Earthquake

• Earthquake - A sudden shaking and trembling caused by a sudden release of energy from inside the earth
• Focus is where the earthquake begins. The point directly above the focus is the Epicenter, where the greatest damage take place
• Seismology - study of an earthquake
• seismologoist - a person who studies earthquakes
• PHIVOLCS (philippine institute of volcanology and seismology) - is the national agency that monitors and records volcanic activity
• Normal fault (divergent) - Earths crust are pulled apart, gravity causes one section to move downward in relation to other
• Reverse fault (convergent) - Earths crust are squeezed together, force pushed one section upward in relation to the other
• Strike-slip fault (transform) - rock layers on opposite side of a fault slides past each other horizontally
• Friction - resistance to motion of one object moving relative to another
• Stick and slip - everytime a fault slips or moves, the earth quakes
• Richter scale - measure of an earthquake's intensity based on its magnitude
• Seismograph - measures ground vibrations caused by earthquakes
• Magnitude - how big an earthquake is measured by the amount of energy released during the event
• Seismic waves - energy released by an earthquake that travels through the ground as vibrations
• Epicenter - point directly above where the earthquake started