Bali, Sumba and the Flores Islands are expected to be the worst hit from a megathrust earthquake in the Sumba fault
2-MIN READ2-MIN ListenSCMP’s Asia deskPublished: 4:15pm, 22 Apr 2026The magnitude 7.7 earthquake that hit Japan on Monday has renewed worries on Indonesia’s holiday island of Bali, which sits on the same Pacific Ring of Fire.Hours after the quake, the Japan Meteorological Agency issued a special advisory warning of a slightly elevated risk of a temblor with a magnitude of 8 or stronger in the coming days. It said there was a 1 per cent chance of a megaquake, compared with 0.1 per cent at other times.
Monday’s temblor came just days after the Bali Meteorology, Climatology, and Geophysics Agency (BMKG) issued a fresh round of warnings about the risk of a megathrust earthquake with a magnitude of 9.0 on the Richter scale hitting the island.
According to the US Geological Survey, megathrust happens when a stuck tectonic plate along a fault slips under its neighbour, resulting in giant earthquakes. Other more frequent smaller earthquakes also occur within the lower plate or the crust of the upper plate.
Bali, Sumba and the Flores Islands are expected to be the worst hit from a megathrust earthquake, according to The Bali Sun.
The BMKG, however, stressed that the warnings were a risk assessment rather than a prediction.
