What are the active faults and trenches in Philippines?

What are the active faults and trenches in Philippines?

There are five active fault lines in the country namely the Western Philippine Fault, the Eastern Philippine Fault, the South of Mindanao Fault, Central Philippine Fault and the Marikina/Valley Fault System.

What are trenches in faults?

When geologists want to study an active earthquake fault, they often rely on a trenching study. They dig a long trench across the active trace of the fault, perhaps as much as 10 feet deep, or deeper if money and conditions allow. Geologists prefer to start this kind of work with a bulldozer.

What do you mean by active fault?

A fault that is likely to have another earthquake sometime in the future. Faults are commonly considered to be active if they have moved one or more times in the last 10,000 years.

What are active faults examples?

We can compare it to current examples of great thrust faults that are now active: Offshore of Japan, Offshore of the Pacific Northwest US, The Himalayas, The Andes and Central America, most along the Ring of Fire.

What is fault and types of fault?

A fault is a fracture or zone of fractures between two blocks of rock. Faults which move horizontally are known as strike-slip faults and are classified as either right-lateral or left-lateral. Faults which show both dip-slip and strike-slip motion are known as oblique-slip faults.

Where are trenches formed?

Trenches are long, narrow depressions on the seafloor that form at the boundary of tectonic plates where one plate is pushed, or subducts, beneath another.

What is difference between an active and inactive fault?

Active faults are structure along which we expect displacement to occur. Inactive faults are structures that we can identify, but which do no have earthquakes.

What are faults types?

Different types of faults include: normal (extensional) faults; reverse or thrust (compressional) faults; and strike-slip (shearing) faults.

What are 3 types of faults?

There are three main types of fault which can cause earthquakes: normal, reverse (thrust) and strike-slip. Figure 1 shows the types of faults that can cause earthquakes. Figures 2 and 3 show the location of large earthquakes over the past few decades.