Seismic Hazards
- Created by: hollyjxne
- Created on: 13-05-18 18:16
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- Seismic Hazards
- Earthquakes are the primary hazard of seismic activity
- Tension created at plate boundaries, when plates jerk past each other vibrations are sent out
- shockwaves (vibrations) are spread out from the focus.
- The epicenter is the point on earths surface where earthquake is first felt.
- ground shakes and sometimes ruptures
- shockwaves (vibrations) are spread out from the focus.
- Measuring the scale of an earthquake
- Mercalli Scale
- Measures impacts using observations, scale of 1-12
- Richter Scale
- measures magnitude and is logarithmic
- Moment Magnitude Scale
- Based on total amount of energy released and is logarithmic
- Mercalli Scale
- Tsunamis
- Large waves caused by the displacement of a large volume of water
- Triggered by underwater earthquakes, whereby the seabed moves
- More poreful when closer to the coast
- Large waves caused by the displacement of a large volume of water
- Soil liquefication
- Soil is over saturated with water and so the vibrations cause it to act like water
- Soil is made weak and is easier to deform so more likely to subside
- Soil is over saturated with water and so the vibrations cause it to act like water
- Tension created at plate boundaries, when plates jerk past each other vibrations are sent out
- Tsunamis
- Large waves caused by the displacement of a large volume of water
- Triggered by underwater earthquakes, whereby the seabed moves
- More poreful when closer to the coast
- Large waves caused by the displacement of a large volume of water
- Landslides and avalanches
- Earthquakes are the primary hazard of seismic activity
- Tension created at plate boundaries, when plates jerk past each other vibrations are sent out
- shockwaves (vibrations) are spread out from the focus.
- The epicenter is the point on earths surface where earthquake is first felt.
- ground shakes and sometimes ruptures
- shockwaves (vibrations) are spread out from the focus.
- Measuring the scale of an earthquake
- Mercalli Scale
- Measures impacts using observations, scale of 1-12
- Richter Scale
- measures magnitude and is logarithmic
- Moment Magnitude Scale
- Based on total amount of energy released and is logarithmic
- Mercalli Scale
- Soil liquefication
- Soil is over saturated with water and so the vibrations cause it to act like water
- Soil is made weak and is easier to deform so more likely to subside
- Soil is over saturated with water and so the vibrations cause it to act like water
- Tension created at plate boundaries, when plates jerk past each other vibrations are sent out
- Shaking causes rocks and soils to dislodge and cause landslides
- Earthquakes are the primary hazard of seismic activity
- Location of seismic hazards
- Margin type
- Biggest /highest magnitude earthquakes @ destructive margins
- Depth of focus
- Deep focus = higher magnitude but less damage as shockwaves have further to travel
- Margin type
- Earthquakes are the primary hazard of seismic activity
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