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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
  • 2,211
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
  • 4,550
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

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
  • 2,211
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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8 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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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
  • 17.7k
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
  • 2,211
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
  • 1,261
6 votes
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What would happen if magma flows into a very large oil deposit?

If there were an earthquake that somehow cause a crack in the earth and allowed a significant amount of magma to flow into a very large oil deposit. My understanding from this is that you are making ...
Gimelist's user avatar
  • 23.2k
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
  • 6,966
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
  • 3,487
6 votes

How did they know that there was a "desert tsunami" in a Death Valley cave after a 7.6 magnitude earthquake near the southwest of Mexico?

The news section of the Death Valley National Park website has the story: Mexican earthquake sloshes Devils Hole. There is footage of the waves at the end of the page. Here is a screenshot from the ...
Jean-Marie Prival's user avatar
6 votes
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Are seismometers over the world "feeling" the small earthquakes caused by air raids and shelling on Gaza Strip?

Bomb explosions are detectable as seismic events, but the energy falls off with distance, so for quakes of less than magnitude 3 you'd have to be with a few 10s of kilometers, depending on your ...
jeffronicus's user avatar
  • 3,487
5 votes
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Prompt gravity signal induced by the 2011 Tohoku-Oki earthquake - could this really be useful for warnings?

If you have a sufficient number of sensors, e.g., land-based or ocean-bottom seismometers, in the vicinity of where strong earthquakes typically happen, then it will take a few seconds for seismic ...
Wolfgang Bangerth's user avatar
5 votes

Relationship between tides and earthquakes

I don't find Ide et al's recent paper to be very convincing. They only studied three earthquakes - hardly a statistically representative sample. There are millions of earthquakes on record, and ...
Gordon Stanger's user avatar
5 votes
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Has the Olema earthquake fence continued to spread apart?

If your question is only about the location of said fence I can not answer it. If, however, you are interested in the greater area around that location or the San Andreas fault in General, the short ...
ye-ti-800's user avatar
  • 413
5 votes

How to compare earthquake magnitudes

The base of the Richter scale is empirical. In terms of energy released, the best fit for the base turns out to be about 31. Since 31**2 is close to 1000, two points on the Richter scale e.g., from ...
Brian Hill's user avatar

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