28 votes
Accepted

Why aren't seismic stations installed very deep underground so as to pre-warn from earthquakes?

The simple answer is that you can't drill to 50 km depth. The deepest holes ever drilled were to a little more than 12 km, one is named the Kola Superdeep Borehole in Russia, which was a scientific ...
Gimelist's user avatar
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26 votes

Why aren't seismic stations installed very deep underground so as to pre-warn from earthquakes?

10 seconds is a worthwhile warning time. The Japanese use it to switch off compressors on gas lines (or open release valves on them), emergency break bullet trains, and in particular shut down nuclear ...
Wolfgang Bangerth's user avatar
26 votes
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If a very huge Earthquake occured anywhere on Earth could waves emerge to come together again on the opposite side?

It is called "antipodal focusing". See for example Antipodal focusing of seismic waves observed with the USArray. We present an analysis of the M-w = 5.3 earthquake that occurred in the Southeast ...
Keith McClary's user avatar
21 votes

Is there any correlation between Grand Solar Minimums (GSM) and earthquakes?

The main proxy that we have of past solar intensity comes from its proven correlation to the number of sunspots, which have been recorded since the invention of the telescope in the early 1600's. And ...
Camilo Rada's user avatar
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21 votes

If the Bennu asteroid were to hit within a 500 mile radius of Yellowstone National Park, will it trigger a super volcano at Yellowstone?

There is actually an hypothesis that large asteroid impacts can trigger volcanism at the antipodal point, where the seismic energy of the impact focuses. On Earth, it has been suggested that the ...
Jean-Marie Prival's user avatar
17 votes
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If the Bennu asteroid were to hit within a 500 mile radius of Yellowstone National Park, will it trigger a super volcano at Yellowstone?

Maybe but it will depend on the state of the magma chamber under the caldera. If the magma chamber is already under enough pressure and has a super-eruptive quantity of liquid melt in it then the ...
Ash's user avatar
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14 votes
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Why do human populations concentrate near fault lines, volcanoes, etc.?

You're asking Why do human populations concentrate near fault lines, volcanoes, etc.? But the real question is Do human populations concentrate near fault lines, volcanoes, etc.? And the ...
Gimelist's user avatar
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14 votes
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What are the distinguishing features of an "artificial seismic wave" (e.g. a large underground explosion)

Several things can indicate that a seismic event is an explosion and not an earthquake. Firstly, the depth of the source. The shallowest earthquakes tend to have a hypocentre that is at least a ...
bon's user avatar
  • 2,221
13 votes

Why do some earthquakes and volcanoes occur within plates?

Crustal plates are not homogeneous, uniformly continuous rock masses with uniform stresses. They are a mixture of rock types with variable stresses and stress concentrations. They are also ...
Fred's user avatar
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11 votes

Would the shaking of an earthquake be visible to somebody in a low-flying aircraft?

It depends largely on how deep, or shallow, the earthquake is, how large, and what kind of terrain you're looking down on. Some fairly large earthquakes, magnitude 6-7, can have very little surface ...
Ash's user avatar
  • 4,260
9 votes
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Why did it take so long to discover the volcanic nature of mid-oceanic ridges?

If it weren't for WW2 and the search for German submarines, the discovery of mid-ocean ridges might have waited until satellite based gravimetric mapping in the 1980s. It was the use of fine ...
Knob Scratcher's user avatar
9 votes

If the Bennu asteroid were to hit within a 500 mile radius of Yellowstone National Park, will it trigger a super volcano at Yellowstone?

Bennu is about 470m diameter, and will impact at a "mere" 11.3km/s. At the impact site it would blast a crater some 3 miles wide and 1500 ft deep, a very respectable impact indeed. The ...
PcMan's user avatar
  • 191
8 votes

Why aren't seismic stations installed very deep underground so as to pre-warn from earthquakes?

I can see two major benefits of having a 10 second warning time: shutting down gas lines to prevent uncontrollable ruptures and fires after the tremor when comms channels are either destroyed or ...
Deer Hunter's user avatar
  • 2,093
8 votes

How to compare earthquake magnitudes

Taken straight-out from Prof. L. Braile's collection of earthquake hazard information, that explains it quite nicely: The magnitude scale is really comparing amplitudes of waves on a seismogram, ...
carnendil's user avatar
  • 377
8 votes

Earthquakes in Oklahoma influenced by Humans?

The sudden and recent occurrence of multiple earthquakes in Oklahoma is due to a widespread redistribution of stresses within the ground, particularly at depth. Installing large pipes underground for ...
Fred's user avatar
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8 votes

Are volcanoes formed from earthquakes?

From what you wrote, you are assuming several things: The mantle is made up of molten rock, Faults can go deep enough to reach the mantle. Both are not exactly accurate. lava starts flowing out ...
Gimelist's user avatar
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8 votes

Earthquakes at plate boundaries

The cause is partly geometry and partly process. Subduction zones generally take oceanic crust and upper mantle down into the deeper mantle, but the angle of the subduction zone varies greatly. For ...
Gordon Stanger's user avatar
8 votes
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What is that spooky humming sound heard in earthquake footages?

Wailing sirens. Examples 1, 2 where you see people come running out, i.e. exactly when you'd expect sirens, or 3, or 4 and 5 where they are explicitly mentioned.
Jan Doggen's user avatar
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8 votes
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2018 Swan Islands earthquake tsunami

This is the centroid moment tensor published by the USGS as of 01/10/18 (it will likely be updated in the future). As you can see this was an almost pure strike-slip mechanism on a near vertical plane....
bon's user avatar
  • 2,221
8 votes

Is it possible for tsunamis to occur on deep water planets?

Tsunami are caused by sudden changes in the sea floor. An earthquake that causes a slump or surge in the seabed can cause a tsunami. Tsunami travel as shallow water waves; they have a wavelength ...
James K's user avatar
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7 votes
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Is it possible to prevent high magnitude earthquakes by induced earthquakes?

The idea of trying to limit energy released by earthquakes and the damage that may result via the use of controlled smaller blast induced quakes is an interesting idea. One of the problems with this ...
Fred's user avatar
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7 votes
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Using accelerometer as a seismograph

The magnitude of an earthquake is related to the total energy released, therefore to estimate it from a seismogram you need to know the distance to the source. In the case of the Richter scale for ...
Camilo Rada's user avatar
  • 17.6k
7 votes

Megathrust earthquakes on subduction zones

Megathrust is not a particularly well defined term but in my experience it generally refers to very large earthquakes that occur on the subduction interface. The subduction interface is the main ...
bon's user avatar
  • 2,221
7 votes
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Did the Geothermal Power Plant contribute to Pahoa's Lava Fissures?

Original answer I think we can confidently enough answer "no". From the report "Eruptions of Hawaiian Volcanoes—Past, Present, and Future" (Tilling et al. 2010): Kilauea eruptions ...
Jean-Marie Prival's user avatar
7 votes
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What Magnitude does it Feel Like when Far Away in an Earthquake?

The question doesn't really make sense. The Richter and other seismic magnitude scales are measures of how much energy was released by an earthquake or how much work it did. An earthquake doesn't &...
Mark's user avatar
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7 votes
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Do planetary alignments affect Earth's seismic activity?

It's easy to make prediction of earthquakes in Turkey/Türkiye, it's in one of the most active seismic zones on the planet. The February 2023 earthquake had a magnitude of 7.8, with aftershocks of ...
Fred's user avatar
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6 votes
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How to interpret seismic interferometry data?

It is a differential InSAR image that shows wrapped phase in radians which is a measure of the change in range (or distance) between the ground surface and a (more or less) fixed point in space from ...
stali's user avatar
  • 2,381
6 votes
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Catalog of all significant earthquakes since 1900?

Okay so I got the data from https://earthquake.usgs.gov Since the website only allows to get 20k records at a time I made a little python script that downloads data for each month. ...
Kristjan's user avatar
  • 201
6 votes
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largest earthquake not in a subduction zone

08/15/1950 Assam, tibet, 8.9 magnitude. according to the USGS, https://earthquake.usgs.gov/earthquakes/browse/largest-world.php Note you are talking about a very small window of time there are only 5 ...
John's user avatar
  • 6,906
6 votes
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Could the 5.7 earthquake in Utah be a precursor to a larger one?

Short answer: Yes, but the odds are small. The USGS page that you linked to also links to a forecast: "According to our forecast, over the next 1 Week there is a 1 % chance of one or more aftershocks ...
jeffronicus's user avatar
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