The region is situated where the Philippine Sea Plate is sandwiched ... when the rocks in this particular fault zone are squeezed, they don't deform much in the other direction.

A restive volcano in central Philippines has briefly erupted, spewing a 2.8-mile ash plume and debris into the sky ...

Scientists have known that the shape and makeup of a fault zone—the rock types, temperature, water content, and even the slope of the sinking plate—all help define how and where a tremor happens.

6.6 earthquake along the nearby Masbate segment of the Philippine Fault Zone,” it explained. Also, Phivolcs said that the sulfur dioxide or SO2 emission from the volcano’s summit vents has ...