Complete Story of the San Francisco Horror

by Richard Linthicum; Samuel Fallows; Trumbull White

For a few years after this terrible eruption Ætna was quiescent, but in 1682 a new mouth opened on the east side of the mountain, and lava issued from it and rushed down the precipices of the Val del Bue. Early in January, 1693, clouds of black smoke poured from the great crater, and loud noises resembling the discharge of artillery, were heard. A violent earthquake followed, and Catania was shaken to the ground, burying 18,000 of its inhabitants. It is said that in all fifty cities and towns were destroyed in Sicily, together with approximately 100,000 inhabitants.

The following year witnessed another eruption, but no serious disaster resulted. In March, 1702, three mouths opened in the Contrada del Trifaglietto, near the head of the Val del Bue. In 1723, 1732, 1735, 1744, and 1747, slight eruptions occurred. Early in the year 1775 Ætna began to show signs of disturbance; a great column of black smoke issued from the crater, from which forked lightning was frequently emitted. Loud detonations were heard and two streams of lava issued from the crater. A new mouth opened near Rocca di Musarra in the Val del Bue, four miles from the summit, and a quantity of lava was ejected from it. An extraordinary flood of water descended from Val del Bue, carrying all before it, and strewing its path with large blocks. Recupero estimated the volume of water at 16,000,000 cubic feet, probably a greater amount than could be furnished by the sudden melting of all the winter’s snow on the mountain. It formed a channel two miles broad, and in some places thirty-four feet deep, and it flowed at the rate of a mile in a minute and a half during the first twelve miles of its course. The flood was probably produced by the melting not only of the winter’s snow, but also of older layers of ice, which were suddenly liquified by the permeation of hot steam and lava, and which had been previously preserved from melting by a deposit of sand and ashes, as in the case of the ancient glacier found near the summit of the mountain in 1828.

In November, 1758, a smart shock of earthquake caused the cone of the great crater to fall in, but no eruption followed. In 1759, 1763, 1766, and 1780, eruptions were noted, and on May 18, 1780, a fissure opened on the southwest side of the mountain and extended from the base of the great crater for seven miles, terminating in a new mouth from which a stream of lava emanated. This encountered the cone of Palmintelli in its course, and separated into two branches, each of which was about 4,000 feet wide. Other mouths opened later in the year, and emitted larger quantities of lava, while in 1781 and 1787 there were slight eruptions. Five years later a fresh outbreak occurred; earthquakes were prevalent, and vast volumes of smoke were carried out to sea, seeming to form a gigantic bridge between Sicily and Africa. A torrent of lava flowed toward Aderno, and a second flowed into the Val del Bue as far as Zuccolaro. A pit called La Cisterna, forty feet in diameter, opened in the Piano del Lago near the great cone, and ejected smoke and masses of old lava saturated with water. Several mouths opened below the crater, and the country round about Zaffarana was desolated.

In 1797, 1798, 1799, 1800, 1802, 1805, and 1808 slight eruptions occurred. In March, 1809, no less than twenty-one mouths of fire opened between the summit of the mountain and Castiglione, and two years afterward more than thirty mouths opened in a line running eastward from the summit for five miles. They ejected jets of fire, accompanied by much smoke. In 1819 five new mouths of fire opened near the scene of the eruption of 1811; three of these united into one large crater, and poured forth a quantity of lava into the Val del Bue. The lava flowed until it reached a nearly perpendicular precipice at the head of the valley of Calanna, over which it fell in a cascade, and being hardened by its descent, it was forced against the sides of the tufaceous rock at the bottom, so as to produce an extraordinary amount of abrasion, accompanied by clouds of dust worn off by the friction. Mr. Scrope observed that the lava flowed at the rate of about three feet an hour nine months after its emission.

Eruptions occurred in 1831, 1832, 1838, and 1842. Near the end of the following year, fifteen mouths of fire opened near the crater of 1832, at a height of 7,000 feet above the sea. They began by discharging scoriae and sand, and afterward lava, which divided into three streams, the two outer of which soon came to a standstill, while the central stream continued to flow at the rapid rate of 180 feet a minute, the descent being an angle of 25°. The heat at a distance of 120 feet from the current was 90° F. A new crater opened just above Bronte, and discharged lava which threatened the town, but it fortunately encountered Monte Vittoria, and was diverted into another course. While a number of the inhabitants of Bronte were watching the progress of the lava, the front of the stream was suddenly blown out as by an explosion of gunpowder. In an instant red-hot masses were hurled in every direction, and a cloud of vapor enveloped everything. Thirty-six persons were killed on the spot, and twenty survived but a few hours.

A very violent eruption, which lasted more than nine months, commenced on the 26th of August, 1852. It was first witnessed by a party of six English tourists, who were ascending the mountain from Nicolosi in order to witness the sun rise from the summit. As they approached the Casa Inglesi the crater commenced to give forth ashes and flames of fire. In a narrow defile they were met by a violent hurricane, which overthrew both the mules and the riders, and forced them toward the precipices of Val del Bue. They sheltered themselves beneath some masses of lava, when suddenly an earthquake shook the mountain, and the mules fled in terror. They returned on foot toward daylight to Nicolosi, fortunately without having sustained injury. In the course of the night many rifts opened in that part of Val del Bue called the Balzo di Trifaglietto, and a great fissure opened at the base of Giannicola Grande, and a crater was thrown up, from which for seventeen days showers of sand and scoriae were ejected.

During the next day a quantity of lava flowed down into the Val del Bue, branching off so that one stream flowed to the foot of Mount Finocchio, while the other flowed to Mount Calanna. The eruption continued with abated violence during the early months of 1853, and did not fully cease until May 27th. The entire mass of lava ejected is estimated to be equal to an area six miles long by two miles broad, with an average depth of about twelve feet.

In October, 1864, frequent shocks of earthquake were felt by the dwellers on Ætna. In January, 1865, clouds of smoke were emitted by the great crater, and roaring sounds were heard. On the night of the 30th a violent shock was felt on the northeast side of the mountain, and a mouth opened below Monte Frumento, from which lava was ejected. It flowed at the rate of about a mile a day, and ultimately divided into two streams. By March 10th the new mouths of fire had increased to seven in number, and they were all situated along a line stretching down from the summit. The three upper craters gave forth loud detonations three or four times a minute. Since 1865, there have been occasional eruptions, but none of great duration, nor has there been any loss of life in consequence.

It will be seen from the foregoing account that there is a great similarity in the general character of the eruptions of Ætna. Earthquakes presage the outburst; loud explosions are heard; rifts open in the sides of the mountain; smoke, sand, ashes, and scoriae are discharged; the action localizes itself in one or more craters; cinders are thrown out and accumulate around the crater in a conical form; ultimately lava rises through the new cone, frequently breaking down one side of it where there is least resistance, and flowing over the surrounding country. Out of the seventy-eight eruptions mentioned above, a comparatively small number have been of extreme violence, while many of them have been of a slight and harmless character.

Italy does not contain a more beautiful or fertile province than Calabria, the celebrated region which the ancients called Magna Grecia, where once flourished Crotona, Tarentum, Sybaris, and so many other prosperous cities. Situated between the volcanoes of Vesuvius and Ætna, Calabria has always been much exposed to the destructive influence of earthquakes, but the most terrible shock ever felt in the province was that of February 5, 1783. The ground was agitated in all directions, swelling like the waves of the ocean. Nothing could withstand such shocks, and not a building upon the surface remained erect. The beautiful city of Messina, the commercial metropolis of Sicily, was reduced to a heap of ruins.