From Chapter 58 of Roughing It:

A month afterward I enjoyed my first earthquake. It was one which was long called the “great” earthquake, and is doubtless so distinguished till this day. It was just after noon, on a bright October day. I was coming down Third street. The only objects in motion anywhere in sight in that thickly built and populous quarter, were a man in a buggy behind me, and a street car wending slowly up the cross street. Otherwise, all was solitude and a Sabbath stillness. As I turned the corner, around a frame house, there was a great rattle and jar, and it occurred to me that here was an item!—no doubt a fight in that house. Before I could turn and seek the door, there came a really terrific shock; the ground seemed to roll under me in waves, interrupted by a violent joggling up and down, and there was a heavy grinding noise as of brick houses rubbing together. I fell up against the frame house and hurt my elbow. I knew what it was, now, and from mere reportorial instinct, nothing else, took out my watch and noted the time of day; at that moment a third and still severer shock came, and as I reeled about on the pavement trying to keep my footing, I saw a sight! The entire front of a tall four-story brick building in Third street sprung outward like a door and fell sprawling across the street, raising a dust like a great volume of smoke! And here came the buggy—overboard went the man, and in less time than I can tell it the vehicle was distributed in small fragments along three hundred yards of street.

One could have fancied that somebody had fired a charge of chair-rounds and rags down the thoroughfare. The street car had stopped, the horses were rearing and plunging, the passengers were pouring out at both ends, and one fat man had crashed half way through a glass window on one side of the car, got wedged fast and was squirming and screaming like an impaled madman. Every door, of every house, as far as the eye could reach, was vomiting a stream of human beings; and almost before one could execute a wink and begin another, there was a massed multitude of people stretching in endless procession down every street my position commanded. Never was solemn solitude turned into teeming life quicker.

Of the wonders wrought by “the great earthquake,” these were all that came under my eye; but the tricks it did, elsewhere, and far and wide over the town, made toothsome gossip for nine days.
The destruction of property was trifling—the injury to it was wide- spread and somewhat serious.

The “curiosities” of the earthquake were simply endless. Gentlemen and ladies who were sick, or were taking a siesta, or had dissipated till a late hour and were making up lost sleep, thronged into the public streets in all sorts of queer apparel, and some without any at all. One woman who had been washing a naked child, ran down the street holding it by the ankles as if it were a dressed turkey. Prominent citizens who were supposed to keep the Sabbath strictly, rushed out of saloons in their shirt-sleeves, with billiard cues in their hands. Dozens of men with necks swathed in napkins, rushed from barber-shops, lathered to the eyes or with one cheek clean shaved and the other still bearing a hairy stubble. Horses broke from stables, and a frightened dog rushed up a short attic ladder and out on to a roof, and when his scare was over had not the nerve to go down again the same way he had gone up.
A prominent editor flew down stairs, in the principal hotel, with nothing on but one brief undergarment—met a chambermaid, and exclaimed:
“Oh, what shall I do! Where shall I go!”
She responded with naive serenity:
“If you have no choice, you might try a clothing-store!”

A certain foreign consul’s lady was the acknowledged leader of fashion, and every time she appeared in anything new or extraordinary, the ladies in the vicinity made a raid on their husbands’ purses and arrayed themselves similarly. One man who had suffered considerably and growled accordingly, was standing at the window when the shocks came, and the next instant the consul’s wife, just out of the bath, fled by with no other apology for clothing than—a bath-towel! The sufferer rose superior to the terrors of the earthquake, and said to his wife:
“Now that is something like! Get out your towel my dear!”

The plastering that fell from ceilings in San Francisco that day, would have covered several acres of ground. For some days afterward, groups of eyeing and pointing men stood about many a building, looking at long zig- zag cracks that extended from the eaves to the ground. Four feet of the tops of three chimneys on one house were broken square off and turned around in such a way as to completely stop the draft.
A crack a hundred feet long gaped open six inches wide in the middle of one street and then shut together again with such force, as to ridge up the meeting earth like a slender grave. A lady sitting in her rocking and quaking parlor, saw the wall part at the ceiling, open and shut twice, like a mouth, and then drop the end of a brick on the floor like a tooth. She was a woman easily disgusted with foolishness, and she arose and went out of there. One lady who was coming down stairs was astonished to see a bronze Hercules lean forward on its pedestal as if to strike her with its club. They both reached the bottom of the flight at the same time,—the woman insensible from the fright. Her child, born some little time afterward, was club-footed. However—on second thought,—if the reader sees any coincidence in this, he must do it at his own risk.
The first shock brought down two or three huge organ-pipes in one of the churches. The minister, with uplifted hands, was just closing the services. He glanced up, hesitated, and said:
“However, we will omit the benediction!”—and the next instant there was a vacancy in the atmosphere where he had stood.
After the first shock, an Oakland minister said:
“Keep your seats! There is no better place to die than this”—
And added, after the third:
“But outside is good enough!” He then skipped out at the back door.

Such another destruction of mantel ornaments and toilet bottles as the earthquake created, San Francisco never saw before. There was hardly a girl or a matron in the city but suffered losses of this kind. Suspended pictures were thrown down, but oftener still, by a curious freak of the earthquake’s humor, they were whirled completely around with their faces to the wall! There was great difference of opinion, at first, as to the course or direction the earthquake traveled, but water that splashed out of various tanks and buckets settled that. Thousands of people were made so sea-sick by the rolling and pitching of floors and streets that they were weak and bed-ridden for hours, and some few for even days afterward.—Hardly an individual escaped nausea entirely.
The queer earthquake—episodes that formed the staple of San Francisco gossip for the next week would fill a much larger book than this, and so I will diverge from the subject.

398.21–24 A month afterward I enjoyed my first earthquake . . . on a bright October day] Clemens freely reordered the chronology of the events of 1864 and 1865 in chapters 58 through 61 of Roughing It. The severe earthquake of 8 October 1865 occurred not one month, but fifteen months after Marshall and his companions sailed for New York, and more than seven months after Clemens’s return to San Francisco from the mining camps of Tuolumne and Calaveras counties (see chapters 60 and 61). Clemens published four sketches about the quake that have survived wholly or in part, and possibly others no longer extant. His Roughing It account draws on details recorded in three of the surviving sketches—“The Cruel Earthquake,” “Popper Defieth Ye Earthquake,” and “The Great Earthquake in San Francisco”—and, no doubt, upon his recollection of the anecdotes and “toothsome gossip” that circulated in the city for days following the quake (SLC 1865s–u, 1865aa).

"Chapter 58: note for 398.21–24," in Roughing It : an electronic text. 2016