Monday, May 26, 2008

Mount Ararat

Mount Ararat (16,940 feet, 5165 m) is the largest volcano in Turkey. Although not currently active, its most recent eruption has probably been within the last 10,000 years. It is located in extreme northeastern Turkey, near the borders with Iran and Armenia. Southwest of the main peak lies Little Ararat (12,877 feet, 3896 m). Ahora Gorge is a northeast-trending chasm dropping 6000 feet from the top of the mountain and was the focus of a major earthquake in 1840. A number of claims by different explorers to have found remnants of Noah’s Ark on Mt. Ararat have led to continuing expeditions to the mountain, many of which have focused their searches on the gorge area.

Ararat consists of two volcanic peaks: Big Ararat (5137 m) and Little Ararat (3,914m). The top of Big Ararat is covered with snow all year long. The Old Testament story of Noah says that Noah’s ark came to rest on Ararat following the Great Flood. This image is a 3-D perspective view looking from the southwest, created by draping a simulated natural color image over an ASTER-derived digital topography model. The image was acquired on 25 June 2002, and is located at 39.75 degrees North latitude, 44.4 degrees East longitude

Tuesday, May 20, 2008

Mount Jefferson

Mount Jefferson is located in the Mount Jefferson Wilderness area and the Warm Springs Indian Reservation, approximately 115 kilometers souteast of Portland, Oregon, and 80 kilometers northwest of Bend, Oregon. Highway 22 east of Salem, Oregon, provides access to Forest Service roads and trails with lead into the wilderness area.

Mount Jefferson is a prominent feature of the landscape seen from highways east and west of the Cascades. Mount Jefferson (one of thirteen major volcanic centers in the Cascade Range) has erupted repeatedly for hundreds of thousands of years, with its last eruptive episode during the last major glaciation which culminated about 15,000 years ago

Lava Flows:
The youngest lava flows in the Mount Jefferson area are basaltic lava flows from Forked Butte and an unnamed butte south of Bear Butte. Both of these flows postdate the large eruption of Mount Mazama (Crater Lake) of about 7,600 years ago.

Saturday, May 17, 2008

Mount St. Helens

Mount St. Helens, Washington, is the most active volcano in the Cascade Range. Its most recent series of eruptions began in 1980 when a large landslide and powerful explosive eruption created a large crater, and ended 6 years later after more than a dozen extrusions of lava built a dome in the crater. Larger, longer lasting eruptions have occurred in the volcano's past and are likely to occur in the future. Although the volcano seems to have returned to a period of quiet, scientists with the U.S. Geological Survey and University of Washington Geophysics Program continue to closely monitor Mount St. Helens for signs of renewed activity.

Within 15 to 20 seconds of a magnitude 5.1 earthquake at 8:32 a.m., the volcano's bulge and summit slid away in a huge landslide - the largest on Earth in recorded history. The landslide depressurized the volcano's magma system, triggering powerful explosions that ripped through the sliding debris. Rocks, ash, volcanic gas, and steam were blasted upward and outward to the north. This lateral blast of hot material accelerated to at least 300 miles per hour, then slowed as the rocks and ash fell to the ground and spread away from the volcano; several people escaping the blast on its western edge were able to keep ahead of the advancing cloud by driving 65 to 100 miles an hour! The blast cloud traveled as far as 17 miles northward from the volcano and the landslide traveled about 14 miles west down the North Fork Toutle River.

The lateral blast produced a column of ash and gas (eruption column) that rose more than 15 miles into the atmosphere in only 15 minutes. Less than an hour later, a second eruption column formed as magma erupted explosively from the new crater. Then, beginning just after noon, swift avalanches of hot ash, pumice, and gas (pyroclastic flows) poured out of the crater at 50 to 80 miles per hour and spread as far as 5 miles to the north. Based on the eruption rate of these pyroclastic flows, scientists estimate that the eruption reached its peak between 3:00 and 5:00 p.m. Over the course of the day, prevailing winds blew 520 million tons of ash eastward across the United States and caused complete darkness in Spokane, Washington, 250 miles from the volcano.

During the first few minutes of this eruption, parts of the blast cloud surged over the newly formed crater rim and down the west, south, and east sides of the volcano. The hot rocks and gas quickly melted some of the snow and ice capping the volcano, creating surges of water that eroded and mixed with loose rock debris to form volcanic mudflows (lahars). Several lahars poured down the volcano into river valleys, ripping trees from their roots and destroying roads and bridges.

The largest and most destructive lahar was formed by water seeping from inside the huge landslide deposit through most of the day. This sustained flow of water eroded material from both the landslide deposit and channel of the North Fork Toutle River. The lahar increased in size as it traveled downstream, destroying bridges and homes and eventually flowing into the Cowlitz River. It reached its maximum size at about midnight in the Cowlitz River about 50 miles downstream from the volcano.

Thursday, May 15, 2008

The Holy Mountain of India

Badrinath is a Hindu holy town and a nagar panchayat in Chamoli district in the state of Uttarakhand, India. It is the most important of the four sites in India's Char Dham pilgrimage. Badrinath is in the Garhwal hills, on the banks of the Alaknanda River, at an elevation of 3133 m. The town lies between the Nar and Narayana mountain ranges and in the shadow of Nilkantha peak (6,560m). Badrinath is located 301km north of Rishikesh. From Gaurikund (near Kedarnath) to Badrinath by road is 233km.

Badrinath was established as a major pilgrimage site by Adi Shankara in the ninth century. In recent years its popularity has increased significantly, with an estimated 600,000 pilgrims visiting during the 2006 season, compared to 90,676 in 1961. The temple in Badrinath is also a sacred pilgrimage site for Vaishnavites.

Badrinath has been mentioned as a holy place in scriptures and legends for thousands of years. According to the Srimad Bhagavatam, "There in Badrikashram the Personality of Godhead (Vishnu), in his incarnation as the sages Nara and Narayana had been undergoing great penance since time immemorial for the welfare of all living entities." (Srimad Bhagavatam 3.4.22)

Wednesday, May 14, 2008

Mount Rainier

Mount Rainier at 4,393 meters (14,410 feet) the highest peak in the Cascade Range is a dormant volcano whose load of glacier ice exceeds that of any other mountain in the conterminous United States. This tremendous mass of rock and ice, in combination with great topographic relief, poses a variety of geologic hazards, both during inevitable future eruptions and during the intervening periods of repose. This report,
(1) explains the various types of hazardous geologic phenomena that could occur at Mount Rainier,
(2) shows areas that are most likely to be affected by the different phenomena,
(3) estimates the likelihood that the areas will be affected, and
(4) recommends actions that can be taken to protect lives and property.

Mount Rainier is carefully monitored for signs of volcanic reawakening, and an eruption that could produce a catastrophic lahar initiated by vigorous release of meltwater is expected to follow days, weeks, or even months of readily detected symptoms of volcanic unrest. Thus, it is likely that there will be opportunity for citizens and communities to prepare for an impending eruption.

Monday, May 12, 2008

Mount Baker

Mount Baker dominates the skyline from Bellingham, Washington, and Vancouver, British Columbia. On cold, clear winter days, dramatic increases in the steam plume rising continuously from Sherman Crater can alarm local residents. This apparent increase in plume vigor occurs because of condensation of steam in cold, calm air. In 1975, however, increased steaming and melting of snow and ice around Sherman Crater did signify a change in heat output from the volcano's interior. Although the increased heat flow gradually subsided, it could have signaled the start of eruptive activity, and precautions were wisely undertaken. So that the public can be warned of, and be prepared for, future eruptions and other hazardous events at Mount Baker, U.S. Geological Survey (USGS) scientists are studying the volcano's past behavior and monitoring its current activity.

Modern Mount Baker formed during and since the last ice age, which ended about 15,000 years ago. Lava flows from the summit vent erupted between 30,000 and 10,000 years ago and, during the final stages of edifice construction, blocky pyroclastic flows poured down most of the volcano's drainages. An eruption 6,600 years ago produced a blanket of ash that extended more than 20 miles to the northeast. This eruption probably occurred from the presently ice-filled summit crater. Subsequently, sulfurous gases have found two pathways to the surface— Dorr Fumaroles, northeast of the summit, and Sherman Crater, south of the summit. Both these area are sites of pervasive bedrock alteration, converting lavas to weak, white-to-yellow material rich in clays, silica, and sulfur-bearing minerals. At Sherman Crater, collapses of this weakened rock created lahars in 1843 and as recently as the 1970's.

Saturday, May 10, 2008

Mt.Aconcagua

As the tallest mountain in South America, Cerro Aconcagua (or Aconcagua Mountain) is one of the Seven Summits: the highest peaks on each of the seven continents. Its name is believed by many to come from an ancient native name of “Ackon Cahuak” meaning “Stone Sentry.” It is 6,962 meters (22,840 feet) to the top of the North Peak, making it the second highest of the Seven Summits. Aconcagua is located in the midst of the Central Andes in Argentina, one range east of the ridgeline that defines the border with Chile.

The first recorded attempt to climb the mountain’s summit occurred in 1833 by the German explorer, Paul Gussfeldt. Despite the limitations of mountaineering equipment in that era, very limited cartographic information, and with no knowledge of the conditions around the summit, he nevertheless managed to climb to within 500 meters of the summit

Friday, May 9, 2008

Aravalli Range

The Aravalli Range is a range of mountains in western India running approximately 300 miles from northeast to southwest across Rajasthan state. The northern end of the range continues as remote hills and rocky ridges into Haryana state, ending near Delhi. The uppermost mountain is Guru Shikhar in Mount Abu. Increasing to 5653 feet (1723 meters), it deception near the southwestern extremity of the range, close to the border with the Gujrat District. The city of Ajmer with its lake lies on the south slope of the range in Rajasthan.

The Aravalli Range is the worn stub of a range of very old folded mountains. The range rose in a Precambrian event called the Aravalli-Delhi orogen. The range joins two of the ancient segments that make up the Indian craton, the Marwar segment to the northwest of the range, and the Bundelkhand section to the southeast. As mentioned Aravali hills are from between the oldest of the old fold mountains and collectively form the Aravali hill range in Rajasthan in West India, they extend till Delhi in the heart of India.

Old Fold Mountains are exemplify by having stopped rising higher owing to the cessation of upward push caused by the stopping of lobby group of the tectonic plates in the Earth's crust below them. In ancient times they were enormously high but as have shabby down almost completely by millions of years of weathering. In bleak contrast Himalayas are continuously rising young fold mountains of today.

Thursday, May 8, 2008

Mount Assiniboine

Mount Assiniboine Provincial Park is a magnificent place of shimmering lakes, glistening glaciers, sky scrapping peaks and sun-dappled alpine meadows. World renowned Mount Assiniboine, at an elevation of 3,618 metres, is situated along the continental divide near the south east corner of the park and has defined mountain splendour in the Canadian Rockies for over 100 years.

Mount Assiniboine Provincial Park is located west of the British Columbia-Alberta border 48 km southwest of Banff. The park is roughly triangular in shape. The apex of this triangle is at the junction of the boundaries of Banff National Park, which forms the eastern boundary, and Kootenay National Park, which marks the boundary to the west. The southern boundary follows the height of land above Daer Creek and Extension Creek from Kootenay National Park to the Mitchell River, then easterly to Banff National Park and the Continental Divide. The most popular hiking trails to the core area of the park start from Kootenay National Park to the west, and from Spray Lakes via Bryant Creek (Banff National Park) located south of Canmore, from Sunshine Meadows west of the Banff townsite, in Banff National Park, Alberta.

Wednesday, May 7, 2008

Mount Whitney

Mt. Whitney can be most directly reached by a 10.7 mile (17.1 km) trail from Whitney Portal, 13 miles (21 km) west of the town of Lone Pine on the east side of the Sierra. Ice axes and crampons are needed in spring and early summer, but technical climbing equipment is not usually necessary between mid-July and early October. The elevation at the trailhead is 8360' (2550 meters). The elevation at the summit is 14,491' (4417 meters). Permits for this trailhead must be obtained through the Inyo National Forest.

Many visitors to Sequoia and Kings Canyon National Parks are interested in seeing Mt. Whitney, the tallest mountain in the "lower 48" states. However, Mt. Whitney is on the east side of the Great Western Divide, a chain of mountains that runs north/south through the center of Sequoia National Park, "dividing" the watersheds of the Kaweah River to the west and the Kern River to the east. Because many of the snowcapped peaks in the Great Western Divide reach altitudes of 12,000' (3657 meters) or higher, it is impossible to see over them to view Mt. Whitney from any of the roads on the west side of the Sierra. The best place from which to see Mt. Whitney is the Interagency Visitor Center on Highway 395, just south of the town of Lone Pine on the east side of the Sierra. Highway 395 can be reached via Tioga Pass in Yosemite National Park (open summer only), or by going around the southern end of the Sierra from the town of Bakersfield. There are no roads across the Sierra in Sequoia and Kings Canyon National Parks.

Tuesday, May 6, 2008

The Baltoro Glacier


The Baltoro Glacier, at 57 kilometers extended, is one of the best ever glaciers outside of the Polar Regions. It is positioned in Baltistan, in the Northern Areas of Pakistan, and runs through part of the Karakoram mountain range. The Baltoro Muztagh lies to the north and east of the glacier, as the Masherbrum Mountains lie to the south. At 8,611 m (28,251 ft), K2 is the highest mountain in the region, and three others within 20 km top 8,000 m.

The glacier gives rise to the Shigar River, which is a tributary of the Indus River. Several large tributary glaciers feed the main Baltoro glacier. The channel of this glacier is very wide and its central part is a vast snowfield. Small valley glaciers form icefalls where they meet the trunk glacier. The sidewalls vary from very steep to precipitous. The glacier has carved striations on the surrounding country rocks. Moving ice has formed depressions, which serve as basins for numerous glacial lakes