The earthquake, which occurred on the New Guinea Trench, had a moment magnitude of 8.2 and a maximum Mercalli intensity of IX (Violent).

The tsunami also affected parts of nearby islands, including Yapen, Owi, and Pai, where waves of 4–7 m (13–23 ft) were measured.

[6][17][18] Roughly five minutes after the shaking, nearby residents heard an extraordinarily loud sound, such as one from an airplane, which they understood as a signal that a large wave was approaching.

This does not align with a traditional shallow earthquake rupture tsunami, which further lends credence to the theory of a submarine landslide in the area near Madori.

[21] Some time after, the government, army, and Red Cross evacuated affected individuals, distributed aid, and constructed a mass kitchen for 1,000 residents.

Transportation was a challenge as bad weather and high waves stopped boats from being able to effectively deliver relief.

[22] The Ministry of Social Affairs later delivered a further US$15,486 of food, 34 tons of rice, and "other immediate relief items".

An additional US$192,000 was provided to cover the costs of airlifting tents, water tanks, generators, carpentry kits, and medical equipment, and another US$200,000 to help locals buy relief items.

[23] USAID donated US$265,486 for housing (plastic sheeting, tents, blankets), US$10,000 to help with distributing relief as well as a two-member assessment team.