SEISMICITY

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A detailed geological study was conducted by Dr. Arthur Saldivar-Sali, a consulting engineering geologist, to delineate high and low seismic risk areas from a foundation engineering perspective. An extensive foundation drilling and soil tests of the Metro Manila area were conducted and based on the results of these tests, Metro Manila could be divided Into zones of varying vulnerability to ground-shaking induced by high intensity earthquakes.

The zonal classifications are defined by the types of soil or rock material present, the depth of the adobe bedrock (or thickness of the soil) which in turn controls the resonance of swaying of a structure, specially high rise building. The very high risk category is assigned to areas underlain by very thick layers greater than 15 meters) of soft clay or loose sand such as those found at the mouth of the Pasig River and Marikina River. Very low risk areas are those where the adobe bedrock is exposed or covered by no more than a couple of meters of soil.

COMPARATIVE SEISMICITY RISK LEVEL

Very Low Risk Zones
Low Risk Zones
High Risk Zones
Very High Risk Zones
Caloocan Pasy City South East Downtown Manila, Quiapo, Intramuros, Sta Cruz
East Sampaloc Marikina Binondo, Port Area
Malabon Pandacan Ermita Reclamation Area Along Roxas Blvd
Valenzuela East Marikina Malate Pasig
Novaliches .. Navotas Pateros
Quezon City .. South Marikina East Taguig
San Juan .. .. Coastal Town of the Marikina Valley Plain
Mandaluyong .. .. ..
Makati .. .. ..
Paranaque .. .. ..
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