Who’s Fault is it?

By: Mai Vo, Gabby Amini, and Jessie Bacon

Definition of Fault

• Fault: a fracture in Earth’s lithosphere along which blocks of rock move past each other

The Fault Under Horizon

• Named: Horizon Fault• Located completely beneath Horizon School• Because Horizon is on the fault the earthquake

would cause thousands of dollars in repairs• The fault would make Horizon crack in half and

collapes • It is a strike-slip fault ( you will learn what this

fault is in a moment)

Strike- slip Fault

• Example: San Andrea’s Fault• Definition: a strike-slip fault is a fault in which

the surface on opposites of the fault plane have moved horizontally and parallel to the strike of fault

• A strike- slip fault is a transformation fault• Described to move “side by side”• 2 types of strike- slip faults are: left-lateral

(meaning that it moves horizontally to the left) right- lateral (moves horizontal to the right)

• Haiti’s earthquake was caused by a left- lateral fault

Normal Fault• Example: Great Rift Valley of Africa • Definition: It is a fault in which the hanging wall has

moved downward• Because the hanging wall moves downward, younger

rocks are placed over the older rock• Over time they can form mountains and valleys• Earthquakes along faults are common near boundaries

where tectonic plates are moving apart• They typically fall at 40 and 70 degree angles, low

angled ones fall at 10 degrees or less and have very interesting problem for structural geologists

• Structural geologists : study of the three-dimensional falling of rock units

Reverse Fault• Example: The Himalaya Mountains rise in an area

where the Eurasia Plate is being pushed by the Indian Plate; it brings a lot of earthquakes

• Definition: Along the reverse fault a block of rock that the fault plane moves up which is relative to another block

• They can occur near collision zone boundaries between plates

• The movement of rocks along normal and reverse faults push up mountains which forms deep valleys

Who did what?

• Mai- Strike- slip fault slide• Gabby- Normal fault slide• Jessie- Reverse fault slide• All- Power point, props• We all worked at Mai’s house

ResourcesNormal Faults, Geology of the National Parks, February 4th, 2010,

http://www.uoregon.edu/~millerm/Nfaults.html Michael Ritter, Types of Faults, The Physical Environment, February 4, 2010http://www.uwsp.edu/geo/faculty/ritter/geog101/textbook/tectonics_landforms/faulting_p2.html Unknown Author, Fault Geology, Wikipedia The Free Encyclopedia, February 7, 2010http://en.wikipedia.org/wiki/Strike_slip_fault

Paul Preuss, Living on the Fault line, Energy and Earth Sciences, February 8, 2010http://www.lbl.gov/Science-Articles/Research-Review/Highlights/1998/EES_fault.html

Multiple Authors, The Changing Earth, McDougal Littell, Washington D.C., 2007

Unknown Author, Normal Fault & Reverse Fault, Structural Geology, February 7, 2010, http://facweb.bhc.edu/academics/science/harwoodr/Geol101/study/structur.htm

Mai’s house, supplies and parents