EarthSci 4 - Earthquake
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Transcript of EarthSci 4 - Earthquake
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Focus, Epicenter, and Fault
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Elastic Rebound Hypothesis
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Elastic Rebound Hypothesis
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Seismograph
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Seismogram
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Seismic Waves Paths Through the Earth
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Measuring Earthquakes
P Waves
- Have the greatest velocity of all earthquake waves
- Are push-pull waves that push (compress) and pull (expand) in the direction that the waves travel
- Travel through solids, liquids, and gases
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Measuring Earthquakes
S Waves- Seismic waves that travel along Earth’s outer layer
- Slower velocity than P waves
- Shake particles at right angles to the direction that they travel
- Travel only through solids
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Earth’s Interior Showing P and S Wave Paths
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Locating an Earthquake
Measuring Earthquakes
Earthquake Distance
• Travel-time graphs from three or more seismographs can be used to find the exact
location of an earthquake epicenter.
• The epicenter is located using the difference in the arrival times between P and S wave recordings, which are related to distance.
• About 95 percent of the major earthquakes occur in a few narrow zones.
Earthquake Direction
Earthquake Zones
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Locating an Earthquake
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Pusan Seismic Station S-P Interval = seconds
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Tokyo Seismic Station S-P Interval = seconds
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Akita Seismic Station S-P Interval = seconds
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Station S-P Interval Epicentral Distance
Pusan 60 seconds KM
Tokyo 50 seconds KM
Akita 70 seconds KM
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RECORDING STATION
S-P INTERVAL
EPICENTER DISTANCE
PUSAN 56 sec 549 km
TOKYO 44 sec 434 km
AIKITA 71 sec 697 km
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Location You Found Actual Location
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Measuring Earthquakes
Richter Scale
• Does not estimate adequately the size of very large earthquakes
• Based on the amplitude of the largest seismic wave
• Each unit of Richter magnitude equates to roughly a 32-fold energy increase
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Measuring Earthquakes
Modified Mercalli• scales measures how people feel and
react to the shaking of an earthquake. • It is a relative scale, because people
experience different amounts of shaking in different places.
• It is based on a series of key responses such as people awakening, the movement of furniture, and damage to structures.
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Earthquake Magnitudes
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Seismic Vibrations
Destruction from Earthquakes
Liquefaction• Saturated material turns fluid
• Underground objects may float to surface
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Tsunami
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Tsunami
Cause of Tsunamis• A tsunami triggered by an earthquake
occurs where a slab of the ocean floor is displaced vertically along a fault.
• A tsunami also can occur when the vibration of a quake sets an underwater landslide into motion.
• Tsunami is the Japanese word for “seismic sea wave.”
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Destruction from Earthquakes
• With many earthquakes, the greatest damage to structures is from landslides and ground subsidence, or the sinking of the ground triggered by vibrations.
Landslides
• In the San Francisco earthquake of 1906, most of the destruction was caused by fires that started when gas and electrical lines were cut.
Fire
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Predicting Earthquakes
• So far, methods for short-range predictions of earthquakes have not been successful.
Short-Range Predictions
• Scientists don’t yet understand enough about how and where earthquakes will occur to make accurate long-term predictions.
Long-Range Forecasts
• A seismic gap is an area along a fault where there has not been any earthquake activity for a long period of time.
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