San Andreas Fault
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San Andreas Fault



San Andreas Fault

San Andreas Fault
Geography 4
Chaffey College
11 May 2011



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San Andreas Fault San Andreas Fault Presentation Transcript

  • The San Andreas Fault
    Terri Amers
    Carrie Black
    Erika Mero
    Ashley O’Hare
    Ashley Stern
  • San Andreas Fault Line
    The San Andreas Fault system is located in the state of California.
    A Fault is a deep crack in the earth’s crust, most of them are found between two tectonic plate boundaries.
    San Andreas Fault was named after San Andreas Lake by geologist A.C. Lawson in 1895
  • Tectonic plates are what make up the earth’s crust where the oceans and continents rest.
    The name of the tectonic plate that sits on the east side of the San Andreas Fault Line is the North American Plate and on the west side is the Pacific Plate.
    Tectonic Plates
  • Where is it
    The fault begins in Gulf of California, and travels north through Baja, past the Salton Sea, all the way up to San Francisco and exit’s the bay where it continues to run along the coast until it ends near Eureka, California.
    The entire San Andreas fault system is more than 800 miles long and extends to depths of at least 10 miles within the Earth.
  • Northern Segment
    Creeping Segment
    Parkfield Segment
    Central Segment
    Southern Segment
    The Segments of the Fault
  • The Northern segment of the San Andreas fault extends from Shelter Cove to south of the San Francisco Bay area. 
    The Northern Segment
  • This portion of the San Andreas fault extends from San Juan Bautista, near Monterey, to the short Parkfield segment deep in the Coast Ranges.
    The Creeping Segment
  • This part of he fault is at the center of the San Andreas fault. Hardly 30 kilometers long, this segment is special because it has its own set of magnitude-6 earthquakes that don't involve the neighboring segments.
    The Parkfield Segment
  • This Segment is defined by the great rupture of 9 January 1857, a magnitude-8 earthquake that broke open the ground for about 350 kilometers from the hamlet of Cholame near Parkfield to Cajon Pass near San Bernardino. 
    The Central Segment
  • From Cajon Pass, this segment of the San Andreas fault runs about 300 kilometers to its end on the shores of the Salton Sea
    The Southern Segment
  • Right Lateral Strike-Slip Fault
    The San Andreas Fault is a right lateral strike-slip fault.
    What does this mean? It means that the left side of the fault is moving northward towards Alaska while the right side is sliding southward toward Mexico.
  • Disasters
    Result from Disasters
    Property Damage
    Property Loss
    What is the Problem
  • Historical San Andreas Earthquakes
    The Great Earthquake of 1906.
    San Francisco Earthquake of 1989 (also known as the “World Series” Earthquake
    1994 Northridge Quake
    1992Landers Earthquake
  • 1857- Fort Tejon Quake
    1899- San Jacinto Fault Quake-6.7 magnitude
    1933- Long Beach Earthquake-6.3 magnitude
    1986- North Palm Springs Quake-6.1 magnitude
    1992- Lander’s Quake-7.3 magnitude
    1994- Northridge Quake-6.7 magnitude
    1999- Hector Mine Quake-7.1 magnitude
    Other Earthquakes along Fault
  • There is no way to predict when or the exact place the earthquakes will hit.
    It is unprepared for building on the fault
    The central section runs northwest direction from Monterey county to Hollister.
    This section exhibits a phenomenon called a seismic creep, where the fault slips slowly without causing earthquakes.
    Streets crossing the fault in Hollister show major offset and several houses sitting on top of the fault are noticeably twisted or uneven.
    Effects on the San Andreas Fault
  • The earthquakes are inevitable and unpredictable along the Fault Line. Scientists continue to research ways to predict when and where the earthquakes will hit. Because the earth near the San Andreas Fault is not stable, we must prepare ourselves for possible disasters.
  • Source
    Alden, Andrew. "All About the San Andreas Fault." About Geology - The Complete Guide to Earth Science and Geology. Web. 25 Apr. 2011. <>.
    Feller, Walter. "Mojave Desert ." 2011. 11 May 2001 <>.
    Hairshirt, The Digital. The Digital Hairshirt . 24 March 2009. 5 May 2011 <>.
    K.Lynch, David. Califorina San Andreas Fault. 2006. 05 May 2011 <>.
    Wallace, Sandra S. Schulz and Robert E. The San Andreas Fault. 24 June 1997. 11 May 2011 <>.