Origin of earthquake
Related formspre·earth·quake, adjective
Examples from the Web for earthquake
In 1997, an earthquake in Assisi caused the collapse of the main cathedral and killed ten people.
The earthquake sparked a surge in religious belief in Japan.
It is a glimpse at life exactly as it was at 3:32 am on April 6, 2009 when the earthquake stopped time.Madonna, Carla Bruni & Obama Abandoned Pledges To Rebuild L'Aquila After The Quake|Barbie Latza Nadeau|November 18, 2014|DAILY BEAST
John Thavis, author of The Vatican Diaries called the document an earthquake.
If it leads to real change, not just in tone, but also in doctrine and policy, it would indeed be an earthquake.Pope Francis Pushes the Church Another Step Further on Gays|Gene Robinson|October 16, 2014|DAILY BEAST
No man is brave in presence of an earthquake, or a bursting boiler, or an exploding torpedo.A Journey to the Centre of the Earth|Jules Verne
And even when Brougham shook the walls like an earthquake, they understood why they held so fast to their seats.Sketches of Reforms and Reformers, of Great Britain and Ireland|Henry B. Stanton
Owing to the fall of the tower and the action of an earthquake in 1248, much rebuilding was found necessary.The Cathedrals of Great Britain|P. H. Ditchfield
This will be the earthquake felt in Agra on afar 3rd 911 AH.The Bbur-nma in English|Babur, Emperor of Hindustan
Passing this they came to a point where the solid glacier had been opened by the earthquake.The Call of the Beaver Patrol|V. T. Sherman
British Dictionary definitions for earthquake
Science definitions for earthquake
A Closer Look
Fractures in Earth's crust, or lithosphere, where sections of rock have slipped past each other are called faults. Earthquakes are caused by the sudden release of accumulated strain along these faults, releasing energy in the form of low-frequency sound waves called seismic waves. Although thousands of earthquakes occur each year, most are too weak to be detected except by seismographs, instruments that detect and record vibrations and movements in the Earth. The point where the earthquake originates is the seismic focus, and directly above it on Earth's surface is the earthquake's epicenter. Three kinds of waves accompany earthquakes. Primary (P) waves have a push-pull type of vibration. Secondary (S) waves have a side-to-side type of vibration. Both P and S waves travel deep into Earth, reflecting off the surfaces of its various layers. S waves cannot travel through the liquid outer core. Surface (L) waves-named after the nineteenth-century British mathematician A.E.H. Love-travel along Earth's surface, causing most of the damage of an earthquake. The total amount of energy released by an earthquake is measured on the Richter scale. Each increase by 1 corresponds to a tenfold increase in strength. Earthquakes above 7 on the Richter scale are considered severe. The famous earthquake that flattened San Francisco in 1906 had a magnitude of 7.8.
Culture definitions for earthquake
A tremor of the surface of the Earth, sometimes severe and devastating, which results from shock waves generated by the movement of rock masses deep within the Earth, particularly near boundaries of tectonic plates. (See fault, Richter scale, and seismology.)