Geological Hazards

Geological Hazards

• adverse geologic condition capable of causing damage or loss of property or life.

Rainfall - Induced landslide

• caused by heavy rain due to storms, it is the sliding down of soil, rocks, or mud from elevated place.

Failure

• When land falls (According to PHIVOLCS 2018)

• There are various types of failure:

• Fall - part of the slope falls down

• topple - segments tumbling down

• Slide - slides down and digs deep

• Flow - Flows down like a fluid

Sinkholes

• Is depression in the ground that has no natural external surface drainage, when water dissolves surface rock, a hole is formed.

Dissolution Driven

• Happens when there’s little ground cover over the bedrock water seeps through existing holes and start moving through the bedrock.

Cover - Collapse

• Most dramatic type of sinkhole

• they occur when the ground above the bedrock is mostly clay, which breaks and falls into the cavities.

Cover - Subsidence (Hourglass effect)

• begins when a layer that allows water to pass covers an area filled with sand.

• this sand spills into the empty spaces in the bedrock, causing the ground above to sink.