Questions tagged [earthquake]

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How does a longer wavelength penetrate deeper with Rayleigh waves?

I'm struggling slightly to understand this idea. I've slowly been building up an explanation, so at this stage it might be just some confirmation I'm looking for, but also some guidance if I'm off ...
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18 views

How do earthquakes of different strengths affect buildings of different heights?

Why is it that short buildings respond more to high frequency oscillations while tall buildings respond more to low frequency oscillations? I would assume that how they react is related to the natural ...
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What is an earthquake like in terms of kinematics?

I would like to know how the Richter value of an earthquake converts into frequency and amplitude. Are there sub-frequencies? Is the vibration along one or multiple axes?
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What is the best length ratio between 'tongue' element of the brick and brick wideness shown on this picture?

What is the best length ratio of 'tongue' element of the brick to brick wideness shown on the picture to resist an ertquake stres? Should the ratio be less than 1:2 as the tongue should feel higher ...
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2answers
34 views

Understanding Snells Law in seismic waves

This is a homework question, Ill say it upfront. The Problem is given so: Earthquake causes a wave that meets a boundary between two rock substances. Incoming wave speed is 25 m/s and angle is 9 ...
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About EarthQuake?

As you know in Nepal many aftershocks are coming and earthquake is related to physics as earthquake is also a longitudinal waves . I have some series of question as well as my thoughts about it? Here ...
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2answers
38 views

Is the brick-concrete connection the 'weakest link' in brick made buildings?

When an earthquake strikes,do buildings made of bricks and concrete break mostly on concrete-brick connection spots?If Yes does the brick on the picture prevents this from occuring?
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Would the Earth have cracked differently than 'pole to pole' at Atlantic ridge if had been rotating slower?

When a thick hot peace of glass is left to cool down it will break on the surface. Have the same happened to Earth and did the fast rotation provoked the crack at the middle Atlantic to gain this pole ...
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3answers
117 views

Finding a single component of a strain tensor ($E_{yy}$) knowing $E_{xx}$ and $E_{yx}$

I know $E_{xx}$, $E_{yx}$, and $E_{xy}$ but I can't figure out how to find the value for $E_{yy}$. I think it has something to do with the phrase 'homogenous $2D$ strain' as a big hint since there's ...
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1answer
50 views

How could a structure be earthquake-proof?

I was just doing some research about earthquake-proof buildings and I couldn't figure out how some buildings achieve that. All what I found was very brief and I just wish there could be an article or ...
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How does one explain this pattern generated by earthquake waving driving a pendulum?

How to explain this pattern generated by earthquake wave driving a pendulum? Specially, there are three groups of curves that look categorically different: 1) The group of curves outside the olive-...
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Energy consumption [closed]

If the yearly worldwide energy consumption is 80,000 TWh, and a particular earthquake generates 1.6x10^13 Joules of energy. If we could harness all of the energy from the earthquake, for how long ...
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Plate tectonics and water

In a couple of places already i've read the following assertion: It is believed that plate tectonics might play an important part in maintaining the presence of water on a planet's surface one ...
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1answer
160 views

What is the magnitude of a super-nova on the Richter scale?

What is the richter scale of a super-nova? If one could measure compare it to standard earthquakes measured in logarithmic richter scale, what would be the value for a super-nova?
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47 views

Better to stay in the open or in the water during an earthquake?

I tried looking around on google but couldn't really find any good information. For arguments sake, say I am in a field with a river intersecting it. If an earthquake occurs and I am near the ...
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56 views

What is below a tectonic plate?

I know that tectonic plates float on mantle but when two plates move away from each other, is the mantle below them exposed to the surface?
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1answer
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How to convert Richter magnitude scale to approximate TNT?

I know the Richter magnitude scale is often used for measuring the strength of earthquakes. At the same time, explosive/destructive releases of energy are often quoted in equivalent amounts of TNT. Is ...
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45 views

Does mankind possess the technology to intentionally trigger a Yellowstone eruption? [closed]

The Yellowstone Caldera eruption will probably be an Extinction Level Event when it eventually happens. Suppose some lunatic wanted to set it off now, with drills, bombs, or whatnot. Say this lunatic ...
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2answers
178 views

Distinguishing an underground Hydrogen bomb test from a fission bomb explosion

A related question is Hydrogen bomb radiation output, but my question is based on the seismograph data (or any other data) possibly producing a distinctive pattern. Is it possible to tell the ...
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32 views

Is it possible to obtain the richter grade of an earthquake with the data of an accelerometer?

I have an accelerometer on a table that gives me the $x$, $y$, and $z$ axis acceleration in $m/s^2$ when I move the table. Is there a formula or method to pass this data to a earthquake grade in a ...
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1answer
663 views

Question about the difference between a tsunami caused by a meteorite and one caused by an under water earthquake

Picture the situation where a meteorite falls somewhere on one of our oceans and gives off all its kinetic energy to the water (let's ignore the thermal energies involved like, for example, the heat ...
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1answer
1k views

Accelerometer offset

First off, if this isn't the proper stack for this, I apologize, but since my question isn't based around code, I think this is the proper place. I am making a system based around a 3 DOF ...
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The LIGO Gravitational Wave Detection: have deep-mantle earthquakes been ruled out? [duplicate]

Everywhere I've looked so far that talks about the possibility the LIGO detection was an earthquake, involves being ruled out due to the large distance between the two LIGO sites. Two identical ...
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158 views

Distortion of interference pattern at LIGO

Does the vibration due to the earthquakes distort the interference pattern of LIGO's interferometer?
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389 views

Could LIGO discovery be due to e.g. earthquakes or have a terrestrial source? [duplicate]

I mean, could it have been earthquakes or anything else?
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2answers
115 views

Frequency of earthquakes

Are earthquakes getting less frequent across the centuries? I know that more seismic stations have register more earthquakes in the last century, but that doesn't imply there were more. I am ...
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143 views

Why don't p-type seismic waves propagate along straight lines in the lower mantle?

Can you tell me why seismic waves (p-type shock wave) passing through the earth's lower mantle don't propagate along straight lines in particular?
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1answer
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Upper limit on the earthquake magnitude

From the Gutenberg-Richter law we know that the frequency of an earthquake is a power law, so virtually any magnitude is possible on earthquake event. But the earth has a finite size so there must be ...
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2answers
107 views

It's All About Earthquake! [closed]

All the following informations i've got are from a book.(i want to check that whether the informations are correct or not,that book isnt a science book though) There is a limit to which earth can ...
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1answer
326 views

What happens if the Russians decide to nuke the Kola borehole?

I recently came across research on the Kola Superdeep Borehole in Russia. It's one of the world's deepest at 12 km (7.5 mi) down. If someone decided to hoist a nuclear weapon all the way down and set ...
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0answers
138 views

Richter scale equation

According to Wikipedia, the equation for finding magnitude according to the Richter scale is $M_\mathrm{L} = \log_{10} A - \log_{10} A_0(\delta)$. However, it is rather ambiguous as to the effect of ...
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128 views

Energy conversions, on terrestrial scale, before and during a massive Earthquake

Ethan Siegel is an astrophysicist who is now making a living as science blogger. There is a post titled: Where does an Earthquake's energy come from? Ethan Siegel points out that massive earthquake ...
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1answer
81 views

Potential collapse during an earthquake? [closed]

I was asked to determine the shear forces on 12" diameter table legs supporting a few hundred pounds of static weight. How does one calculate or determine the potential force on the legs and/or ...
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2answers
300 views

What made the 2011 Tohoku-Oki earthquake?

The Ocean Drilling Program recently published results indicating that the 2011 Tohoku-Oki earthquake produced a maximum co-seismic slip of more than 50 meters near the Japan Trench. This is the ...
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242 views

Jerk Magnitudes and Earthquakes

Destruction from earthquakes depends on many factors, including magnitude, occurrence depth and closeness to epicenter. One measure that may relate destructive force for buildings and infrastructure ...