A fault is a fracture in rock where displacement has occurred due to movement of the Earth. There are three main types of faults defined by the direction of movement: normal faults create space by pulling rock apart; reverse faults squeeze rock by pushing two blocks on top of each other; strike-slip faults involve horizontal movement with little vertical displacement. Examples of fault systems in the Philippines include those near Laoag City, the Marikina Valley, near Borongan, and in General Santos City.

1. FAULTS
Faul

2. FAULTS
A fault is a planar fracture or
discontinuity in a volume of
rock, across which there has
been significant
displacement along the
fractures as a result of earth
movement.

3. FAULTS (DIPSLIP)
A Normal Fault
create space. Two
blocks of crust pull
apart, extending the
crust.

4. FAULTS (DIPSLIP)
Hanging Wall
Footwall
A Normal Fault
create space. Two
blocks of crust pull
apart, extending the
crust.

5. FAULTS (DIPSLIP)
Reverse faults, also
called thrust faults,
squeeze the crust,
pushing two blocks of
crust on top of each
other.

6. FAULTS (DIPSLIP)
Reverse faults, also
Hanging Wall
Footwall
called thrust faults,
squeeze the crust,
pushing two blocks of
crust on top of each
other.

7. FAULTS (DIPSLIP)
Strike-slip faults
indicate rocks are
sliding past each
other, with little to no
vertical movement.

8. FAULTS (DIPSLIP)
Top View
Strike-slip faults
indicate rocks are
sliding past each
other, with little to no
vertical movement.

9. FAULTS
Strike-slip faults
indicate rocks are
sliding past each
other, with little to no
vertical movement.

10. FAULTS
Strike-slip faults
indicate rocks are
sliding past each
other, with little to no
vertical movement.

11. FAULTS system in the
Philippines
LAOAG CITY

12. FAULTS system in the
Philippines
MARIKINA
VALLEY
FAULT
SYSTEM

13. FAULTS system in the
Philippines
Near
BORONGAN

14. FAULTS system in the
Philippines
GENERAL
SANTOS CITY