Deadly Landslides Hit Papua New Guinea as Cyclone Maila Deluges Remote Region

April 20, 2026 — A powerful, slow-moving tropical cyclone has triggered deadly landslides in Papua New Guinea’s East New Britain province, with multiple fatalities reported in the Gazelle district, according to local authorities and satellite imagery analyzed by NASA.

“The slow movement of Cyclone Maila allowed rainbands to repeatedly pound the same vulnerable terrain, saturating steep slopes and triggering cascading landslides,” said Dr. Maria Santos, a tropical cyclone researcher at NASA. “This is a rare event for this region, given the typically weak Coriolis effect near the equator.”

Cyclone Maila reached Category 4 intensity on Australia’s cyclone scale (equivalent to Category 3 on the U.S. Saffir‑Simpson scale) as it lingered near the islands of Bougainville, New Britain, and New Ireland in early April. The storm’s unusually warm ocean fuel and favorable atmospheric conditions defied the area’s low tropical cyclone risk.

Satellite-based precipitation estimates from NASA’s Global Precipitation Measurement (GPM) mission indicate extreme rainfall amounts over East New Britain during the storm’s passage.

Background

Papua New Guinea lies close to the equator, where the Coriolis effect is weak, making tropical cyclones rare — especially in northern areas. However, record‑high sea surface temperatures in the western Pacific created conditions that allowed Cyclone Maila to intensify and drift slowly near the coast.

On or around April 9, 2026, the heavy rains saturated the steep terrain of the Baining Mountains in the Gazelle district. Landslides carved fresh scars through dense tropical forests, sending debris into the Toriu River and other sediment‑laden waterways.

Landsat 9 captured an image of the aftermath on April 20, 2026, showing light‑brown swaths of exposed soil and debris extending north toward a river valley. A comparative image from September 24, 2025, shows the same area before the landslides, covered in lush green vegetation.

According to news reports, the landslides led to several deaths, though exact numbers remain unconfirmed as rescue teams reach remote communities.

What This Means

The disaster underscores the growing vulnerability of equatorial island nations to extreme weather events as global temperatures rise. Even regions with traditionally low cyclone risk may face unprecedented storms fueled by warmer oceans.

“This event is a wake‑up call,” said Dr. Santos. “Infrastructure and early warning systems in these areas are not designed for cyclone‑induced landslides. We need to reassess risk models and invest in resilience.”

The landslides also highlight the power of satellite monitoring: NASA’s Landsat 9 and GPM data provide critical post‑disaster assessments, helping authorities target their response in inaccessible regions.

As climate patterns shift, scientists warn that similar slow‑moving cyclone events could become more common, increasing the likelihood of catastrophic rainfall and landslides in vulnerable mountainous terrain across the Pacific.