Figure 3 Infrastructure damage, observed in Marcos town, Ilocos Norte province, located around 35 kilometers (21 miles) to the northwest of the epicenter of the October magnitude-6.4 earthquake. (a) Residential building collapsing toward the front; (b) View from the front of the collapsed building shown in photo (a), showing shear failure of columns: Note the 2nd floor already hugging the ground after the total collapse of the 1st floor; (c) Tilting to one side of an unfinished warehouse due to column and wall failure, and differential settlement of poorly consolidated subsurface; (d) Column damage on a government building due to shear failure and poor quality of concrete mixture (crumbles on slight hammer tap). Photo credits: S.C. Aurelio.

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Figure 3 Infrastructure damage, observed in Marcos town, Ilocos Norte province, located around 35 kilometers (21 miles) to the northwest of the epicenter of the October magnitude-6.4 earthquake. (a) Residential building collapsing toward the front; (b) View from the front of the collapsed building shown in photo (a), showing shear failure of columns: Note the 2nd floor already hugging the ground after the total collapse of the 1st floor; (c) Tilting to one side of an unfinished warehouse due to column and wall failure, and differential settlement of poorly consolidated subsurface; (d) Column damage on a government building due to shear failure and poor quality of concrete mixture (crumbles on slight hammer tap). Photo credits: S.C. Aurelio.

Figure 3 Infrastructure damage, observed in Marcos town, Ilocos Norte province, located around 35 kilometers (21 miles) to the northwest of the epicenter of the October magnitude-6.4 earthquake. (a) Residential building collapsing toward the front; (b) View from the front of the collapsed building shown in photo (a), showing shear failure of columns: Note the 2nd floor already hugging the ground after the total collapse of the 1st floor; (c) Tilting to one side of an unfinished warehouse due to column and wall failure, and differential settlement of poorly consolidated subsurface; (d) Column damage on a government building due to shear failure and poor quality of concrete mixture (crumbles on slight hammer tap). Photo credits: S.C. Aurelio.

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