MadMonk
-
Posts
306 -
Joined
-
Last visited
-
Days Won
1
Content Type
Profiles
Forums
Events
Blogs
Gallery
Posts posted by MadMonk
-
-
From what I understand, it's because the air quality is so bad. There is much much more air pollution there than there is in north America. What I wonder about is why they wear them here too. I often see them in Richmond or downtown. Maybe they are used to wearing them their whole lives? Maybe they feel the air quality here is bad as well ?
I've been to Tokyo several times and the pollution is not bad at all. I believe they wear masks whenever they are sick to prevent the spread of the germs.
-
That's why it is in 'quotes.'
Just because it comes from the direction of the Oort cloud might not mean it is necessarily rock and ice, does it? Tyche has made me question a lot.
Then a woman predicts an earthquake on the Internet including magnitude. If not her explanation then what? I am open to ideas because I don't know what to make Of that.
The fact that it is classified as a comet that entails it is a small piece of rock. Given the effort the astronomers put into classifying whether pluto is a planet or not, it is unlikely that the comet is not in fact a comet. It is even more unlikely that it is a brown dwarf since a brown dwarf has a mass that is at least 10 times the mass of the jupiter, and have the same size as jupiter.
In addition, I think the magnitude of the force is irrelevant since what matters to an earthquake is that the forces acting each side of the tectonic plate is different. At that distance the difference will be even more minute. That's the same reason why 'supermoon' cannot possibly be an explanation either. The change in the gravity is already minute, and the change in the difference between the two plates will be even more so.
To further put the numbers 400N to 40,000N into perspective, consider the amount of forces involved in a fault:
according to http://www.whoi.edu/science/GG/people/jlin/papers/Freed&Lin-Geology-2002.pdf
the pressure buildup over the San Andreas fault over a 10 year period is 2-3 bars, which is 200,000 Pa, that is 200,000 N per square meter of the fault. For a fault that is 100km wide and 10km deep, that's about 10^14 N.
-
Are you going with the 'lucky guess' theory then?
What if the 'comet' was made of something really, really dense? She mentioned something about brown dwarf but I was not sure why at the time.
By definition a comet is made out of rock and ice.
-
I admit that she might have a point somewhere, but it's not angels and demons, it's rather gravity. We know how such a small object like the moon can influence our lives (tide, biorythm, etc.), so why not say that there are certain changes in the gravity system of our planet when alignments take place? It could result in releasing friction at the edges of tectonic plates.
The force exerted on the earth by the comet is minuscule.
From what I gather, it is currently about 2AU, or about 3x10^11meters away from earth. I can't find the mass of of the specific comet, but I've seen numbers from 10^11 kg to 10^14 (halley's comet) from google.
Plugging into Newton's law of gravity F=G M1 M2/r^2, with G = 6 x 10^-11, mass of earth 6x10^24, the force of comet on earth=400N to 400,000N
For comparison an average male of 80kg exerts about 800N on the earth.
-
1
-
OMG Earthquake?
in Off-Topic General
Posted
For those who are wondering why there's a discrepancy between JMA and USGS reports
http://earthquake.usgs.gov/learn/faq/?faqID=22
Basically you are inferring the scale by measurements at locations that are not right at the epicentre, and the estimated magnitude will depend on what assumptions you make about how seismic waves propagate. JMA and USGS may very well have different models
In addition, there are always error bars associated with any estimations, so as long as the error bars overlap for the JMA and USGS estimation it is not really a discrepancy.