The Blackhawk Landslide Lucerne Valley, California By Matt O'Hare

Slides:

Advertisements

Similar presentations

Unit 2 – Making Mountains – Earthquakes Geosc. 10 Earthquakes! Take a Quick Virtual Tour with Dr. Alley through the U.S. Forest Service Madison River Canyon.

Advertisements

Mass Movements at Earth’s Surface

Chapter 9 Water Erosion and Deposition

Mass Movements. Mass movement- The down slope movement of earth material under the influence of gravity.

Earthquake Hazards Landslides, Liquefaction, Dam Failure, Ground Rupture and Structural Collapse.

Shanese Breitkreitz San Francisco Earthquake The Great San Francisco Earthquake is also known as The Great Quake and Fire, and The Great Shake.

Motion with constant acceleration Freefall

Chapter 11 Rivers & Groundwater.

Use the map to answer the question.

Topics for today Mass Wasting (Ch ) 1. Controlling factors –Soil strength –Hill slope gradient 2 Physical model 3 Natural cases –Rain storms.

Unit 1 Lesson CHOICE 1CHOICE 2CHOICE 3 CHOICE CHOICE

EXAMPLE 6 Solve a polynomial equation City Park

Types of Mountains: 1.Folded Mountains. Pressure is applied slowly to the rock so that it bends instead of breaking. Makes folds in the rocks. 2.Faulted.

Residual/Transported Soils, Erosion, and Erosion History

What causes climate ?.

SEISMOGRAPH THE SCIENCE WHICH STUDIES EARTHQUAKES IN DETAIL IS KNOWN AS SEISMOLOGY. SEISMOGRAPH AN INSTRUMENTSWHICH MEASURES THE INTENSITY OF EARTHQUAKES.

Geography revision guide By Billy Hewson. Contents page HAAC Processes HAAC Processes (Part 1) HAAC ProcessesHAAC Processes (Part 2) HAAC Processes HAAC.

Continental Crust av. 32 km Oceanic Crust av. 8 km.

 A landslide is when a chunk of earth falls down a steep slope  it can be made of dirt, rocks or debris.

Erosion & Mass Movement. erosion is the process by which the products of weathering are transported agents of erosion are gravity, wind, glaciers, water,

Severe Weather Patterns. Hurricanes Form Over Warm Ocean Water Near the equator, warm ocean water provides the energy that can turn a low-pressure center.

What is a hurricane? A hurricane is a huge storm which can be up to 960 kilometers (600 miles) across and have strong winds spiraling inward and upward.

Mass Movements Essential Questions What are mass movements? What factors trigger mass movements?

Mass Movements SWBAT identify factors that affect mass movements; relate how mass movements affect people; analyze the relationship between gravity and.

RATES OF WEATHERING Factors of Rates of Weathering 1. Parent Material (The rocks themselves) - Igneous and metamorphic most resistant, sedimentary least.

Mass Wasting (from Ch. 15) 1. 2 mass wasting The relatively rapid movement of bedrock, debris, regolith, and/or soil down a slope a short distance Landform.

Choose a category. You will be given the answer. You must give the correct question. Click to begin.

Earthquake Hazards Landslides, Liquefaction, Dam Failure, Ground Rupture and Structural Collapse.

Landforms: Erosion & Mountain Building

Learning Objectives I can identify & explain some of the mass movements that break down materials. I can summarize the agents of erosion. I can identify.

Erosion & DEPOSITION.

Air photo showing rockfall in 1999

Extreme Weather of the Pacific Northwest

Severe Weather Patterns

Severe Weather Patterns

Mass Movements.

Mass Wasting Physical Geology 1 Chapter 9

Chapter 8 – Mass movements, Wind and Glaciers

CHAPTER 5 Folding and Faulting.

Let’s Play Jeopardy.

Rapid Changes on Earth: Earthquakes, Volcanoes, Landslides

Air Masses 10/2/12.

Ch.12, Sec.3 – Mass Movements & Erosion

Hosted by Your Science Teacher

Erosion and Deposition

Earth’s Surface was formed from a variety of geologic processes

Chapter 9 Water Erosion and Deposition

Weathering, Erosion, & Deposition

5.3: Mass Movement as rock weathers, it becomes very fine particles that form soil mass movement: process where gravity causes rock and soil to move.

RATES OF WEATHERING Factors of Rates of Weathering

Hosted by Your Science Teacher

Chapter 12 sec 4 vocabulary

Severe Weather Patterns

Chapter 5.3 Mass Movements.

Title: 8.1 Types of Mass Movements Page #: 68 Date: 2/4/2013

Do Now: Looking at the picture, what factors do you think cause the land to move suddenly or fall apart on the surface of the Earth (cause a mass movement).

Constructive & Destructive Forces on Landforms

WARM UP Write in your notebook for today’s date that the warm up was the quiz Take out your foldable and a pen or pencil.

Streams play an important role in erosion

Hosted by Your Science Teacher

Presentation transcript:

The Blackhawk Landslide Lucerne Valley, California By Matt O'Hare

Geology of the Area Mountain is a resistant mass of marble thrust northward over uncemented sandstone and weathered gneiss. Top of mountin is 6800 ft high Extensive large scale faulting North side of mountain falls 3000 feet in a mile Uplift of Blackhawk mountain occurred in two stages Over thrusting from the south Monoclinal folding along a northwest trending axis

Slide evidence Alluvial fan at foot of mountain is 100 ft thick, 2 miles wide, and 5 miles long Striation evidence shows the landslide moved as almost a nondeforming mass of breccia at nearly 100MPH At least 2 previous slides

More slide facts Slide is 30 ft thick at terminus, 100 ft thick at base 10 billion cubic ft or 700 million tons of crushed marble One of largest ever in north america

How did the slide move so far? Was not internally lubricated or slow moving like mudslides Water lubrication possible but would require massive rains Possibly air- lubrication method Compressed air allows for speed and distance as well as staying whole

Air-lubrication method Slide launched off step about 200 feet high Trapped air and compressed it upon landing Sandstone and gneiss weathered away to leave precarious slope Would have supported speeds up to 270 MPH

What can we learn from this? Landslides can move really fast Rockfall is extremely dangerous even if you are far away from it What can we do to prevent this?

Citations Monastersky R. (1992) When Mountains Fall. Sci. News 142, 136-138. Rodrigue, Frank; (2003) The Blackhawk Landslide. Shreve, Ronald; (1959) Geology and Mechanics of the Blackhawk Landslide, Lucerne Valley, California. California Institute of Technology.