Earthquakes in small areas

[Qawsedf234]

Really, most earthquake calcs here are rather exaggerated power wise

• A 1.1 Kiloton explosion in the middle east generated earthquakes heard 150 miles away and was measured as a 3.3 magnitude earthquake by a US geological survey team despite being thousands of miles away
• The Tsar Bomba generated enough energy seismic energy to be read across the planet and its seismic waves circled the planet three times and was measured as a Magnitude 5 to 5.25 earthquake
• The OG Atomic Bombs generated earthquakes that could be felt from Hawaii and California despite being detonated in Japan

Using the first one for example:

• The distance between the HQ of the USGS and Beirut is 9364 kilometers
• The formula would look like this: (3.3) + 6.399 + 1.66*log10((9364/110)((2π)/360)) = 9.98443050518 = 5.9792e+19 Joules
• The US survey actually created a map of the explosion with the Merc intensity scale and if we used our stuff for it you'd get similar rather highballed results

What we're basically doing is taking a calc for the kinetic energy of a meteor impact and applying it to anything that causes stuff to shake. Despite it requiring far, far less energy than you'd think to accomplish that.

 

[DMUA]

This exact thing is what I was thinking of, yes.

I find it disturbing DontTalk never bothered to explain why Earthquake calculations spontaneously became valid again.

 

[KLOL506]

This exact thing is what I was thinking of, yes.

I find it disturbing DontTalk never bothered to explain why Earthquake calculations spontaneously became valid again.

It was only made invalid for localized stuff, large scale quakes affecting countries or the entire world was fine in that CRT tho.

 

[DMUA]

I know, but in this case we are talking about (relatively) localized stuff

 

[DMUA]

The US survey actually created a map of the explosion with the Merc intensity scale

actually, looking at this, it seems to be saying it's a 3.3 at the epicenter, with it's effects rippling through those squares colored in the same sort of code as the scale at the bottom, but it does demonstrate the idea you definitely shouldn't do this for an area less than kilometers wide

The other examples also probably fall under that, yeah they could feel the impacts from that far away, but it's like most earthquakes in San Diego, you'd barely notice it if you weren't actively paying attention/live in the area

(Unless the accounts specify that stuff was shaking around but that raises a lot more questions)

 

[Qawsedf234]

actually, looking at this, it seems to be saying it's a 3.3 at the epicenter

The total quake was 3.3, but the force at the epicenter was rated as a Merc VII due to how violent the shaking was. If you were to plug that number (mag 6) into any formula you'd get numbers order of magnitude higher than the actual explosion.

Solid objects are just absurdly good at transferring energy and force.

 

[DMUA]

Or mostly just, magnitude isn't designed for someone measuring the exact tectonic plate that gives it off (heck, it's common for high magnitude earthquakes to end up barely doing anything because they start really far underground, I believe)

Either way localized earthquake wack

 

[KLOL506]

Or something something peak ground acceleration and KE. Maybe that could work and it'd nerf the results collectively (For localized areas at least), but not sure, you'd need the mass of the object you're shaking.

 

[KLOL506]

Necro Bump

Was this thread ever concluded?

 

[XSOULOFCINDERX]

Doesn't look like it.

 

[KLOL506]

@DontTalkDT @DMUA @CloverDragon03 @DemonGodMitchAubin @Executor_N0 @Dalesean027 @Therefir @AbaddonTheDisappointment @Dark-Carioca

So, what should we do here? Allow the usage of the Earthquake formula if it shakes everything close to 100 meters and above?

 

[DMUA]

Does this have to mark the like third time we say no

 

[KLOL506]

Does this have to mark the like third time we say no

Well, DT never elaborated upon it so I'd like to see what he has to say about it. At what mark the Earthquake formula is allowed to be usable.