By Ephraim Aguilar
Southern Luzon Bureau
First Posted 13:23:00 08/18/2008
Inquirer.net
LEGAZPI CITY, Philippines--Another aftershock rocked areas of the Bicol region early Monday morning, following Friday evening’s earthquake and the first aftershock on Sunday afternoon.
The 5.2-magnitude earthquake, at 4:46 a.m., was felt at Intensity 4 in Virac, Catanduanes, Intensity 3 in Sorsogon City and Legazpi City, and Intensity 2 at the Mayon Volcano Observatory on Ligñon Hill in Daraga, Albay, reports from the Philippine Institute of Volcanology and Seismology said.
State seismologists plotted the earthquake at around 34 kilometers north and 69 degrees east of Sorsogon province.
On Friday, a 5.1-magnitude earthquake hit Albay, Sorsogon, and Camarines Sur provinces and was felt strongest in Legazpi City at Intensity 6.
An aftershock was also felt 2:28 p.m. Sunday in Sorsogon and Albay provinces.
Alex Baloloy, senior science research analyst of Phivolcs-Bicol explained that the earthquakes were tectonic in origin.
Magnitude measures the seismic energy unleashed by the earthquake. An earthquake with a magnitude 5.1 is moderate, while that with a magnitude 3.9 or 3.2 is considered minor.
Intensity describes the strength of the quake based on observable effects on the ground.
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