed no movement in the volcano’s walls that could trigger a landslide.

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In our analysis, including the deformation data, there is no movement of the wall that could potentially cause a landslide. We also see that the slope is shallow, so this will not trigger a tsunami.

That distinguishes the current eruption from the 2018 event, when part of the volcano collapsed and caused a tsunami. This time, the slopes are shallow and the agency has found no signs of a collapse that could displace seawater, Saria said.

Indonesia’s Meteorology, Climatology and Geophysical Agency also recorded no sea-level anomalies from Sept. 4 to Sept. 6, further indicating no tsunami potential. Saria said the possibility of another eruption remains open, but that does not mean the activity is growing stronger. She added that no technology anywhere can yet predict exactly when an eruption will occur or how extensive it will be.

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The possibility remains open, but it is not a basis for saying that the eruption is getting bigger. The possibility exists, but there is no technology that can determine when it will happen or approximately how extensive it will be. No country has equipment that can predict that.