Liquefaction of Soil During Earthquakes
Abstract: The mechanism of an earthquake is very complex. The resultant liquefaction of soil is one of the prime causes of immense damage to life and property and has been discussed in the essay.

The author is Professor, Centre for Disaster Mitigation and Management, VIT University, Vellore. pijush.phd@gmail.com


Term Power

What is ...

These highways enable travel without stoppages which are usually caused by traffic signals, pedestrian crossings, intersections etc. There are designated entry and exit points from the expressway.

A high speed highway, also known as Federal Roadway. Most sections of the autobahn are without a blanket speed limit for motorcycles and cars. German and Austrian autobahns only accept motor vehicles that can obtain a speed of at least 60 kmph.

It is a structure on a waterfront where ships may dock during loading or unloading of freight or passengers. Also known as a wharf, the quay includes warehousing and docking facilities for ships. It is usually built parallel to the shoreline.

A calculation of the number of vehicles or pedestrians per unit of time at a given reference point.

This type of gauge of more than 5 ft is used almost all over India. It is the widest gauge used in the whole world.

Its primary use is in road construction. Also known as bitumen, it can be found as a natural deposit. Concrete is the other material used for road construction.

It is the unit for measuring the speed of a vessel on water. 1 knot = 0.514444444 m / s. The term ‘knot’ is derived from the use of a rope with knots, and a log to measure speed on the water. The number of knots that passed over the ship in 30 seconds gave the speed.

Denoted by alternate black and white strips, it gives the right of passage to pedestrians. The strips are parallel to the flow of traffic.

Changing the proportion of the numbers of trips using different means of travel e.g. from car use to walking.