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The Philippine Institute of Volcanology and Seismology (Phivolcs) has already recorded more than 500 aftershocks following the magnitude 5.5 earthquake
MANILA, Philippines (First published 4:10 p.m.) - A 5.6-magnitude earthquake shook Batangas and nearby provinces, seismologists said Saturday afternoon. Philippine Institute of Volcanology and Seismology traced the epicenter of the tremor at 2 kilometers northwest of Mabini, Batangas. The tremor, which occurred at 3:07 p.m in Mabini, Batangas, was felt at various intensities in nearby provinces and even in Metro Manila. It had a depth of 4 kilometers and was tectonic in origin. The quake was felt strongest in Mabini, Batangas, where Intensity VII was reported.
This was followed by a 5.9-magnitude quake south southwest of Tanauan, Batangas, the US Geological Survey reported.
Phivolcs warns Valley Fault residents MANILA, Philippines - Residents of Metro Manila and nearby provinces should prepare for the “Big One,” a magnitude 7.2 earthquake to be generated by the West Valley Fault, which is ripe for movement. Amid the devastation caused by the magnitude 6.7 earthquake in Surigao, the Philippine Institute of Volcanology and Seismology (Phivolcs) yesterday appealed to residents of Metro Manila and nearby provinces to prepare for a powerful earthquake that could kill thousands. “Everyone must learn from the recent effects of the magnitude 6.7 earthquake in Surigao del Norte. If a similar event happens in a highly urbanized area, the effects can be more devastating,” Phivolcs director Renato Solidum warned. State seismologists have repeatedly warned the public that the West Valley Fault is ripe for movement. Are you in a Metro Manila earthquake zone? The West Valley Fault, Solidum said, moves roughly every 400 years. The last major earthquake generated by this fault was in 1658 or 357 years ago. The 100-kilometer fault traverses parts of Bulacan through Quezon City, Marikina, Makati, Pasig, Taguig and Muntinlupa in Metro Manila; San Pedro, Biñan, Sta. Rosa, Cabuyao and Calamba in Laguna; and Carmona, General Mariano Alvarez and Silang in Cavite. A 2004 study funded by the Japan International Cooperation Agency for Phivolcs and the Metropolitan Manila Development Authority showed that the magnitude 7.2 quake could kill up to 34,000 people and injure 100,000 others due to collapsed buildings.