A magnitude 4.4 earthquake struck waters off Aurora province early Monday morning, causing light shaking in several coastal municipalities but posing no threat of damage, the Philippine Institute of Volcanology and Seismology (PHIVOLCS-DOST) reported.
Earthquake Details
The tectonic earthquake occurred at 5:07 AM Philippine Standard Time (PHT) on April 21, 2026, with its epicenter located 19 kilometers southwest of Dinalungan, Aurora. The temblor originated at a relatively shallow depth of 12 kilometers beneath the sea floor at coordinates 16.1°N, 121.79°E.
Shaking Intensity Reports
According to PHIVOLCS instrumental readings, the earthquake produced Intensity II shaking in Casiguran, Aurora, which corresponds to a slightly felt tremor that may be noticed by sensitive individuals or those at rest. Weaker Intensity I shaking was detected in Baler and San Luis, also in Aurora province, representing barely perceptible movement typically felt only under favorable circumstances.
No Damage or Aftershocks Expected
PHIVOLCS assessed that the earthquake will not cause damage to structures or property. The agency also determined that aftershocks are not expected to follow this seismic event.
The earthquake bulletin, issued at 6:28 AM PHT, represents PHIVOLCS' complete assessment of the event. The agency indicated this would be the only bulletin released unless additional information becomes available.
Tectonic Origin
PHIVOLCS classified the earthquake as tectonic in origin, meaning it resulted from the movement of rock masses along fault lines or fractures in the Earth's crust, rather than volcanic activity.
Monitor official PHIVOLCS updates at phivolcs.dost.gov.ph.