Residents in parts of Antique province experienced mild ground shaking on the afternoon of June 6, 2026, after a shallow tectonic earthquake measuring Magnitude 4.5 struck offshore waters west of the province. The Philippine Institute of Volcanology and Seismology under the Department of Science and Technology (PHIVOLCS-DOST) issued a bulletin confirming the event and assuring the public that neither structural damage nor aftershocks are anticipated.
Earthquake Details and Location
According to PHIVOLCS-DOST, the earthquake was recorded at 5:07 PM Philippine Standard Time (PHT) on Saturday, June 6, 2026. The agency classified it as a Magnitude 4.5 (Mw) tectonic earthquake — meaning the event was caused by natural movement along fault structures rather than volcanic activity.
PHIVOLCS-DOST placed the epicenter at coordinates 10.19°N, 121.57°E, which positions it approximately 48 kilometers south-southwest of Anini-y, Antique. The earthquake originated at an extremely shallow depth of only 3 kilometers beneath the surface — a factor that can amplify how strongly shaking is felt at ground level, even for relatively moderate-magnitude events.
The epicenter lies in the offshore waters to the west of the Antique coastline. PHIVOLCS-DOST made an epicentral map available alongside its official bulletin to help the public understand the geographic scope of the event.
How the Shaking Was Felt Across Antique
Using the PHIVOLCS Earthquake Intensity Scale (PEIS) — the country's official standard for measuring how strongly an earthquake is felt at a given location — the agency recorded varying intensity levels across affected municipalities in Antique province.
Reported Intensities (Human Observations)
Based on reports gathered by PHIVOLCS-DOST, Intensity II was felt in both Anini-y and San Jose de Buenavista, the provincial capital of Antique. Under the PEIS classification system, Intensity II denotes faint shaking — perceptible to a small number of people, particularly those who are at rest or in elevated floors, with vibrations described as similar to those caused by a passing light vehicle.
Instrumental Intensities (Sensor Data)
PHIVOLCS-DOST's network of seismic monitoring instruments provided a more detailed picture of the earthquake's reach across the province. Instrument readings recorded the following intensity levels:
- Intensity II — San Jose de Buenavista, Antique
- Intensity I — Anini-y, Culasi, and Valderrama, Antique
As the agency defines it, Intensity I on the PEIS is scarcely perceptible to people — registered by seismic equipment but generally not noticed by individuals going about their daily activities. The difference between the reported and instrumental readings in Anini-y suggests that while instruments detected slight movement, the majority of the town's residents likely did not feel the quake in any significant way.
No Damage, No Aftershocks Forecast
PHIVOLCS-DOST stated in its official bulletin that the June 6 earthquake is not expected to cause any damage to structures or infrastructure in the affected areas. The relatively moderate magnitude, combined with the offshore epicenter location, limits the potential for destructive shaking on land.
Furthermore, the agency assessed that no aftershocks are anticipated following this event — providing additional reassurance to residents in Antique who may have been alarmed by the shaking. PHIVOLCS-DOST also noted that this particular bulletin would serve as the sole official communication for the event, unless new or significant information emerges that warrants a follow-up report.
Bulletin Issuance and Public Advisory
The official earthquake bulletin for this event was released by PHIVOLCS-DOST at 10:58 PM PHT on June 6, 2026, several hours after the earthquake occurred. The bulletin was prepared by the agency's on-duty seismologists as part of standard monitoring and public information protocols.
PHIVOLCS-DOST reminded the public to rely on verified and official sources when seeking earthquake information. The agency's website at phivolcs.dost.gov.ph serves as the primary platform for up-to-date seismic bulletins, earthquake advisories, and intensity maps covering the entire country.
Background: Antique and Seismic Activity
The western coast of the Visayas island group, where Antique is located, sits within a seismically active zone influenced by various tectonic structures in the region. Shallow earthquakes such as the one recorded on June 6 are not uncommon in these waters, and monitoring agencies like PHIVOLCS-DOST maintain round-the-clock observation to promptly assess and communicate any risks to the public.
Residents are always encouraged to be familiar with earthquake preparedness measures and to stay informed through official channels. In the event of stronger shaking in the future, PHIVOLCS-DOST advises the public to Drop, Cover, and Hold On, move away from hazardous objects, and wait for official guidance before re-entering buildings that may have been affected.
For continuous updates on seismic events across the Philippines, PHIVOLCS-DOST's official website and verified social media accounts remain the most reliable sources of information for both residents and local government units.
Source: PHIVOLCS-DOST official earthquake bulletin, June 6, 2026