Shallow M5.9 earthquake hits southeast Indian Ridge (Updated)
An M5.9 earthquake was recorded at 20:53 UTC on October 31, 2025, along the southeast Indian Ridge. The event occurred at a shallow depth of 10.0 km (6.2 miles), based on USGS data.
The coordinates for the epicenter were 96.9°E, 45.3°S, placing the quake well offshore in the tectonically active Southeast Indian Ridge region. No populated landmasses are situated near these coordinates, and thus no communities were in immediate proximity to the event.
Given its open-ocean setting, there is no critical land-based infrastructure such as airports, major seaports, highways, or energy facilities near the earthquake’s epicenter.
There is no tsunami threat associated with this earthquake, based on its location and available data.
USGS issued a green alert for this event, indicating a low likelihood of casualties or damage. The maximum estimated intensity was 0. The significance index is 536 (on a scale that runs through 1 000), based on magnitude, felt reports, and estimated impact.
The southeast Indian Ridge is a divergent plate boundary between the Indo-Australian Plate and the Antarctic Plate, known for frequent moderate- to strong-magnitude earthquakes related to seafloor spreading processes.
This information was last updated at 17:09 UTC on November 1, 2025.