Mass Wasting
Exercise 2: Mass Wasting
Mass wasting is a phenomenon that has resulted in over one million deaths and billions of dollars of damage in its recorded history. Mass wasting is classified by the rate at which debris moves down slope. For instance, rockfalls move at speeds of over thirty-MPH, while mudslides travel at around twenty MPH. This field trip explored two translational slides; one at the Gros Ventre River in Wyoming, and the other at the Madison River in Montana.
In Wyoming, the slide was caused by the clay and silt being saturated by rain and melt water, and occurred on a slip plane almost parallel with the slope. 40 million cubic meters of debris was moved and deposited almost 300 feet up the opposite slope. The debris caused a natural dam that created a lake, but the dam eventually failed, causing a nearby town to be nearly destroyed.
In Montana, the slide was triggered by an earthquake. As in Wyoming, the debris caused a natural dam, but the Army Corps of Engineers breached the dam to prevent failure. The rock that was displaced was mostly schist and gneiss, which is unstable.
The critical thinking section asked you to place a development. The northeast quadrant was the best because it had the proper amount of rainfall, a slope that was not too steep, and dense foliage. All of these are factors that help prevent landslides.
Exercise 9: Land Use
This fieldtrip takes us to the city of South San Francisco. This city has a diverse economy that includes tourism and technology. Also, the residential areas of town are separated from the commercial areas. There are also a good number of recreational and educational facilities in the city. As far as ethnic diversity, there are many types of ethnic groups spread throughout the city; there are really no ethnic boundaries as there are in bigger, older cities. There is a great deal of diversity in the physiography of the region. The eastern part of the city is made of filled land and subject to liquefaction. The western part of the city is quite hilly and poses a landslide threat.
In Barbara Berlund’s Making San Francisco American: Cultural Frontiers in the Urban West, Berlund explains how San Francisco grew from a young settlement which grew rapidly thanks to in part of the California Gold Rush which took place in 1949. Of course with the growing of this small settlement came it’s conflicts and how it rised to where it stands present day. A primary factor which helped San Francisco flourish a ton was the influence from those who had power and chose what would happen throughout the city, for example the Big 4. Those who were wealthy did not make this city what it is today without the help of people who made up the middle class as well. Every establishment within this city set the social order as to how the inhabitants of San Francisco would go about their life in society.
...e morphed it into the quartzite that is seen surrounding the butte (4). Rocks that undergo this process are called metamorphic rock, which is the same as the rock seen years ago by dinosaurs and other extinct creatures. The quartzite rocks were formerly seafloor sediment that was forced upwards, and then surrounded by lava basalt flows. Once erupted through fissures and floods through out most of the area, lava flow eventually created enough basalt to form a thickness of about 1.8 kilometers (1). All of this basalt flow eventually led to the covering of most mountains, leaving the buttes uncovered. The igneous lava flows and loess is reasons that the Palouse consists of such sprawling hills, and rich soil for farming (2). In result of the lava flows, the Precambrian rock Quartzite was formed. And lastly covered by the glacial loess, which were carried by the wind.
The South Fork Dam collapsed and unleashed 20 million tons of water from its reservoir. A wall of water, reaching up to 70 feet high, swept 14 miles down the Little Conemaugh River Valley, carrying away steel mills, houses, livestock and people. At 4:07 p.m., the floodwaters rushed into the industrial city of Johnstown, crushing houses and downtown businesses in a whirlpool that lasted 10 minutes. (New York Times, 1889).
Most of Arizona’s earthquakes are associated with the San Andreas fault as most of Arizona’s earthquakes are shocks from epicenters located in California. Arizona has had earthquakes with epicenters located in its borders and just like the ones located near the San Andreas fault, they are linked to a transform plate boundary and are dip-slip earthquakes. Much of the focus of these earthquakes can be centered around the Grand Canyon as much of the after-effects of these earthquakes caused phenomenons to occur in the Grand Canyon. Many rockslides took place in the Grand Canyon and plenty of the cracks found in the canyon’s rock layers are attributed to some of the earthquakes that took place in Arizona since the geologic landscape formed its current
Los Angeles is a place with a dynamic history. It has grown to be one of the most diverse cities in the world as a whole. Despite the diversity for which it is known for, the city has always had a striving conflict due to racial and class tension. The social stratification of its past continues to take its toll as dividing lines persist in contemporary Los Angeles. Furthermore, these dividing lines redefine place in Los Angeles, whether geographically or personally, to be subject to race and class. Fluidity has become evident recently however it is more common for the identity of people to be fixed in society. Through the novel Southland, by Nina Revoyr, and various means of academic sources, one is further able to explore the subject of race, place, and reinvention in Los Angeles.
Often, the effects of Mountain top Removal are disastrous, the wildlife habitat is damaged and vegetation loss usually leads to numerous floods and landslides. When explosives are used, fly rock, ...
The Little Missouri River eroding the mountain range is the reason that the park is as it looks today. The park is believed to be <60 million years old. Over 60 million years ago volcanos all over the west were erupting and spitting out amounts of ash. The rivers near the volcanos were gathering. The rivers began to dry out, leveeing the ash behind. The ash was being dried in layers and turned into sandstone, siltstone and mudstone while the ash layers became bentonite clay. This Bentonite clay is dangerous because it gets people stuck, like quick sand it is located throughout the park. It can pull the car tires un...
The eruptions of Mount Rainier produce lahar mudflows which are similar to pyroclastic flows except they contain more water. These mudflows carry debris of volcanic ash and boulders that produce lava flows and have the consistency of concrete flowing down a mountain (C.M. Riley). Lahars can flow up to 100 kilometers per hour and can extend out to more than 300 kilometers in distance. Because they are hard to predict, give off little warning signs, and move so rapidly through valleys, lahar slides are considered to be one of the most deadly volcanic hazards.
...se two tectonic plates generated intense friction and pressure that generated enough heat to melt rocks. The descent of denser oceanic Farallon Plate into the asthenosphere produced magma that was made from basalt or andesite. Which is dark colored rocks with little silica. The buoyant magma pushed through the silica-rich continental crust, partially melting the crust that it moved though, and becoming more granitic in composition. About 100 million years ago, the granitic magma pooled at depths of only 2 to 5 miles beneath the surface (United States of America). The granitic terrain that makes up the Sierra, was once thought to have only local variations but was produced from one large mass of rock. It has been discovered however that hundreds of intrusions caused the variations in the granite that is displayed in Yosemite and in the Sierra Nevada range (Huber).
Both African-Americans and Native-Americans, were able successfully able to develop very urbanized communities that were functionally similar, but culturally and ethnically distinct. There were various similarities and differences between the two groups East Bay and LA, such as the motivations of such groups to move to California; how both groups were able to discover collectivism and community; how there was a progression from the first generations to the second; and the overall cultural and other impacts that such groups left in California.
Ice dams in the Clark Fork area that backed up Glacial Lake Missoula actually caused some of the largest floods known to man. As ice will float, these ice dams would periodically rise up and burst, catastrophically flooding the Rathdrum Prairie, eastern Washington and into northern Oregon. Locally, these floods brought in glacial till and deep deposits of outwash that obliterated the St. Joe River once running through the Rathdrum Prairie. The southernmost edge of these deposits terminated where Coeur d’Alene exists today, damming the old St. Joe River and creating Lake Coeur d’Alene (Alt and Hyndman, 73). The new lake received the entire flow of the Coeur d’Alene and St. Joe Rivers, more than could be absorbed through the gravel deposits, thereby causing the lake to overflow and seek a new course, now known as the Spokane Ri...
It is seen from the moment you get here, to the moment you leave, and I believe that that is the reason why California is so memorable. The diversity that is seen is in our history as well, which can allow outsiders to understand where we our diversity rooted from. In the lecture named “Space, Identity, and Public Power in Nineteenth-Century Los Angeles”, Dr. Daniel Torred- Rouff defined race as a “system of power”, which can mean that race is man-made divider of people, and it has affected each and every state, but California has been moving in a progressive way to end or lower the risk of any racial altercations. The largest groups of race have some sort of history here, from Latinos to Asian, and these races have helped built California from the ground up, which can be seen in the rail roads and the agriculture. This cultural diversity has built and sustained this state afloat, and that diversity will continue to grow, because of the progressive mind set of
Gentrification is a highly important topic that has not only been occurring all over the United States, but especially closer than we may have thought. San Francisco is home to hundreds of thousands of people who have been a part of how amazing this city has become. San Francisco is one of the most visited places in the world with many of its famous landmarks, endless opportunities not only for daytime fun but also has an amazing nightlife that people cannot get enough of. People come for a great time and could not be done without the help of the people who have grown up to experience and love this city for what it truly is. The cost of living in such an important city has definitely had its affect of lower income San Francisco residents. For decades we have seen changes occurring in parts of San Francisco where minorities live. We have seen this in Chinatown, SOMA, Fillmore district, and especially the Mission district.
Los Angeles: A Diverse Metropolis. People always wonder why the City of Angels is different from other cities. This paper will answer this question and explain the uniqueness that makes L.A., “L.A.” Los Angeles, since its birth as an embryonic city, has become one of the most diverse metropolises, offering to the public what no other city can. This paper will emphasize the relationship between the federal government and the western United States.
Mudslides usually occur in hilly areas, for an example, when there was a mudslide in Bangladesh few months back, it occurred at Chittagong. Mudslides occur when a portion of a hill side becomes too weak to hold up its own weight. This is generally caused by an intense amount of rain fall. With all of the new water introduced into the slope the content of liquid makes it so heavy that gravity pulls it downward. Although water plays a major factor in creating the mud that flows in a mudslide the real reason that the land begins to slide is gravity. What happens is mudslides redistribute soil and sediments in a process that can be in abrupt collapses or in slow gradual slides.