The Philippine Institute of Volcanology and Seismology (Phivolcs) announced a reduction in offshore seismic activity in Ilocos Sur during a recent briefing. Despite the decline, Phivolcs Director Teresito Bacolcol emphasized the importance of staying vigilant against earthquake risks across the Philippines. The number of earthquakes has significantly dropped, with only one recorded in the last 24 hours, compared to a peak of 70 on December 19.
Bacolcol highlighted that the movement along the Manila Trench near Santa Catalina, Ilocos Sur, has lessened over the past five days. However, he warned that movements in the Manila Trench could potentially trigger not only a significant earthquake but also a devastating tsunami, with waves reaching up to 10 meters in some areas. He stressed the importance of recognizing signs of an impending tsunami, such as intense shaking, a sudden drop in sea level, or a roaring sound from the sea, and advised immediate evacuation to higher ground if any of these signs are observed.
In response to the series of offshore quakes, the Office of the Civil Defense (OCD) has scheduled an urgent meeting to enhance tsunami preparedness. OCD Administrator and NDRRMC Executive Director Ariel Nepomuceno emphasized the need for clear communication of tsunami risks and advocated for a direct evacuation to higher ground rather than to traditional centers, which may not be safe during a tsunami.
The Department of the Interior and Local Government (DILG) has also called on local government units (LGUs) to remain alert and prepare for potential escalations in seismic activity. The DILG advised LGUs to activate their Disaster Risk Reduction and Management Councils, perform risk assessments, and implement essential preparedness measures as outlined in Operation L!STO manuals. They are also tasked with setting up evacuation routes, training response teams, and ensuring the availability of necessary resources and utilities.
The public, particularly those in coastal areas, are urged to stay informed about natural tsunami indicators and to move to safer, higher ground immediately if any signs are detected.