GEO101 (MOD3 Peer discussion response)

Description

Please respond to both POST1 and POST2 in at least 200 words.
RequiredChapter 5 Weathering, Erosion, and Sedimentary Rocks (Sections 5.1 & 5.2 only) in An introduction to geology. Salt Lake Community College. Open Educational ResourceChapter 10 Mass Wasting in An introduction to geology. Salt Lake Community College. Open Educational ResourceChapter 13 Deserts in An introduction to geology. Salt Lake Community College. Open Educational ResourceChapter 14 Glaciers in An introduction to geology. Salt Lake Community College. Open Educational ResourceRecommendedIverson, R. M., George, D. L., Allstadt, K., Reid, M. E., Collins, B. D., Vallance, J. W., …, & Baum, R. L. (2015). Landslide mobility and hazards: Implications of the 2014 Oso disaster. Earth and Planetary Science Letters, 412, 197-208. National Park Service. (2019, September 11). Mass wasting. Retrieved from https://www.nps.gov/subjects/erosion/mass-wasting.htm
Omosanya, K. O., Harishidayat, D., Marheni L., Johansen, S. E., Felix, M., & Abrahamson, P. (2017). Recurrent mass-wasting in the Sorvestsnaget Basin Southwestern Barents Sea: A test of multiple hypotheses. Marine Geology, 376(2016), 175-193. doi:gor/10.1016/j.margeo.2016.03.003Using your text and the library or internet resources, research one of
the many varieties of mass wasting. Explain how it works, what type of
material is involved, and that type of movement. In which regions might
we find this type of mass wasting? Provide a real-life example of an
event of this type. Once again, make sure that you come up with an
example that hasn’t been discussed already.POST1:
Mass
wasting is when there is a downhill movement due to gravity that
consists of soil or rock material and refers to all fast-moving
material. Debris flow is a common type of mass wasting that consists of
rapid movement. “Flows are rapidly moving mass-wasting events in which
the loose material is typically mixed with abundant water, creating long
run-outs at the slope base” (Johnson, Affolter, Inkenbrandt, &
Mosher, 2017). There are two types of flows: debris flow which is made
up of coarse material, and earth flow which is made up of finer
material.
Debris flow commonly occurs from heavy rains with falls before
flowing downhill and creating sections with a surface broken by ridges
and channels. Hilly areas that are subject to long, heavy rainfalls are
more susceptible to experiencing debris flow. In the United States,
examples of these areas include Hawaii, northern California, Idaho,
Washington, and Oregon on the West, and the Appalachian Mountains on the
Central and East.
An example of debris flow in the United States actually occurred
twice in the same location! In 1995, La Conchita, California experienced
moving earth flow that damaged nine homes. A short week later, debris
flow occurred in the same exact location damaging five more homes. The
top of this slide actually had early warning signs with its tension
cracks that eventually grew larger with the heavy rainfall during the
winter of 1994/1995. This was likely the trigger that caused the earth
flow and debris flow events in 1995. Again in 2005, ten years later, a
rapid-debris flow occurred after the end of a 15-day rainfall.
“Vegetation remained relatively intact as it was rafted on the surface
of the rapid flow, indicating that much of the landslide mass simply was
being carried on a presumably much more saturated and fluidized layer
beneath” (Johnson, Affolter, Inkenbrandt, & Mosher, 2017). This
event damaged 36 homes and killed 10 people.References:
Johnson, C., Affolter, M., Inkenbrandt, P., &
Mosher, C. (2017). An introduction to geology. Salt Lake Community
College. Open Educational Resource. Retrieved from
http://opengeology.org/textbook/

POST2:Debris
flow is a type of mass wasting. A debris flow is a moving mass of loose
mud, sand, soil, rock, water, and air that travels down a slope under
the influence of gravity. To be considered a debris flow, the moving
material must be loose and capable of flowing down the slope. Usually,
the flow is not fast and it creeps down the slopes. However, the fast
ones are the ones that attract attention and become very dangerous. The
speed and volume of debris flows make them very dangerous. Every year,
worldwide, many people are killed by debris flows. This hazard can be
reduced by identifying areas that can potentially produce debris flows,
educating people who live in those areas and govern them, limiting
development in debris flow hazard areas, and developing a debris flow
mitigation plan.Highly destructive debris flows occur in many areas across the United
States. Hilly areas subject to prolonged, intense rainfall are
particularly susceptible. Areas throughout southern California and San
Francisco Bay Area, where I live, are frequently beset by debris flow
problems, and public agencies have expended vast resources on massive
debris-protection systems. Montecito, a city in California, has been a
victim of one of the deadliest debris flow. In January of 2018,
Montecito experienced heavy rainfall in a short period of time, causing
water, mud, trees, rocks, and boulders from the Santa Ynez Mountains to
flow down creeks and streams into the Montecito area.

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