A powerful 6.7-magnitude earthquake struck Indonesia’s central island of Sulawesi on Tuesday morning, triggering widespread panic in regions previously devastated by major seismic disasters. According to the United States Geological Survey (USGS), the epicentre of the quake was located approximately 42 kilometres south-east of the coastal town of Palu, striking at a shallow depth of 10 kilometres.

The main tremor, which occurred at 10:27 am local time (8:57 am IST), caused violent shaking that lasted for over a minute. It was immediately followed by a strong 5.2-magnitude aftershock just minutes later, sending panicked residents fleeing out of residential complexes and medical facilities into open streets.

Aftershocks trigger hospital evacuations

Ground reports from Palu and the neighboring Sigi regency indicate that the intensity of the shaking caused visible panic across major urban centers. At the main provincial hospital in Palu, administrative staff quickly executed emergency protocols, evacuating dozens of patients on mobile stretchers and wheelchairs into the open parking lots out of fear of structural collapses.

Local authorities confirmed that while structural tremors shook ceiling panels and shattered glass windows in several commercial buildings, no immediate casualties or severe structural collapses have been officially reported. Emergency response teams have been deployed to assess remote areas closer to the epicentre.

No immediate tsunami threat

Despite the high magnitude and shallow depth of the underwater fault lines, Indonesia's Meteorology, Climatology, and Geophysics Agency (BMKG) issued a statement confirming that the tremor did not pose a tsunami threat to the coastal bay.

"Initial data analysis indicates there is no potential for displacement of water columns capable of triggering a wave sequence," an agency official stated during a midday briefing. However, coastal communities have been advised to remain alert as secondary aftershocks continue to register across Central Sulawesi's fault network.

Memories of 2018 disaster return

The sudden nature of Tuesday’s earthquake has revived deep-seated trauma among the local population. Palu was the site of a catastrophic 7.5-magnitude earthquake in September 2018, which triggered a massive 3-metre-high localized tsunami and catastrophic soil liquefaction.

That disaster claimed over 4,000 lives and swallowed entire suburban neighborhoods whole as the ground turned to quicksand. Local news channels broadcasted footage of residents standing on roadsides, desperately calling relatives to confirm their safety while refusing to re-enter their homes.

History of regional seismic vulnerability

Sulawesi has remained highly vulnerable to frequent tectonic adjustments over the last decade. In January 2021, a relatively lower 6.2-magnitude earthquake struck near the city of Mamuju on the same island, killing at least 100 people and displacing tens of thousands who slept outdoors for weeks.

Geological experts point out that the continuous stress buildup along the local fault systems makes Central Sulawesi one of the most seismically volatile zones in the Indonesian archipelago.

Living on the Ring of Fire

Indonesia sits directly atop the Pacific "Ring of Fire", a vast horseshoe-shaped arc of intense seismic and volcanic activity where multiple continental and oceanic tectonic plates collide. The constant grinding of the Indo-Australian plate against the Eurasian plate regularly unleashes massive releases of underground energy through the earth's crust.

As rescue teams continue their preliminary assessment loops, regional disaster management units have set up temporary transit camps in Palu to accommodate citizens who are hesitant to return indoors before nightfall.