Earthquakes and Faults

• The country Philippines is located at the Pacific Ring of Fire thats why they get commonly hit by an earthquakes and eruption
• Pacific Ring of Fire - an arc around the pacific ocean where earthquake commonly hits
• An earthquake is the shaking movement of the ground caused by a sudden shift or slip on a fault.
• A fault is a break in the rocks that make up the earth's crust.
• tectonic plates are always moving but they stuck at their edges due to friction.
• Normal fault is formed by tensional stress where hanging wall moves down relative to the footwall (vertical).
• reverse fault is a fault where hanging wall moves up relative to the footwall
• Normal Fault is a fault formed by tensional stress
• Reverse Fault is a fault formed by compressional stress
• Strik-slip Fault is a fault where sides slip past each other. It is formed by shear stress
• Strike-slip faults are formed along in sliding/transform boundaries
• normal faults are formed along the divergent boundaries
• reverse faults are formed along the convergent boundaries
• Strike-slip fault

  
• normal fault

  
• reverse fault

  
• geological processes can be constructive and destructive these contain eruptions
• geological structure beautify the Earth
• Focus is below the earths surface and it is where the earthquake originates
• faults are narrow zones that separates blocks of crust
• Active faults show movement in the recent decades and can become a source of another earthquake near the future
• inactive faults are identified narrow zones, but does not have any record of movement for the past centuries
• The strength of an earthquake and the damages and destruction it causes can be determined in terms of intensity and magnitude
• magnitude is a measure of the energy release at the source
• intensity measures the strength of shaking produced by the earthquake, as observed by the people at a certain location
• Seismologists are people who studies about earthquake
• Geo means Earth