And for those who dont care about a Seventh Day Adventist giving you historical information, here you go.
[FONT=Arial,Helvetica,sans-serif]Uriah Smith, Daniel and Revelation, “The Seven Seals”, p 443-474.[/FONT]
[FONT=Arial,Helvetica,sans-serif] "VERSE 12. And I beheld when he had opened the sixth seal, and, lo, there was a great earthquake; and the sun became black as sackcloth of hair, and the moon became as blood; 13. And the stars of heaven fell unto the earth, even as a fig tree casteth her untimely figs, when she is shaken of a mighty wind. 14. And the heaven departed as a scroll when it is rolled together; and every mountain and island were moved out of their places. 15. And the kings of the earth, and the great men, and the rich men, and the chief captains, and the mighty men, and every bond man, and every free man, hid themselves in the dens and in the rocks of the mountains; 16. And said to the mountains and rocks, Fall on us, and hide us from the face of him that sitteth on the throne, and from the wrath of the Lamb: 17. For the great day of his wrath is come; and who shall be able to stand?"
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[FONT=Arial,Helvetica,sans-serif] Such are the solemn and sublime scenes that transpire under the sixth seal. And a thought well calculated to awaken in every heart an intense interest in divine things, is the consideration that we are now living amid the momentous events of this seal, as will presently be proved.[/FONT]
[FONT=Arial,Helvetica,sans-serif] Between the fifth and sixth seals there seems to be a sudden and entire change in the language, from the highly figurative to the strictly literal. Whatever may be the cause of this change, the change itself cannot well be denied. By no principle of interpretation can the language of the preceding seals be made to be literal, nor can the language of this any more easily be made to be figurative. We must therefore accept the change, even though we should be unable to explain it. There is a great fact, however, to which we would here call attention. It was in the period covered by this seal, that the prophetic portions of God's word were to be unsealed, and many run to and fro, or "give their sedulous attention to the understanding of these things," and thereby knowledge on this part of god's word was to be greatly increased. And we suggest that it may be for this reason that the change in the language here occurs, and that the events of this seal, transpiring at a time when these things were to be fully understood, are couched in no figures, but are laid before us in plain and unmistakable language.
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[FONT=Arial,Helvetica,sans-serif] The Great Earthquake. - The first event under this seal, perhaps the one which marks its opening, is a great earthquake. As the most probable fulfilment of this prediction, we refer to the great earthquake of Nov. 1, 1755, known as the earthquake of Lisbon. Of this earthquake, Sears, in his Wonders of the World, pp. 50, 58, 381, says:- "The great earthquake of Nov. 1, 1755, extended over a tract of at least 4,000,000 square miles. Its effects were even extended to the waters in many places, where the shocks were not perceptible. It pervaded the greater portion of Europe, Africa, and America; but its extreme violence was exercised on the southwestern part of the former. In Africa, this earthquake was felt almost as severely as it had been in Europe. A great part of Algiers was destroyed. Many houses were thrown down at Fez and Mequinez, and multitudes were buried beneath the ruins. Similar effects were realized at Morocco. Its effects were likewise left at Tangier, at Tetuan, at Funchal in the Island of Madeira. It is probable that all Africa was shaken. At the north, it extended to Norway and Sweden. Germany, Holland, France, Great Britain, and Ireland were all more or less agitated by the same great commotion of the elements. Lisbon (Portugal), previous to the earthquake in 1755, contained 150,000 inhabitants. Mr. Barretti says that 90,000 persons 'were lost on that fatal day.'"
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[FONT=Arial,Helvetica,sans-serif] On page 200 of the same work, we again read: "The terror of the people was beyond description. Nobody wept; it was beyond tears. They ran hither and thither, delirious with horror and astonishment, beating their faces and breasts, crying, 'Misericordia; the world's at an end!" Mothers forgot their children, and ran about loaded with crucifixed images. Unfortunately, many ran to the churches for protection; but in vain was the sacrament exposed; in vain did the poor creatures embrace the altars; images, priests, and people were buried in one common ruin."[/FONT]
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The Encyclopedia Americana states that this earthquake extended also to Greenland, and of its effects upon the city of Lisbon further says: "The city then contained about 150,000 inhabitants. The shock was instantly followed by the fall of every church and convent, almost all the large public buildings, and more than one fourth of the houses. In about two hours after the shock, fires broke out in different quarters, and raged with such violence for the space of nearly three days that the city was completely desolated. The earthquake happened on a holy day, when the churches and convents were full of people, very few of whom escaped."
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[FONT=Arial,Helvetica,sans-serif] Sir Charles Lyell gives the following graphic description of this remarkable phenomenon:-[/FONT]
[FONT=Arial,Helvetica,sans-serif] "In no part of the volcanic region of southern Europe has so tremendous an earthquake occurred in modern times as that which began on the 1st of November, 1755, at Lisbon. A sound of thunder was heard underground, and immediately afterward a violent shock threw down the greater part of that city. In the course of about six minutes, sixty thousand persons perished. The sea first retired, and laid the bar dry; it then rolled in, rising fifty feet above its ordinary level. The mountains of Arrabida, Estrella, Julio, Marvan, and Cintra, being some of the largest in Portugal, were impetuously shaken, as it were from their very foundations; and some of them opened at their summits, which were split and rent in a wonderful manner, huge masses of them being thrown down into the adjacent valleys. Flames are related to have issued from these mountains, which are supposed to have been electric; they are also said to have smoked; but vast clouds of dust may have given rise to this appearance.
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[FONT=Arial,Helvetica,sans-serif] "The most extraordinary circumstance which occurred at Lisbon during the catastrophe, was the subsidence of the new quay, built entirely of marble, at an immense expense. A great concourse of people had collected there for safety, as a spot where they might be beyond the reach of falling ruins; but suddenly the quay sunk down with all the people on it and not one of the dead bodies ever floated to the surface. A great number of boats and small vessels anchored near it, all full of people, were swallowed up as in a whirlpool. No fragments of these wrecks ever rose again to the surface, and the water in the place where the quay had stood is stated, in many accounts, to be unfathomable; but Whitehurst says he ascertained it to be one hundred fathoms.
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[FONT=Arial,Helvetica,sans-serif] "In this case we must either suppose that a certain tract sunk down into a subterranean hollow, which would cause a 'fault' in the strata to the depth of six hundred feet, or we may infer, as some have done, from the entire disappearance of the substances engulfed, that a chasm opened and closed again. Yet in adopting this latter hypothesis, we must suppose that the upper part of the chasm, to the depth of one hundred fathoms, remained open after the shock. According to the observations made at Lisbon in 1837 by Mr. Sharpe, the destroying effects of this earthquake were confined to the tertiary strata, and were most violent on the blue clay, on which the lower part of the city is constructed. Not a building, he says, on the secondary limestone or the basalt was injured.
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[FONT=Arial,Helvetica,sans-serif] "The great area over which this Lisbon earthquake extended is very remarkable. The movement was most violent in Spain, Portugal, and the north of Africa; but nearly the whole of Europe, and even the West Indies, felt the shock on the same day. A seaport called St. Ubes, about twenty miles south of Lisbon, was engulfed. At Algiers and Fez in Africa, the agitation of the earth was equally violent, and at the distance of eight leagues from Morocco, a village, with the inhabitants to the number of about eight or ten thousand persons, together with all their cattle, was swallowed up. Soon after, the earth closed again over them.[/FONT]
[FONT=Arial,Helvetica,sans-serif] "The shock was felt at sea, on the deck of a ship to the west of Lisbon, and produced very much the same sensation as on dry land. Off St. Lucas, the captain of the ship 'Nancy' felt his vessel shaken so violently that he thought she had struck the ground, but, on heaving the lead, found a great depth of water. Captain Clark, from Denia, in latitude 36° 24' N., between nine and ten in the morning, had his ship shaken and strained as if she had struck upon a rock. Another ship, forty leagues west of St. Vincent, experienced so violent a concussion that the men were thrown a foot and a half perpendicularly up from the deck. In Antigua and Barbados, as also in Norway, Sweden, Germany, Holland, Corsica, Switzerland, and Italy, tremors and slight oscillations of the ground were felt.
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[FONT=Arial,Helvetica,sans-serif] "The agitation of lakes, rivers, and springs in Great Britain was remarkable. At Loch Lomond, in Scotland, for example, the water, without the least apparent cause, rose against its banks, and then subsided below its usual level. The greatest perpendicular height of this swell was two feet four inches. It is said that the movement of this earthquake was undulatory, and that it traveled at the rate of twenty miles a minute. A great wave swept over the coast of Spain, and is said to have been sixty feet high at Cadiz. At Tangier, in Africa, it rose and fell eighteen times on the coast; at Funchal, in Madeira, it rose full fifteen feet perpendicular above high-water mark, although the tide, which ebbs and flows there seven feet, was then at half ebb. Besides entering the city and committing great havoc, it overflowed other seaports in the island. At Kinsale, in Ireland, a body of water rushed into the harbor, whirled round several vessels, and poured into the market-place.
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[FONT=Arial,Helvetica,sans-serif] "It was before stated that the sea first retired at Lisbon; and this retreat of the ocean from the shore at the commencement of an earthquake, and its subsequent return in a violent wave, is a common occurrence. In order to account for the phenomenon, Mitchell imagines a subsidence at the bottom of the sea from the giving way of the roof of some cavity, in consequence of a vacuum produced by the condensation of steam. Such condensation, he observes, might be the first effect of the introduction of a large body of water into fissures and cavities already filled with steam, before there had been sufficient time for the heat of the incandescent lava to turn so large a supply of water into steam, which, being soon accomplished, causes a greater explosion." - Library of Choice Literature, Vol. VII, pp. 162,163.
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[FONT=Arial,Helvetica,sans-serif] If the reader will look on his atlas at the countries above mentioned, he will see how large a portion of the earth's surface was agitated by this awful convulsion. Other earthquakes may have been as severe in particular localities, but no other one of which we have any record, combining so great an extent with such a degree of severity, has ever been felt on this earth. It certainly supplies all the conditions necessary to constitute it a fitting event to mark the opening of the seal.[/FONT]