[Ill.u.s.tration: Copyright 1906, by American-Journal-Examiner. All rights reserved. Any infractions of this copyright will be prosecuted to the full extent of the law.
=CRACK IN THE EARTH.=
This photograph shows a crack in the earth in Golden Gate Park, San Francisco, caused by the earthquake.]
[Ill.u.s.tration: =GHOULISH THIEVES LOOTING THE DEAD.=
This harrowing scene shows the way the dead and injured are frequently robbed after a disaster.]
"The latter are the most dangerous to human life and the physical face of a country. Eruptions that build up mountains are periodical wellings over of molten lava, comparatively harmless. But in this building up, which may cover a period of centuries, natural volcanic vents are closed up and gases and blazing fires acc.u.mulate beneath that must eventually find the air. Sooner or later they must burst forth, and then the terrific disasters of the second cla.s.s take place. It is the same cause that makes a boiler burst."
Professor Milne was asked after Krakatoa"s performance:
"Is it likely that there are volcanoes in the world at present that have been quiet for a long time but will one day or another blow their heads off?"
"It is almost certain there are."
"Some in Europe?"
"Many in Europe."
"Some in the United States?"
"Undoubtedly."
Mount Pelee of Martinique has verified the eminent authority"s word.
Professor Angelo Heilprin, of Philadelphia, the eminent geologist and authority on volcanology, declares there is danger that all the West Indian reef islands will collapse and sink into the sea from the effects of the volcanic disturbances now in progress. More than that, he says, the Nicaraguan ca.n.a.l route is in danger because it is in the eruption zone.
"In my opinion the volcano eruptions are not the only things to be feared," he continued. "It is altogether likely that the volcanic disturbance now going on may result in the collapse of the islands whose peaks spring into activity. The constant eruptions of rock, lava, and ashes, you must know, mean that a hole, as it were, is being made in the bosom of the earth. When this hole reaches a great size, that which is above will be without support, and then subsidence must follow. The volcanoes of Martinique and St. Vincent, and of the neighboring islands of the Caribbean, are situated in a region of extreme weakness of the earth"s crust, which has its parallel in the Mediterranean basin on the opposite side of the Atlantic. This American region of weakness extends westward from the Lesser Antilles across the Gulf of Mexico into Mexico proper, where are located some of the loftiest volcanoes of the globe, Popocatepetl and Orizaba, both now in somnolent condition, and including the more westerly volcano of Colima, which has been almost continuously in eruption for ten years.
"This same region of weakness includes nearly the whole of Central America. Volcanoes in Costa Rica, Nicaragua, and Guatemala have been repeatedly active, some almost to the present time, many with destructive effect, and it should be no surprise to have some of them burst out with the same vigor and intensity as Mount Pelee or the Soufriere."
The National Geographic Society sent three geographers to make a special study of the eruptions in Martinique and St. Vincent: Professor Robert T. Hill of the United States Geological Survey; Professor Israel C. Russell of Ann Arbor, Mich., and C. E.
Borchgrevink, the noted Antarctic explorer.
Professor Hovey, after a careful examination of the desolated areas in Martinique and St. Vincent, related important scientific phases of the great eruptions. Speaking first of the work of his companions and himself in St. Vincent, he said:
"Collection of data concerning the eruption of La Soufriere was immediately begun. The history of the eruption is practically that of the disturbance of 1851. Earthquakes occurred here about a year ago, and have occurred at intervals at various places in the West Indies and adjacent regions ever since. At least one resident of Kingstown--F. W. Griffiths--several months ago predicted that La Soufriere would soon break out.
"Finally, on the day of the great eruption, a vast column of volcanic dust, cinders, blocks of lava and asphyxiating gases rose thousands of feet into the air, spreading in all directions. A large portion of this, having reached the upper current, was carried eastward. This, falling, was again divided, and the cinders and deadly gases were swept by the lower winds back upon the eastward side of the mountain.
The wrecked houses show this, the windows on the side toward the crater being unaffected, while those on the farther side were wrecked by the back draught up the mountain.
"There was no wind on the morning of the great outburst, a fact which facilitated the devastation of the country. The hot, asphyxiating gases rolled out of the crater, and many were scorched and suffocated.
Hot mud falling from the cloud above stuck to the flesh of the unfortunate victims, causing bad wounds. Great blocks of stone were thrown out of the eastern side of the crater, which could be distinctly seen at a distance of four miles."
Concerning the eruption of Mount Pelee, Mr. Hovey said: "An increase in the temperature of the lake in the old crater of Pelee was observed by visiting geologists as much as two years ago, while hot springs had long been known to exist near the western base of the mountain and four miles north of St. Pierre. The residents of Martinique, however, all considered the volcano extinct in spite of the eruption fifty-one years ago. The ground around the crater of Pelee was reported in 1901 to consist of hot mud, showing that the increase of temperature observed eighteen months earlier had continued.
"Soon after the middle of April, this year, manifestations of renewed activity were more p.r.o.nounced. Ashes began to fall in St. Pierre and heavy detonations were heard. The houses of the city shook frequently, suffocating gases filled the air at intervals, and the warning phenomena increased until they became very alarming.
"The Guerin sugar factory, on Riviere Blanche, was overwhelmed on May 5 by a stream of liquid mud, which rushed down the west slope of the mountain with fearful rapidity. The pretty lake which occupied the crater of 1851, on the southwest slope of the cone, about a mile from the extreme summit and a thousand feet below it, had disappeared, and a new crater had formed on its site, spreading death and destruction on all sides. Three days later the eruption took place and devastated the city of St. Pierre, wiping out the inhabitants and changing a garden spot to a desert.
"A vast column of steam and ashes rose to a height of four miles above the sea, as measured by the French artillerymen at Fort de France.
After this eruption the mountain quieted somewhat, but burst forth again at 5:15 o"clock on the morning of May 20. This explosion was more violent than that which destroyed St. Pierre.
"On this occasion the volume of steam and ashes rose to a height of seven miles, according to measurements made by Lieutenant McCormick.
An examination of the stones which fell at Fort de France showed them to be of a variety of lava called hornblende and andesite. They were bits of the old lava forming a part of the cone. There was no pumice shown to me, but the dust and lapilli all seemed to be composed of comminuted old rock.
"It is evident that the tornado of suffocating gas which wrecked the buildings asphyxiated the people, then started fire, completing the ruin. This accords with the statement which has been made that asphyxiation of the inhabitants preceded the burning of the city. The gas being sulphureted hydrogen, was ignited by lightning or the fires in the city. The same tornado drove the ships in the roadstead to the bottom of the sea or burned them before they could escape.
"Mud was formed in two ways--by the mixture in the atmosphere of dust and condensed steam and by cloudbursts on the upper dust-covered slopes of the cone washing down vast quant.i.ties of fine light dust. No flow of lava apparently has attended the eruption as yet, the purely explosive eruptions thus far bringing no molten matter to the surface.
The great emission of suffocating gas and the streams of mud are among the new features which Pelee has added to the scientific knowledge of volcanoes."
Professor Hill was the first man who set foot in the area of craters, fissures, and fumaroles, and, because of his high position as a scientist, his story was valuable. He reported as follows:
"There were three well marked zones: First, a center of annihilation, in which all life, vegetable and animal, was utterly destroyed--the greater northern part of St. Pierre was in this zone; second, a zone of singeing, blistering flame, which also was fatal to all life, killing all men and animals, burning the leaves on the trees, and scorching, but not utterly destroying, the trees themselves; third, a large outer, nondestructive zone of ashes, wherein some vegetation was injured.
"The focus of annihilation was the new crater midway between the sea and the peak of Mount Pelee where now exists a new area of active volcanism, with hundreds of fumaroles or miniature volcanoes. The new crater is now vomiting black, hot mud, which is falling into the sea.
Both craters, the old and the new, are active.
"The destruction of St. Pierre was due to the new crater. The explosion had great superficial force, acting in radial directions, as is evidenced by the dismounting and carrying for yards the guns in the battery on the hill south of St. Pierre and the statue of the Virgin in the same locality, and also by the condition of the ruined houses in St. Pierre. According to the testimony of some persons there was an accompanying flame. Others think the incandescent cinders and the force of their ejection were sufficient to cause the destruction. This must be investigated. I am now following the nature of this."
Professor Hill started on Monday, May 26, to visit the vicinity of Mount Pelee, and returned to Fort de France Wednesday morning, nearly exhausted. Professor Hill was near the ruins of St. Pierre on Monday night during the series of explosions from Mount Pelee, and was able to describe the volcanic eruption from close observation. Speaking personally of his expedition he said: "My attempt to examine the crater of Mount Pelee has been futile. I succeeded, however, in getting close to Morne Rouge. At seven o"clock on Monday night I witnessed, from a point near the ruins of St. Pierre, a frightful explosion from Mount Pelee and noted the accompanying phenomena. While these eruptions continue, no sane man should attempt to ascend to the crater of the volcano. Following the salvos of detonations from the mountain, gigantic mushroom-shaped columns of smoke and cinders ascended into the clear, starlit sky, and then spread in a vast black sheet to the south and directly over my head. Through this sheet, which extended a distance of ten miles from the crater, vivid and awful lightning-like bolts flashed with alarming frequency. They followed distinct paths of ignition, but were different from lightning in that the bolts were horizontal and not perpendicular. This is indisputable evidence of the explosive oxidation of the gases after they left the crater. This is a most important observation and explains in part the awful catastrophe. This phenomenon is entirely new in volcanic history.
"I took many photographs, but do not hesitate to acknowledge that I was terrified. But I was not the only person so frightened. Two newspaper correspondents, who were close to Morne Rouge some hours before me, became scared, ran three miles down the mountain, and hastened into Fort de France. The people on the north end of the island are terrified and are fleeing with their cattle and effects. I spent Tuesday night in a house at Deux Choux with a crowd of 200 frightened refugees.
"Nearly all the phenomena of these volcanic outbreaks are new to science, and many of them have not yet been explained. The volcano is still intensely active, and I cannot make any predictions as to what it will do."
CHAPTER XXIV.
TERRIBLE VOLCANIC DISASTERS OF THE PAST.
BY TRUMBULL WHITE.
=Destruction of Sodom and Gomorrah and the Other Cities of the Plain--The Bible Account a Graphic Description of the Event--Ancient Writers Tell of Earthquakes and Volcanoes of Antiquity--Discovery of Buried Cities of which no Records Remain--Formation of the Dead Sea--The Valley of the Jordan and Its Physical Characteristics.=
In the history of earthquakes, nothing is more remarkable than the extreme fewness of those recorded before the beginning of the Christian era, in comparison with those that have been registered since that time. This may be partly accounted for by the fact that before the birth of Christ, there was but a small portion of the habitable surface of the globe known to those who were capable of handing down a record of natural events. The vast increase in the number of earthquakes in recent times is, therefore, undoubtedly due to the enlargement of our knowledge of the earth"s surface, and to the greater freedom of communication now subsisting among mankind.
Earthquakes might have been as frequent throughout the entire globe in ancient times as now; but the writers of the Bible, and the historians of Greece and Rome might have known nothing of their occurrence. Even at the present time, an earthquake might happen in Central Africa, or in Central Asia, of which we would never hear, and the recollection of which might die out among the natives in a few generations. In countries, too, which are thinly inhabited, and where there are no large cities to be overthrown, even great earthquakes might happen almost unheeded. The few inhabitants might be awe-struck at the time; but should they sustain no personal harm, the violence of the commotion and the intensity of their terror would soon fade from their memories.
Dr. Daubeny, in his work on volcanoes, cites an example of this complete oblivion, even when the event must have occurred not far from the ancient center of civilization. The town of Lessa, between Rome and Naples, and not far from Gaeta, stands on an eminence composed of volcanic rocks. In digging the foundations for a house at this place some years ago, there were discovered, many feet beneath the present surface, a chamber with antique frescoes and the remains of an amphitheater. Yet there is not only no existing account of the destruction of a town on this site, but not even a tradition of any volcanic eruption in the neighborhood.
The earthquake which destroyed Sodom and Gomorrah is not only the oldest on record, but one of the most remarkable. It was accompanied by a volcanic eruption, it upheaved a district of several hundred square leagues, and caused the subsidence of a tract of land not less extensive, altering the whole water system and the levels of the soil.