The Cascade Mountains in Washington, Oregon, and northern California are one of the best examples of such a landscape; from its low swelling summits rise at intervals the powerful master cones of Shasta, Rainier, Adams, Hood, Baker, and others. Fujiyama, the celebrated mountain of j.a.pan, may be cited as a familiar example of the basic mountain form, the single-cone volcanic peak. Vesuvius is a familiar example of simple complication, the double-cone volcano, while Mauna Loa in Hawaii, including Kilauea of the pit of fire, a neighbor volcano which it has almost engulfed in its swollen bulk, well ill.u.s.trates the volcano built up by outpourings of lava from vents broken through its sides. Flat and rolling Yellowstone with its geyser fields, is one of the best possible examples of a dead and much eroded volcanic region.

The scenic detail of the volcanic landscape is interesting and different from any other. Centuries and the elements create from lava a soil of great fertility. No forests and wild flowers excel those growing on the lavas of the Cascades, and the fertility of the Hawaiian Islands, which are entirely volcanic, is world-famous. Streams cut deep and often highly colored canyons in these broad lava lands, and wind and rain, while eroding valleys, often leave ornately modelled edifices of harder rock, and tall thin needles pointing to the zenith.

In the near neighborhood of the volcanoes, as well as on their sloping sides, are found lava formations of many strange and wonderful kinds.

Hot springs and bubbling paint pots abound; and in the Yellowstone National Park, geysers. Fields of fantastic, twisted shapes, ma.s.ses suggesting heaps of tumbled ropes, upstanding spatter cones, caves arched with lava roofs, are a very few of the very many phenomena which the climber of a volcano encounters on his way. And at the top, broad, bowl-shaped craters, whose walls are sometimes many hundred feet deep, enclose, if the crater has long been dormant, sandy floors, from which, perhaps, small cinder cones arise. If the crater still is active, the adventurer's experiences are limited only by his daring.

The entire region, in short, strikingly differs from any other of scenic kind.

Of the several processes of world-making, all of which are progressing to-day at normal speed, none is so thrilling as volcanism, because no other concentrates action into terms of human grasp. La.s.sen Peak's eruption of a thousand cubic yards of lava in a few hours thrills us more than the Mississippi's erosion of an average foot of her vast valley in a hundred thousand years; yet the latter is enormously the greater. The explosion of Mount Katmai, the rise and fall of Kilauea's boiling lava, the playing of Yellowstone's monster geysers, the spectacle of Mazama's lake-filled crater, the steaming of the Cascade's myriad bubbling springs, all make strong appeal to the imagination. They carry home the realization of mysterious, overwhelming power.

Lava is molten rock of excessively high temperature, which suddenly becomes released from the fearful pressures of earth's interior. Hurled from volcanic vents, or gushing from cracks in the earth's skin, it spreads rapidly over large neighborhoods, filling valleys and raising bulky rounded ma.s.ses.

Often it is soft and frothy, like pumice. Even in its frequent gla.s.s forms, obsidian, for example, it easily disintegrates. There are as many kinds of lava as there are kinds of rock from which it is formed.

Volcanic scenery is by no means confined to what we call the volcanic national parks. Volcanoes were frequent in many parts of the continent.

We meet their remnants unexpectedly among the granites of the Rockies and the Sierra, and the sedimentary rocks of the west and the southwest.

Several of our national parks besides those prevailingly volcanic, and several of our most distinguished national monuments, exhibit interesting volcanic interludes.

VII

La.s.sEN PEAK AND MOUNT KATMAI

THE ONE A NATIONAL PARK IN NORTHERN CALIFORNIA, THE OTHER A NATIONAL MONUMENT IN ALASKA

Because most of the conspicuous volcanic eruptions of our day have occurred in warmer climes nearer the equator, we usually think of volcanoes as tropical, or semi-tropical, phenomena. Vesuvius is in the Mediterranean, Pelee in the Caribbean, Mauna Loa and Kilauea on the Hawaiian Islands. Of course there is La.s.sen Peak in California--the exception, as we say, which proves the rule.

As a fact, many of the world's greatest volcanoes are very far indeed from the tropics. Volcanoes result from the movement of earth ma.s.ses seeking equilibrium underneath earth's crust, but near enough to the surface to enable molten rock under terrific pressure to work upward from isolated pockets and break through. Volcanoes occur in all lat.i.tudes. Even Iceland has its great volcano. It is true that the volcano map shows them congregating thickly in a broad band, of which the equator is the centre, but it also shows them bordering the Pacific Coast from Patagonia to Alaska, crossing the ocean through the Aleutian Islands, and extending far down the Asian coast. It also shows many inland volcanoes, isolated and in series. The distribution is exceedingly wide.

Volcanoes usually occur in belts which may or may not coincide with lines of weakening in the earth's crust below. Hence the series of flaming torches of prehistoric days which, their fires now extinguished and their sides swathed in ice, have become in our day the row of spectacular peaks extending from northern California to Puget Sound.

Hence also the long range of threatening summits which skirts Alaska's southern sh.o.r.e, to-day the world's most active volcanic belt. Here it was that Katmai's summit was lost in the mighty explosion of June, 1912, one of enormous violence, which followed tremendous eruptions elsewhere along the same coast, and is expected to be followed by others, perhaps of even greater immensity and power.

These two volcanic belts contain each an active volcano which Congress has made the centre of a national reservation. La.s.sen Peak, some wise men believe, is the last exhibit of activity in the dying volcanism of the Cascade Mountains. Mount Katmai is the latest and greatest exhibit in a volcanic belt which is believed to be young and growing.

THE BUILDING OF THE CASCADES

Millions of years ago, in the period which geologists call Tertiary, the pressure under that part of the crust of the earth which now is Washington, Oregon, and northern California, became too powerful for solid rock to withstand. Long lines of hills appeared parallel to the sea, and gradually rose hundreds, and perhaps thousands, of feet. These cracked, and from the long summit-fissures issued hot lava, which spread over enormous areas and, cooling, laid the foundations for the coming Cascade Mountains.

When the gaping fissures eased the pressure from beneath, they filled with ash and lava except at certain vent holes, around which grew the volcanoes which, when their usefulness as chimneys pa.s.sed, became those cones of ice and snow which now are the glory of our northwest.

There may have been at one time many hundreds of these volcanoes, big and little. Most of them doubtless quickly perished under the growing slopes of their larger neighbors, and, as they became choked with ash, the lava which had been finding vent through them sought other doors of escape, and found them in the larger volcanoes. Thus, by natural selection, there survived at last that knightly company of monsters now uniformed in ice, which includes, from north to south, such celebrities as Mount Baker, Mount Rainier, Mount Adams, Mount St. Helens, Mount Hood, vanished Mount Mazama, Mount Shasta, and living La.s.sen Peak.

Whether or not several of these vast beacons lit Pacific's nights at one time can never be known with certainty, but probability makes the claim.

Whether or not in their decline the canoes of prehistoric men found harbor by guidance of their pillars of fire by night, and their pillars of smoke by day is less probable but possible. One at least of the giant band, La.s.sen Peak, is semi-active to-day. At least two others, Mount Rainier and Mount Baker, offer evidences of internal heat beneath their mail of ice. And early settlers in the northwest report Indian traditions of the awful cataclysm in which Mount Rainier lost two thousand feet of cone.

La.s.sEN PEAK NATIONAL PARK

La.s.sen Peak, the last of the Cascades in active eruption, rises between the northern end of the Sierra Nevada Mountains, of which it is locally but wrongly considered a part, and the Klamath Mountains, a spur of the Cascades. Actually it is the southern terminus of the Cascades.

Though quiet for more than two hundred years, the region long has enjoyed scientific and popular interest because it possesses hot springs, mud volcanoes and other minor volcanic phenomena, and particularly because its cones, which are easily climbed and studied, have remained very nearly perfect. Besides La.s.sen Peak, whose alt.i.tude is 10,437 feet, there are others of large size and great interest close by. Prospect Peak attains the alt.i.tude of 9,200 feet; Harkness Peak 9,000 feet; and Cinder Cone, a specimen of unusual beauty, 6,907 feet.

Because it seemed desirable to conserve the best two of these examples of recent volcanism, President Taft in 1906 created the La.s.sen Peak and the Cinder Cone National Monuments. Doubtless there would have been no change in the status of these reservations had not La.s.sen Peak broken its long sleep in the spring of 1914 with a series of eruptions covering a period of nineteen months. This centred attention upon the region, and in August, 1916, Congress created the La.s.sen Volcanic National Park, a reservation of a hundred and twenty-four square miles, which included both national monuments, other notable cones of the neighborhood, and practically all the hot springs and other lesser phenomena. Four months after the creation of the national park La.s.sen Peak ceased activity with its two hundred and twelfth eruption. It is not expected to resume. For some years, however, scientists will continue to cla.s.s it as semi-active.

These eruptions, none of which produced any considerable lava flow, are regarded as probably the dying gasps of the volcanic energy of the Cascades. They began in May, 1914, with sharp explosions of steam and smoke from the summit crater. The news aroused wide-spread interest throughout the United States; it was the first volcanic eruption within the national boundaries. During the following summer there were thirty-eight slight similar eruptions, some of which scattered ashes in the neighborhood. The spectacle was one of magnificence because of the heavy columns of smoke. Eruptions increased in frequency with winter, fifty-six occurring during the balance of the year.

[Ill.u.s.tration: _From a photograph by J.S. Diller_

La.s.sEN PEAK SEEN FROM THE SOUTHWEST

On the left is the material last erupted from the slope of the peak. It is called Chaos]

[Ill.u.s.tration: _From a photograph by J.S. Diller_

La.s.sEN PEAK CLOSE UP

Showing the northeast slope as seen from Chaos]

About the end of March, 1915, according to Doctor J.S. Diller of the United States Geological Survey, new lava had filled the crater and overflowed the west slope a thousand feet. On May 22 following occurred the greatest eruption of the series. A mushroom-shaped cloud of smoke burst four miles upward in air. The spectacle, one of grandeur, was plainly visible even from the Sacramento Valley. "At night," writes Doctor Diller, "flashes of light from the mountain summit, flying rocket-like bodies and cloud-glows over the crater reflecting the light from incandescent lavas below, were seen by many observers from various points of view, and appear to indicate that much of the material erupted was sufficiently hot to be luminous."

Another interesting phenomenon was the blast of superheated gas which swept down Lost Creek and Hot Creek Valleys. For ten miles it withered and destroyed every living thing in its path. Large trees were uprooted.

Forests were scorched to a cinder. Snow-fields were instantly turned to water and flooded the lower valleys with rushing tides.

Later examination showed that this explosion had opened a new fissure, and that the old and new craters, now joined in one, were filled with a lava lid. Following this, the eruptions steadily declined in violence till their close the following December.

As a national park, though undeveloped and unequipped as yet, La.s.sen has many charms besides its volcanic phenomena. Its western and southern slopes are thickly forested and possess fine lakes and streams. Several thousand persons, largely motorists, have visited it yearly of late.

There are hot springs at Drakesbad, just within the southern border, which have local popularity as baths. The trout-fishing in lake and stream is excellent, and shooting is encouraged in the extensive national forest which surrounds the park, but not in the park itself, which is sanctuary. In spite of the hunting, deer are still found.

The greatest pleasure, however, will be found in exploring the volcanoes, from whose summits views are obtainable of many miles of this tumbled and splendidly forested part of California and of the dry plains of the Great Basin on its east.

THE KATMAI NATIONAL MONUMENT

We turn from the dying flutter of California's last remaining active volcano to the excessive violence of a volcano in the extremely active Alaskan coast range. The Mount Katmai National Monument will have few visitors because it is inaccessible by anything less than an exploring-party. We know it princ.i.p.ally from the reports of four expeditions by the National Geographic Society. Informed by these reports, President Wilson created it a national monument in 1918.

A remarkable volcanic belt begins in southern Alaska at the head of Cook Inlet, and follows the coast in a broad southwesterly curve fifteen hundred miles long through the Alaskan Peninsula to the end of the Aleutian Islands, nearly enclosing Behring Sea. It is very ancient. Its mainland segment contains a dozen peaks, which are cla.s.sed as active or latent, and its island segment many other volcanoes. St. Augustine's eruption in 1883 was one of extreme violence. Kugak was active in 1889.

Veniaminof's eruption in 1892 ranked with St. Augustine's. Redoubt erupted in 1902, and Katmai, with excessive violence, in June, 1912. The entire belt is alive with volcanic excitement. Pavlof, at the peninsula's end, has been steaming for years, and several others are under expectant scientific observation. Katmai may be outdone at any time.

Katmai is a peak of 6,970 feet alt.i.tude, on treacherous Shelikof Strait, opposite Kodiak Island. It rises from an inhospitable sh.o.r.e far from steamer routes or other recognized lines of travel. Until it announced itself with a roar which was heard at Juneau, seven hundred and fifty miles away, its very existence was probably unknown except to a few prospectors, fishermen, geographers, and geologists. Earthquakes followed the blast, then followed night of smoke and dust. Darkness lasted sixty hours at Kodiak, a hundred miles away. Dust fell as far as Ketchikan, nine hundred miles away. Fumes were borne on the wind as far as Vancouver Island, fifteen hundred miles away. Weather Bureau reports noted haziness as far away as Virginia during succeeding weeks, and the extraordinary haziness in Europe during the following summer is noted by Doctor C.S. Abbott, Director of the Astrophysical Observatory of the Smithsonian Inst.i.tution, in connection with this eruption.

Nevertheless, Katmai's is by no means the greatest volcanic eruption.

Katmai's output of ash was about five cubic miles. Several eruptions have greatly exceeded that in bulk, notably that of Tomboro, in the island of Sumbawa, near Java, in 1815, when more than twenty-eight cubic miles of ash were flung to the winds. Comparison with many great eruptions whose output was princ.i.p.ally lava is of course impossible.