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what causes aftershocks?


There are a number of different types of earthquakes, and they vary in intensity from very mild quakes that are barely felt to severe ones that cause large amounts of damage and can trigger tsunamis and volcanic eruptions. At around a centimetre per year, they are regular geological Ferraris.

In the case of the Aftershocks rates and magnitudes follow several well-established empirical laws.



In any earthquake cluster, the largest one is called the mainshock; anything before it is a foreshock, and anything after it is an aftershock.
"This might be of some comfort to residents near the epicenter of the The new results will help investigators in both understanding earthquakes in continents and trying to assess earthquake hazards there.



"The views expressed are those of the author(s) and are not necessarily those of Scientific American. Explore our digital archive back to 1845, including articles by more than 150 Nobel Prize winners.© 2020 Scientific American, a Division of Nature America, Inc.Support our award-winning coverage of advances in science & technology.Subscribers get more award-winning coverage of advances in science & technology.Many researchers assume that small-scale seismic activity reveals where stress is building up in the Earth’s crust — stress that can cause larger quakes in the future, says Mian Liu, a geophysicist at the University of Missouri in Columbia. If that’s what floats your boat. And what causes these strange shaking episodes? Aftershocks are caused by the same phenomena as the mainshock: slippage along pkate boundaries .







Notable aftershocks. "But we now know the big earthquakes can pop up somewhere else.

A confirmed adorer of the good science of rock-breaking, Dana Hunter explores geology with an emphasis on volcanic processes, geology news, and the intersection of science and society. Anything we can do to increase the chances of successful earthquake prediction could help save a lot of lives.





However, their magnitude and frequency decrease over time.

[The largest aftershock so far in Nepal was measured at magnitude 6.7.By analyzing thousands of quake records, Van der Elst has shown that location is as important as earthquake size in forecasting large aftershocks.





The iconic Anglican cathedral of Christchurch, N.Z., damaged by a powerful aftershock that struck the city on Feb. 22, 2011.

As time passes and the fault recovers, they become increasingly rare.

The fault rupture is the area of the fault that is torn apart during the earthquake.For the Nepal earthquake, the USGS forecast a 100 percent chance of magnitude-5 aftershocks this week, a 54 percent chance of magnitude-6 temblors and a 7 percent chance of a magnitude-7 aftershock.Van der Elst's analysis could boost the accuracy of aftershock forecasts by adding a location to the size estimates.



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When attempting to predict the decrease in Although aftershocks tend to be weaker events relative to the power of the main quake, some aftershocks have caused significant damage. The stress on the mainshock's fault changes drastically during the mainshock and that fault produces most of the aftershocks. This condition, known as "earthquake sickness" is thought to be related to This article is about the geological event. Aftershocks …

Aftershocks in human females last for approximately one minute after an intense orgasm.





Aftershocks decrease in magnitude and frequency over time.

For other uses of the term, see



They then looked at data from faults around the world and found the expected pattern. Once the rate at which these tremors occur has declined to pre-earthquake levels, the sequence of aftershocks ends. Aftershocks are a sequence of earthquakes that happen after a larger mainshock on a fault.

Categories  "We really want to know where to expect that magnitude 6 if it's in a major metropolitan area."

For example, aftershocks continue today from the magnitude 7.2 Hebgen Lake earthquake that shook Montana, Idaho and Wyoming 50 years ago.



The main quake doesn't tell us much about an aftershock. These aftershocks can persist for over a minute after the initial orgasm, although orgasms in women generally last only 20-30 seconds themselves. If not, then it is a complex question.



Most of it's concealed below the surface, and what's been exposed doesn't look much like a fault. What causes quake aftershocks?





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