Magnitude 4.9 Earthquake Strikes Off Coast of Kalamansig
Kalamansig Philippines earthquake magnitude 4.9 January 2026
A moderate magnitude 4.9 earthquake rattled the waters southwest of Kalamansig, Sultan Kudarat, late Tuesday night, January 27, 2026. According to reports from PHIVOLCS and Indonesia’s Meteorology, Climatology, and Geophysical Agency (BMKG), the tremor occurred at 11:50 p.m. local time at a shallow depth of approximately 10 kilometers. The epicenter was located roughly 30 kilometers southwest of the coastal town, sending light shaking through nearby communities including Sangay and Bantogon. This latest seismic event is part of a significant earthquake swarm that has plagued the region since mid-January, with over 700 tremors recorded in the offshore Sultan Kudarat area over the last week alone.
While the magnitude 4.9 quake was strong enough to be felt by residents in the Soccsksargen region, no immediate reports of significant infrastructure damage or casualties have been issued by local disaster risk reduction and management offices. Seismologists noted that the shaking was likely felt as Intensity III or IV in Kalamansig and Lebak, while weaker vibrations were felt as far as Isulan and Koronadal City. The shallow nature of the quake—a characteristic of tectonic movements along the Cotabato Trench—often results in more pronounced surface shaking compared to deeper events. PHIVOLCS has maintained its advisory for residents in coastal areas to remain vigilant against localized sea-level changes, though no tsunami warnings were triggered by this specific magnitude.
The persistent seismic activity in the Celebes Sea has caused mounting anxiety among local populations, leading to the suspension of classes and government work in several Sultan Kudarat municipalities earlier this month. On Wednesday morning, just over an hour after the 4.9 tremor, a more powerful magnitude 5.7 earthquake struck in nearly the same location, further highlighting the volatility of the regional fault lines. Mayor Ronan Garcia of Kalamansig has called for intensified education and earthquake drills, stressing that while most of the quakes have been offshore, the frequency of the “swarm” suggests that residents must be prepared for more significant aftershocks in the coming days.
As of early Wednesday, January 28, emergency responders are continuing to monitor the stability of coastal dikes and public buildings following the back-to-back tremors. Scientific data suggests that the ongoing seismic activity is linked to the subduction of the Celebes Sea plate beneath the Mindanao block. While the magnitude 4.9 event itself is considered moderate, the cumulative effect of hundreds of smaller quakes has raised concerns regarding the long-term structural integrity of older buildings in the region. PHIVOLCS continues to provide real-time updates and urges citizens to rely on official bulletins to avoid the spread of misinformation during this active period.
