Earthquakes and the Hayward Fault

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Earthquakes and the Hayward Fault

• Presented by the UC Berkeley Seismological
  Laboratory

Courtesy of NISEE, EERC, UC Berkeley
Flour Mill, 1868 Hayward EQ
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Q What is an Earthquake?
And
Waves spread out
Photo Horst Rademacher
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A MASSIVE Energy is Released!
Manifested at Earths surface as SHAKING and
property damage.
Image courtesy of the USGS
Image courtesy of the USGS
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What is Plate Tectonics?

• The Earths crust is broken up into large
  plates. These plates move around, driven by
  heat escaping from inside the Earth.

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Planet Earths Plates
Like interlocking puzzle pieces...
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Where do we Find Earthquakes?

• Every single black dot is one recorded
  earthquake...

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The Infamous Ring of Fire!
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Faults of the Bay Area
We live in earthquake country!
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What is the Hayward Fault?

• Standing on one side of the fault, the other side
  will appear to move to the right.

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Where is the Hayward Fault found?

• The Hayward Fault runs along the base of the East
  Bay Hills.

• Currently, the fault is thought to have an
  earthquake recurrence interval of about 17029
  years!
• If the last earthquake occurred in 1868

Image courtesy of USGS
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Historical Bay Area Earthquakes

• Hayward, M 7.0, 1868
• Along the Hayward Fault
• South Hayward, M 5.8, 1865
• Along the Hayward Fault
• Loma Prieta, M. 6.9, 1989
• Along the San Andreas Fault

MORAL OF THE STORY Bay Area earthquakes have
occurred in the past and will occur again in the
future. We need to be prepared!
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How do We Measure Earthquakes?

• Seismic waves leave an Earthquakes focus and
  move out through the Earth.
• Seismologists record these waves at Earths
  surface, using seismometers.

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Seismometers, Past and Present
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Life near the Hayward Fault
Some faults never sleep!
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How Can We Prepare for an Earthquake?

• Make an earthquake preparedness kit!
• Food, water, matches, flashlight, batteries,
  blankets and SHOES! All will be very hard to come
  by following a large earthquake!

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What Should We do During an Earthquake?

• During shaking

After shaking has stopped, move outside AWAY from
structures.