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Heavy rain can trigger earthquakes
13:44 25 February 2008 by Catherine Brahic
"Huge downpours of rain can trigger earthquakes in landscapes riddled with caves and channels by increasing pressure within underlying rock, suggests a new study.
It was already known that rainfall could cause tremors, but the amount of water needed is much more than previously thought, says Steve Miller, a geologist at the University of Bonn, Germany.
In recent years, geologists have documented small earthquakes that occurred after heavy rainfall in Germany, Switzerland and France. All were low in magnitude - meaning they could be detected by seismographs, but not felt by humans.Some experts have suggested that although the rainfall was heavy, the fact that rain could trigger an earthquake at all suggests that it takes extremely little to produce a tremor. They concluded that the Earth's crust in a delicate balance, teetering on the edge of a slight shake-up at any moment.
Now, in the new study, Miller disagrees, pointing out that all the three documented events happened in a specific type of landscape known as karst. Other geologists studying rain-triggered earthquakes did note that they occurred in karst geology, but they did not delve into the possible implications.Karst landscape features a distinctive topography of soft carbonate rock riddled with deep fissures, underground channels and cave systems.
These characteristic features are carved out when carbonate bedrock - typically limestone or dolomite - is dissolved slowly by the action of slightly acidic rainwater over thousands of years. And these structures, says Miller, are key.
Journal reference: Geophysical Journal International (DOI: 10.1111/j.1365-246X.2008.03735.x)
The Great Floods of St Louis
"THE MISSISSIPPI RIVER AND ITS TRIBUTARIES.
part of the natural order of events that these great
rivers should discharge successively. But when, under
circumstances over which there exists no control, the
ordinary order of successive discharge is changed for
a simultaneous pouring out of all the tributaries, then
comes the "year of great waters," like 1785, 1811,
1823, 1826, 1844, 1858, and 1881. "
"There were high waters so as to overflow the low
grounds and fill the lakes and sloughs on the Ameri-
can Bottom at other seasons subsequent to 1785, but
none that deserve attention until that of 1811. It
was in the summer preceding the " shakes," as the
earthquakes were called. "
"The flood of 1811 was much greater than any that
followed until 1823,"
You can read the rest at :
Linked research story
]"The most recent major cooling in Europe early in the 19th century, during the three weakest, prolonged (12 or 13 long) cycles of solar activity (1798-1883). This cooling occured during the weakest, 13-year cycle of sunspots, from 1811 till 1823, during the absolute centennial minimum since 1700.
With regard to the Solar System, 1811 was a unique year, as at that time the Sun's distance from the centre of the Systems mass was the smallest (0.14 of the Sun's radius), and the Sun's acceleration was the highest (Boryczka, 1998)"
Link to .pdf original file
The Great Comet of 1811, formally designated C/1811 F1, is a comet that was visible to the naked eye for around 260 days, a record it held until the appearance of Comet Hale-Bopp in 1997. In October 1811, at its brightest, it displayed an apparent magnitude of 0, with an easily visible coma.
The comet was discovered March 25, 1811 by Honoré Flaugergues at 2.7 AU from the sun in the now-defunct constellation of Argo Navis. After being obscured for several days by moonlight, it was also found by Jean-Louis Pons on April 11, while Franz Xaver, Baron Von Zach was able to confirm Flaugergues' discovery the same night.
The first provisional orbit was computed in June by Johann Karl Burckhardt. Based on these calculations, Heinrich Wilhelm Matthäus Olbers made a prediction that the comet would go on to become extremely bright later that year.
Link to comet info
Originally posted by waybehind
The Mississippi River flooded earlier this year but the Missouri River is the one that's flooding now, not the Mississippi.
Originally posted by mb2591
hey this is going to be deleted if you don't use the ex-tex button its right above the text box.
Originally posted by awcgs
reply to post by sdebunker
Fascinating.....sounds like you did a lot of research.. star and flag for you sir. I have checked myself and you may have something. There are a few things that don`t add up, but overall makes for a very good reading. I live in the midwest and i keep up on this stuff. very interesting read thanks.
Originally posted by Chadwickus
reply to post by sdebunker
So why no big quake in 1823?
Originally posted by Chadwickus
reply to post by LDragonFire
There was flooding in 1823, his sources said it was bigger than 1811.
There was a comet in 1823 too....
In 1812, Mount Tambora became highly active, with its eruptive peak in the catastrophic explosive event of April 1815.
The Wobbling Sun
Were other factors at work, adding to the reduced solar flux and to the terrible ill effects from Tambora? The Sun's position in space moves about the solar system's center of mass (barycenter) in cycles that repeat themselves every 178 to 180 years. This wobbling motion is caused by the gravitational tug of the planets (mainly Jupiter and Saturn) and is similar to the stellar motions that Geoff Marcy, Paul Butler, Michel Mayor, Didier Queloz, Bob Noyes, Pete Nisenson, and other astronomers observe to detect extrasolar planets.Important years pertinent to this article for “inertial solar motion” — the barycenter shift — are 1632, 1811, and 1990.
What's the connection, then, between inertial solar motion and a cold 1816, the eruption of Tambora aside? Inertial motion theory supporters state that perhaps it is no accident that the timing of the first two years (1632 and 1811) corresponds to the two weakest sunspot activity periods ever recorded: 1645-1715 (Maunder Minimum) and 1795-1823 (Dalton Minimum). This correlation suggests that the 1816 events can be linked to the Sun's motion around the barycenter. But just how they are linked — if at all — is another matter altogether.
In addition, some studies suggest direct connections (without the Sun's radiation intervening) between the Sun's inertial motion dynamics and phenomena on Earth such as earthquakes, volcanic eruptions, massive rainfall, surface air temperatures, and so on. It must be emphasized that from a “hard science” perspective, nobody has identified any plausible physical mechanisms to support this unproved but intriguing hypothesis. We must ask more insightful questions in order to offer explanations for the many phenomena exhibited by the Sun's magnetic field. One solar inertial motion model predicts that a prolonged solar magnetic activity minimum will occur somewhere between 1990 and 2013. This prolonged minimum is expected to end around 2091.
Mount Rainier is a massive stratovolcano located 54 miles (87 km) southeast of Seattle, United States. It is the most prominent mountain in the contiguous United States and the Cascade Volcanic Arc, with a summit elevation of 14,411 feet (4,392 m). Mt. Rainier is considered one of the most dangerous volcanoes in the world, and it is on the Decade Volcano list. Because of its large amount of glacial ice, Mt. Rainier could potentially produce massive lahars that would threaten the whole Puyallup River valley.
Originally posted by sdebunker
I dont have those answers. But the good thing about doing research and being open minded is, it gives you the chance to educate yourself, you always have a new question to ask, and the more questions you search, and more opinions you are willing to hear from others, the more solid you can factually make your theory.
But, I dont have all the answers, but I can say, I wont stop looking