An earthquake strikes the Indonesian island of Ambon. It triggers a 100 m (330 ft) megatsunami which drowns over 2,300 people.

The 1674 Ambon earthquake occurred on February 17 between 19:30 and 20:00 local time in the Maluku Islands. The resulting tsunami reached heights of up to 100 metres (330 ft) on Ambon Island killing over 2,000 individuals. It was the first detailed documentation of a tsunami in Indonesia and the largest ever recorded in the country. The exact fault which produced the earthquake has never been determined, but geologists postulate either a local fault, or a larger thrust fault offshore. The extreme tsunami was likely the result of a submarine landslide.

Ambon Island is part of the Maluku Islands of Indonesia. The island has an area of 743.37 km² (287.02 sq mi) and is mountainous, well watered, and fertile. Ambon Island consists of two territories: the city of Ambon to the south, and three districts (kecamatan) of the Central Maluku Regency to the north. The main city and seaport is Ambon, which is also the capital of Maluku province, while those districts of Maluku Tengah Regency situated on Ambon Island had a 2020 Census population of 128,069. By mid 2023 those populations were estimated to have become 354,052 and 128,754 respectively, resulting in an all-island population of 482,806.

A megatsunami is an incredibly large wave created by a substantial and sudden displacement of material into a body of water.

February 17 is the 48th day of the year in the Gregorian calendar; 317 days remain until the end of the year.