This is an astronomical phenomenon that occurs in different intensities about once a year, but this time it should provide us with a spectacular show.
Tonight and tomorrow we will be able to enjoy a particularly large and bright moon - a supermoon.
On Sunday at 14:00 noon Israel time (11:00 GMT) the moon will reach the closest point in its orbit around the Earth - Phrygia - a distance of 356,991 kilometers from the Earth.
As far as the astronomers are concerned, the term super moon, invented by astrologers, has no meaning. From an astronomical technical point of view, it is a phrygia-syzygous, which means a new moon or a full moon that occurs when the moon is in phrygia (the closest point in its orbit to the earth) or near it."
There is nothing new in this because the moon reaches the perigee once a month and in some cases twice, even if its distance changes by 3%. But this time it is a combination of the greatest approach and the full moon. A total of 32 minutes after reaching Phrygia it will officially be considered a full moon making it the largest full moon of the year. To observers with the naked eye it will appear full on these two nights, since the dark strip on the moon is particularly narrow.
The moon will be 12.2% larger tonight compared to the opposite situation where the full moon will be at the furthest point in its orbit on January 16, 2014.
In addition, the combination of a full moon (which means an almost straight line between the earth, the sun and the moon) and its relative proximity - there is a large variation between the high tides and low tides in the oceans, but not the high tides, which usually lag a few hours or even a few days after the phrygia (regardless of the appearance of the moon) ).
By the way, there is no connection between this phenomenon and the "The Moon Illusion", according to which the moon appears larger to us at sunrise or sunset, only because we can compare it to objects in the background. And also, even if at first glance it seems logical - there is no connection between the approach of the moon, in full or not in full and earthquakes and other natural phenomena.
17 תגובות
Miracles,
You are right and it only reinforces the point - the time scale required for heat to move through the earth is much longer than one day or thirty days.
Miracles:
I don't know what you call a restraining effect. I have explained exactly the effect and you can call it restraining or enhancing just as much. It increases the pace and curbs the intensity. This is what I explained. You didn't explain anything, so you can say you agree with me, but I think it's only because of the explanation I gave.
The effect has been measured and proven in so many studies that Wikipedia does not bother to cite other studies.
The studies you pointed to (with the exception of the last one which is really ancient - maybe even older than you) talk about the existence of an effect, albeit a small one.
The more the methods of measurement improved, the more the impact was diagnosed and as mentioned - Wikipedia does not even bother to state a different claim.
deer
The 30 day cycle has no effect. What can affect is the daily cycle. The kneading is caused by the change in the relative position between us and the moon. The 30 day cycle affects the distance to the moon but this is of secondary importance.
Michael
We both agree, then, that the tidal effect is a dampening effect on earthquakes. I am not convinced that this is a measurable effect - the acceleration forces of the moon on the earth are much less than a million g. The study you refer to also talks about earthquakes of a certain type, in an area of a certain type of coast - in this place, the rise of the sea level following a tide causes a high load on the ground. But to my understanding, Cochrane's article does not talk about the effect of kneading the soil.
Here are some articles…..
http://onlinelibrary.wiley.com/doi/10.1029/98JB00594/abstract
http://onlinelibrary.wiley.com/doi/10.1029/2001JB001518/abstract;jsessionid=3C63FA17B3238F528D799B57E0B72D59.d02t02
http://gji.oxfordjournals.org/content/28/1/27
http://www.bssaonline.org/content/72/6A/2181.abstract
By the way, miracles:
It turns out that even Wikipedia knows this:
http://en.wikipedia.org/wiki/Earthquakes#Tidal_forces
Miracles:
When I suggested that you read - I meant reading the comments you are responding to - not reading in general.
If you had really read my response - you wouldn't have asked if I had done research (but you did ask, so I concluded that you didn't).
You say you have read many more studies that say there is no connection.
I would love to see you point to one of these.
The question of whether the effect is "for the better" is meaningless without a scale of values.
What is good, in your opinion, about this?
We can discuss it, if you want (although it seems pointless to me because we have nothing to do about it), but for that you need to understand the impact and I don't think you did.
I summarize the effects for you so that you can start thinking about the question of good and bad:
The tidal forces cause the elastic energy stored in the plates to be released earlier than it would be without them.
This affects, therefore, the timing of the earthquakes but it should be remembered that if the energy is not released in an earthquake, it will be released sometime in the future, after additional energy has been accumulated and then the earthquake will be stronger.
Therefore, it is possible, in general, to say that the tides cause a higher frequency of vibrations that have a lower intensity.
Against the background of these facts, you can discuss whether it is good or bad, but I do not intend to participate in this discussion.
deer:
The matter of kneading is of course true and to imply it I mentioned the moon Io (I already saw that the direct connection to the earthquakes is difficult for people to understand, so I did not expand on this matter).
Tidal forces are important for earthquakes in two respects:
As Michael mentioned here, they cause a local minimum in the forces acting between the plates and facilitate the release of the energy.
But it's more than that - if we take the analogy of the dough, then what tidal forces do is constantly knead the dough, and since it takes a lot of energy to knead a dough made of rocks - the dough heats up and eventually the energy has to be released.
The point is that here we are talking about very long time scales before sufficient energy is collected. To collect enough energy for a sufficient earthquake requires a period much longer than the 30 days of the lunar cycle.
By the way, according to Wikipedia (http://en.wikipedia.org/wiki/Earth#Heat) about 80% of the heat in the core of KDA comes from radioactive decays, and since that is where most of the thermal energy is (and it is transferred out) I estimate that most of the geothermal energy originates from radioactive decays.
Yehuda, the forces of the tides and tides arise from the derivative of the gravitational force and not from the gravitational force itself because the mountains of the moon and the earth are in free fall and there is no gravitational force that the moon exerts on the earth
It is also possible to combine the opportunity with an organized trip to Europe, the moon of Jupiter which may reveal to you who Ganymede is.
Michael Rothschild
I did read and found many more studies that claim there is no connection between tides and earthquakes.
All in all, I'm saying that it's not necessarily true. I described the possibility that tides actually weaken the strength of earthquakes. That is, there will be more vibrations, but they will be weaker.
I agree with you that (maybe) tides have an effect on earthquakes. I just think it's a positive influence.
And as I mentioned in the response to which I referred - to all those who claim that there is no effect, it is recommended to visit the moon Io (the moon of Jupiter which may reveal to you who is right).
Maybe Assaf Rosenthal will volunteer to guide a trip there? 🙂
Miracles:
As mentioned - it is better to read before commenting.
Surely there is a physical connection.
Earthquakes are the breakdown of energy stored in the layers of the earth as a result of the movement of the continents, whose effect was inhibited until the moment of the earthquake by the friction between the layers.
The friction is characteristic of the normal force acting between the surfaces and when this force decreases under the influence of the tides, the energy stored in the layers can erupt as an earthquake.
Besides, just as there are ebbs and flows in other liquids - there are also ebbs and flows in the trend, and this can be reflected in volcanic phenomena.
You ask if I did research, but I already in my previous response adopted the slogan "Which one is smart?" The learner from the experience of others" and I quoted a study conducted by others on the subject.
By the way - they did not receive a Nobel Prize because the result was, as mentioned, expected.
Michael Rothschild
I'm interested in how you deduced that. Is there an empirical connection between the phenomena? Is it possible to find any periodicity in the earthquakes? I think a Nobel Prize awaits you if you find such a connection 🙂
I will make the opposite claim: the phenomenon of tides actually mitigates the impact of earthquakes. Imagine a ball of dough thirty in your hands compared to another ball of dough lying on the table. Massaging the ball of dough with your hands causes the forces to be dispersed within the dough and prevents the formation of cracks. The ball of dough on the table also dries out over time - but much larger cracks will form in it. This also happens on the planet: massage still prevents the formation of large forces and reduces the intensity of earthquakes.
According to you - my claim goes against the laws of physics. I would appreciate it if you could show me where I am wrong.
Father, miracles:
The existence of a connection between tidal forces and earthquakes and volcanic activity is a certain thing and it stems from the laws of physics.
The only question to ask is about the strength of this relationship.
There is a connection between smoking and cancer but that does not mean that everyone who smokes gets cancer or that all cancer patients are smokers.
In the same way - the existence of a connection between earthquakes and high tides does not require that every earthquake will occur during high tides or that every high tide will be accompanied by an earthquake.
https://www.hayadan.org.il/super-moon-or-super-hype-1403114/comment-page-2/#comment-287511
http://www.sciencedaily.com/releases/2004/10/041022103948.htm
This is me…
Sabdarmish Yehuda
You probably didn't read the article... The moon comes this close every month. By chance - it applies to the full moon. And precisely in this situation the effect of his gravity is actually smaller than usual in this situation.
If the distance of the moon had an effect on earthquakes then we should have discovered a monthly cycle in the earthquakes. Do you know such a cycle?
I wasn't so sure about drawing conclusions about earthquakes and volcanoes. After all, the force of gravity increases according to the square of the distance. In the situation mentioned in the article, the gravitational force exerted by the moon on the earth is more than 25% greater than in its opposite state. And if we also add to this the pull of the sun, it is difficult to say with full confidence that this tremendous pull does not have any effect on volcanoes or earthquakes.
But what do I understand?
good week
Sabdarmish Yehuda