PHIVOLCS Latest Tsunami Bulletin

Tsunami WarningA Tsunami is a series of sea waves commonly generated by under-the-sea earthquakes and whose heights could be greater than 5 meters. It is erroneously called tidal waves and sometimes mistakenly associated with storm surges. Tsunamis can occur when the earthquake is shallow-seated and strong enough to displace parts of the seabed and disturb the mass of water over it. Some natural signs of an approaching local tsunami include:

1) A felt earthquake.
2) Unusual sea level change: sudden sea water retreat or rise.
3) Rumbling sound of approaching waves. Continue reading

Earthquake Intensity Scale

Philippine Islands earthquake intensity scaleEarthquakes in the Philippines are classified into ten different intensity scales, with Intensity I being the lowest (weakest) measurable tremor, to Intensity 10 (the strongest). Because Philippines is a chain of islands located near the Pacific’s Ring of Fire, it’s a good idea to understand the intensity of quakes and be aware of possible tsunami prone areas. Continue reading