A magnitude 4.9 earthquake struck 54 kilometers southeast of Palu, Sulawesi Tengah, on Wednesday, June 17, 2026, according to the BMKG. The shallow tremor, which originated at a depth of 11 kilometers, resulted from active fault movement and was felt across several regions, though authorities report no damage and confirmed no tsunami threat.
The earthquake was identified as a normal fault event, with the BMKG monitoring a total of 354 aftershocks, including a larger M 5.2 event, following an initial M 6.7 earthquake that occurred in the region on June 16, 2026.
What caused the seismic activity?
The earthquake was a shallow event caused by the movement of an active fault, specifically a “normal fault” mechanism, according to Wijayanto, Director of Earthquakes and Tsunami at the BMKG. The epicenter was located at 1.11° South Latitude and 120.32° East Longitude. BMKG officials initially recorded the event as a magnitude 5.1 before updating the parameter to 4.9.
How widespread was the impact?
Residents across several districts reported feeling the tremor, with varying intensities recorded on the Modified Mercalli Intensity (MMI) scale. The highest intensity of V MMI was reported in Balinggi, Parigi Moutong, followed by IV-V MMI in Palolo, Sigi, and Torue. Lower intensities of II-III MMI were felt in Palu, while residents in Donggala and Pasangkayu experienced II MMI. Despite these reports, the BMKG has received no reports of structural damage, and modeling confirms the event poses no tsunami risk.
The high frequency of aftershocks—354 events recorded by 2:00 WIB—following the primary M 6.7 tremor on June 16 suggests an ongoing period of crustal adjustment. While officials emphasize that there is no tsunami threat, the persistence of these tremors requires consistent monitoring of localized ground acceleration to ensure infrastructure stability in affected areas.
What happens next?
The region is currently in a period of heightened seismic activity following the initial M 6.7 earthquake. Analysts expect that aftershocks will continue, as the BMKG has already logged hundreds of such events since the primary quake. Residents are advised to remain calm and disregard unverified information regarding the situation.
Frequently Asked Questions
Is there a risk of a tsunami from this earthquake?
No. The BMKG’s modeling indicates that the earthquake does not have the potential to trigger a tsunami.
Are there reports of damage to buildings or infrastructure?
As of the latest update, the BMKG has not received any reports of damage caused by the earthquake.
Is this a new, isolated earthquake?
No. According to the BMKG, this event is part of a series of aftershocks originating from an M 6.7 earthquake that struck the region on June 16, 2026.
How have local authorities in your area prepared for the possibility of continued aftershocks?
