Earthquake · Reviewed by USGS

M4.5 earthquake 158 km ESE of Biak, Indonesia

A magnitude 4.5 earthquake struck 158 km ESE of Biak, Indonesia at Sep 4, 2025, 19:48 UTC, at a depth of 27 km. The epicentre was 158 km (98 mi) ESE of Biak.

Details

Magnitude	4.5 mb
Time	Sep 4, 2025, 19:48 UTC
Depth	27.4 km
Coordinates	-1.815, 137.355
Felt reports	0
Tsunami flag	None
Source	USGS event page

Fig. 1The epicentre and other earthquakes within 100 km, since the day before

01 — Nearby

Nearest cities

Biak158 km (98 mi)
Mulia223 km (138 mi)
Tiom264 km (164 mi)
Nabire268 km (167 mi)

02 — Around it

Other earthquakes within 100 km

Other earthquakes within 100 km since the day before this event
Magnitude	Location	Distance	Depth	Time
4.1	230 km ESE of Biak, Indonesia	72 km / 45 mi	depth 25 km	Mar 6, 16:09 UTC

USGS can revise magnitude and location after the first report. See magnitude vs intensity and aftershocks.