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Sofia Pines

on 14 January 2014

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Magnitudes and Intensities of Earthquakes
a device called seismograph can measure the strength of an earthuake.
analyzing a seismogram enables the time, focus, and epicenter, as well as the amount of energy released by the movement of the rock masses.
The strength of an earthquake is expressed in 2 ways -
the PFZ is comparable to San Andreas Fault in California because on its geologic features, faulting and seismic characteristics.
the mean displacement rate is 2-3cm per year.
The Central Philippine Fault Zone
it is a transition zone with slow slip and creep activity.
it comprises the Guinyangan fault, Masbate fault, and the Central Luzon faut.
it is found to be the site and sources of fault creep activity, slow slip event, and great earthquakes in the archipelago.
it is a left lateralstrike and slip fault that transect the entire Philippine archipelago along a general strike of N 300 - 400W of northwestern Luzon to southern Mindanao.
it was renamed to West Valley Fault during the term of PHIVOLCS Director Raymundo Punongbayan because it caused panic to the residents of Marikina.
Seismologists said that once that fault moved, it can lead to the eruption of Taal Volcano.
according to PHIVOLCS, it is the most geologically active fault line the Philippines.
it has not moved to produce high intensity earthquake for at last 500 years.
it is located east of Metro Manila and cuts through all the modern and progressive portions of Manila, Rizal, Marikina City, Quezon City.
Marikina Valley Fault Line
the Ritcher scale, designed by Dr. Charles F. Ritcher of the California Institute of Technology, is the best-known logarithmic scale used in measuring the magnitude of earthquakes.
the magnitude of an earthquake is a measure of the amount of energy released as estimated from seismogram readings.
In the scale, each successive unit is ten times more powerful than the one before.
the modified Mercalli scale (complied by Guiseppe Mercalli in 1902) expresses the intensity of an earthquake as felt in a given location or region in values ranging from I to XII, which intensity 1 as the most feeble and intensity XII as the strongest and can cause total damage to property.
Earthquakes in the Philippines
Damages Caused by Earthquakes
it can cause massive landslides.
it can destroy property.
it can cause fire.
it can cause tsunami
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