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A 8.0 or 7.9 earthquake struck 11 km west of Komo, Highlands Province, Papua on 26 February 2018.

Tectonic setting
The primary tectonic feature of the 1200 km island chain is the New Hebrides Subduction Zone, the convergent boundary of the Indo-Australian and Pacific Plates. Along the Wadati–Benioff zone, earthquake activity has been observed as shallow, intermediate, and deep-focus events at depths of up to 700 km. Volcanic activity is also present along this north-northwest trending and northeast-dipping oceanic trench.

While much of the island arc experiences intermediate-depth earthquakes along a Wadati–Benioff zone that dips steeply at 70°, the area adjacent to the d'Entrecasteaux Ridge does not. There is a corresponding gap in seismicity that occurs below 50 km where it intrudes into the subduction zone from the west. According to the NUVEL-1 global relative plate motion model, convergence is occurring at roughly 8 cm per year. The uncertainty, which also affects the Tonga arc, is due to the influence of spreading at the North Fiji Basin.

Highlands
In Tagali, 150 people were killed, 489 others were injured and 2,992 homes were destroyed. At least 122 people were killed and 2,095 others were injured in Mount Bosavi, where 4,052 houses were destroyed and 65,948 more were damaged; over 80% of houses collapsed in 76 villages.

At least 5,001 deaths and 30,568 injuries occurred in Koroba, with 25,829 houses, 28 villages and the towns of Hanoi and Geroro destroyed. Of the fatalities, 2,679 occurred in Egele, where 13,453 of the 15,670 houses were destroyed.

At least 187 people were killed, 345 others were injured, 1,518 buildings collapsed and 2,161 others were damaged in Wabag. The pagoda of Wabag Temple partially collapsed. About 520 m of a gas pipeline exploded in the city, destroying houses or leaving them engulfed in flames. The city hall, 10 bridges and two shopping malls were also damaged. Landslides caused 148 deaths in the city, and destroyed hundreds of houses in three villages surrounding the city.

Sandaun
Sixteen people were injured, five houses collapsed and 21 others were damaged in Aitape. A two-story building in the city caught fire due to a power outage, burning it until it collapsed.

East Sepik
One person was killed and seven others were injured in Wewak, where four buildings were destroyed and seven others were damaged. In Hunstein, two people were killed, 11 others were injured, 800 houses were destroyed and 30,000 more were damaged. Another 2,000 houses were damaged in Karawari.

Madang
One person died of a heart attack and several old houses were damaged in Madang. In Yawar, one person died of a heart attack, 10 houses, three schools and three hospitals were damaged, and rockfalls occurred.

Fly
In Daru, 238 people were injured, mostly due to fallen objects, and 50 buildings were damaged. The entire city lost electricity due to a power outage that lasted for 40 minutes. The Dorogari District Hospital was significantly damaged, forcing patients to be evacuated.

Moresby
In Port Moresby, 67 people were injured, one building collapsed and two others were damaged. Ten people were injured and one building collapsed in Kairiku District. There, a pedestrian bridge collapsed onto a bus. In the city center, 57 people were injured, four houses collapsed and 34 others, a mall, a gymnasium and a building in the city's port were all damaged.

New Britain
One person was injured each in Kandrian and Kokopo.