Faults

• Fault - a fracture or break in Earth’s crust where earthquakes are most likely to occur repeatedly.
• Fault zone - series of associated faults spread over in area
• Stress - force applied to rocks
• 3 Types of Stress: Tensional stress, Compressional stress & Shear stress
• Tensional stress-rocks are stretched away from each other.
• Compressional stress - rocks are pushed toward each other
• Shear stress - rocks are pushed perpendicular to the axis.
• 2 Types of Faults: Active Faults & Inactive Faults
• Active faults - faults that are generated earthquakes within the last 10,000 years and may still continue to do so
• Inactive faults – those without a record of having generated earthquakes within the last 10,000 years, but may possible generate an earthquake in the future
• Philippine Institute of Volcanology and Seismology (PHIVOLCS) - is a Philippine national institution dedicated to provide information on the activities of volcanoes, earthquakes, and tsunamis