What causes large interior earthquakes?
I know that many earthquakes (unless I am assuming wrongly) occur on tectonic plates mostly found near the oceans. However, there have been some large earthquakes inland as well. I give the examples of the 1994 Bolivian earthquake and the 2008 Sichuan earthquake.
Why do these large earthquake occur so far inland? Are there plates inland (I am assuming not)? If not why do these earthquake occur?
- 7 years agoFavorite Answer
An earthquake is the shaking of the ground caused by an abrupt shift of rock along a fracture in the Earth, called a fault. Within seconds, an earthquake releases stress that has slowly accumulated within the rock, sometimes over hundreds of years. ...
The size of an earthquake is indicated by a number called its magnitude. Magnitude is calculated from a measurement of either the amplitude or the duration of specific types of recorded seismic waves. Magnitude is determined from measurements made from seismograms and not on reports of shaking or interpretations of building damage. ... The intensity of and earthquake is a measure of the amount of ground shaking at a particular site, and it is determined from reports of human reaction to shaking, damage done to structures, and other effects. ...
Earth scientists believe that most earthquakes are caused by slow movements inside the Earth that push against the Earth's brittle, relatively thin outer layer, causing the rocks to break suddenly. This outer layer is fragmented into a number of pieces, called plates. Most earthquakes occur at the boundaries of these plates. In Washington State, the small Juan de Fuca plate off the coast of Washington, Oregon, and northern California is slowly moving eastward beneath a much larger plate that includes both the North American continent the land beneath part of the Atlantic Ocean. Plate motions in the Pacific Northwest result in shallow earthquakes widely distributed over Washington and deep earthquakes in the western parts of Washington and Oregon. The movement of the Juan de Fuca plate beneath the North America plate is in many respects similar to the movements of plates in South America, Mexico, Japan, and Alaska, where the world's largest earthquakes occur. ...
- mccumberLv 44 years ago
An Earthquake is a surprising tremor or flow of the earth's crust, which originates certainly at or under the exterior. The word organic is substantial right here, because of the fact it excludes ask your self waves brought about by skill of French nuclear exams, synthetic explosions and landslides brought about by skill of establishing artwork. There are 2 substantial reasons of earthquakes. at the start, they are able to be related to explosive volcanic eruptions; they are in actuality very simple in aspects of volcanic activity the place they the two proceed or accompany eruptions. Secondly, they are able to be triggered by skill of Tectonic activity linked with plate margins and faults. the vast majority of earthquakes international huge are of this style. Terminology An earthquake may well be likened to the end result reported while a stone is thrown into water. After the stone hits the water a collection of concentric waves will pass outwards from the midsection. a similar activities happen in an earthquake. there's a surprising flow interior the crust or mantle, and concentric ask your self waves pass out from that element. Geologists and Geographers call the beginning of the earthquake the concentration. because this is regularly deep under the exterior and puzzling to map, the area of the earthquake is regularly noted because of the fact the element on the earth floor today above the concentration. This element is termed the epicentre. The power, or magnitude, of the shockwaves determines the quantity of the wear and tear brought about. 2 substantial scales exist for outlining the ability, the Mercalli Scale and the Richter Scale. Earthquakes are 3 dimensional activities, the waves pass outwards from the concentration, yet can holiday in the two the horizontal and vertical plains. This produces 3 categories of waves that have their very own diverse traits and might in trouble-free terms struggle by particular layers interior the Earth. shall we take a seem at those 3 sorts of ask your self waves.
- Anonymous7 years ago