Sangihe Island sits at the northern tip of Indonesia’s Sulawesi chain, closer to the Philippines than to Jakarta, and nearly everything on it exists in the shadow of Mount Awu. On May 19, 2026, at 1:00 p.m. local time, Indonesia’s Center for Volcanology and Geological Hazard Mitigation (PVMBG) raised Awu’s alert to Level 3 on the country’s four-tier scale, the second-highest designation. The move followed a burst of fresh seismic tremors beneath the 1,320-meter stratovolcano and came just two days after monitoring reports still listed the mountain at Level 2.
Level 3 is not a theoretical warning. It restricts all access within a defined radius of the summit, triggers government evacuation protocols, and signals to international agencies that an eruption is plausible in the near term. For the communities that farm, fish, and live on Awu’s slopes, the speed of the escalation is the most unsettling part: conditions shifted fast enough that PVMBG judged the risk had fundamentally changed within 48 hours.
A volcano with a brutal history
Awu has killed more than 8,000 people across its recorded eruption history, a toll stretching back to the 1600s, according to the Smithsonian Institution’s Global Volcanism Program. That places it among the deadliest volcanoes in an archipelago that contains more active volcanoes than any other country on Earth.
The worst single disaster came in 1856, when a major eruption sent pyroclastic flows and lahars racing down the mountain’s flanks and killed roughly 2,800 people on Sangihe. Another eruption in 1966 claimed more than 30 lives despite a smaller eruption size, a reminder that even moderate events on a densely settled island can be lethal. The pattern across centuries is consistent: Awu produces explosive eruptions capable of generating fast-moving flows of superheated gas and rock, along with volcanic mudflows that funnel down river valleys toward coastal villages.
What the seismic data shows
The Smithsonian’s activity report covering the period through late April 2026 documented both deep and shallow volcanic earthquakes beneath Awu while the alert still stood at Level 2. Deep volcanic quakes typically indicate magma or pressurized fluids moving at depth. Shallow events suggest that pressure is building closer to the surface. When PVMBG elevated the alert on May 19, the agency was signaling that the seismic pattern had crossed a threshold consistent with an increased probability of eruption.
Detailed daily seismic counts and real-time seismic amplitude measurements (RSAM) have not been published in English-language sources as of late May 2026. Nor have deformation data, such as GPS or tilt readings that would show whether the volcanic edifice is swelling, or gas emission figures for sulfur dioxide and carbon dioxide. Those datasets likely exist within PVMBG’s internal monitoring network but have not yet surfaced in the agency’s public summaries or in the Smithsonian’s compiled reports. Without them, outside volcanologists cannot independently confirm how rapidly magma may be ascending.
Tens of thousands in the hazard zone
Sangihe Island is home to roughly 130,000 people, and the island’s geography concentrates settlement on and around Awu’s lower slopes. Official volcanic hazard maps for Awu, archived by Australia’s National Library, delineate danger zones based on eruption history and flow modeling. Those maps were drawn from older census layers, and Sangihe’s villages have grown and shifted since they were drafted, so precise population counts inside the current exclusion perimeter are not available from any single public source.
What is clear is that the number of people living within reach of Awu’s most dangerous hazards, pyroclastic flows, lahars, and heavy ashfall, runs into the tens of thousands. The island has limited road infrastructure and relies heavily on sea transport, which complicates any large-scale evacuation. Elderly residents, young children, and people with disabilities face particular logistical challenges if an evacuation order comes with little lead time.
What Level 3 means in practice
Indonesia’s four-tier alert system moves from Normal (Level 1) through Advisory (Level 2) and Watch (Level 3) to Warning (Level 4). Level 3 establishes a formal exclusion zone around the summit, typically several kilometers in radius, and bars entry into river valleys on the volcano’s flanks where lahars could travel. It also triggers coordination between PVMBG, the national disaster agency (BNPB), and local emergency offices.
Only Level 4, the highest tier, constitutes a direct eruption warning and typically accompanies or immediately precedes an eruption in progress. The gap between Level 3 and Level 4 can close quickly. When Mount Ruang, another volcano in the Sangihe island chain, erupted explosively in April 2024, the alert escalation from elevated unrest to full eruption unfolded over a matter of days, forcing the evacuation of more than 12,000 people from nearby Tagulandang Island.
Gaps in the public record
As of late May 2026, no public statements from Sangihe’s local disaster management office have appeared in the institutional sources reviewed for this report. Whether evacuations have begun, how many emergency shelters are open, and what transportation has been arranged are all unanswered in English-language databases. Indonesian disaster agencies typically communicate through local radio, SMS alerts, village-level coordination, and Indonesian-language social media channels that do not surface quickly in international monitoring systems. The absence of those details in English does not mean the response is not underway.
PVMBG has also not published a press conference transcript or detailed technical bulletin beyond the summary data compiled by the Global Volcanism Program. That is not unusual for Indonesian volcanic crises at this stage, but it leaves a gap for anyone trying to assess the situation from outside the country.
What residents and observers should watch for
For people on Sangihe Island, the guidance tied to Level 3 is direct: stay out of the exclusion zone, avoid river valleys on Awu’s flanks, keep essential documents and emergency supplies ready to move, and follow instructions from village leaders and PVMBG rather than relying on social media speculation. Any further escalation to Level 4 would likely come with an immediate evacuation order for communities closest to the summit.
For observers tracking the situation from outside Indonesia, the most reliable sources remain PVMBG’s official alert page and the Smithsonian’s Global Volcanism Program, which logs alert changes, ash advisories, and eruption reports as they are confirmed. The core facts as of late May 2026 are limited but serious: a volcano responsible for thousands of deaths over the centuries has moved to its second-highest alert level in a rapid escalation, and the communities living on its slopes are now in a window where preparation and clear communication matter more than anything else.
More from Morning Overview
*This article was researched with the help of AI, with human editors creating the final content.
