quiz 1.what is seismology? 2.what is the name of the record produced by a seismometer? 3.t or f...
TRANSCRIPT
QUIZ 1. What is Seismology? 2. What is the name of the record produced by
a seismometer?3. T or F Seismic waves proves the EARTH’s
outer core is liquid.4. What is the name of the first wave generated
by an earthquake?BONUS 5. Name the point on Earth’s surface that is
directly above the focus of the earthquake.
ANSWERS 1.Seismology: is the scientific
study of earthquakes and the propagation of vibrations through Earth
2.Seismograms3.TRUE 4.P WAVE BONUS 1. EPICENTER
Magnitude
• Magnitude is the measurement of the energy released during an EQ • Measured on the Richter Scale
Intensity • Intensity is a measure of damage caused by an EQ
noted by observers during & after EQ
• Measured by the Modified Mercalli Scale
Locating an Epicenter• Three
seismograph stations are needed to locate the epicenter of an earthquake
• A circle where the radius equals the distance to the epicenter is drawn
• The intersection of the circles locates the epicenter
Time of an EQ
• The gap in arrival time between waves provides the info about the distance to the epicenter.
• Time of EQ occurrence is determined by the exact time of wave arrival at the seismic station and applying it to the travel time curve
Seismic Belts Locations of EQ correspond closely with tectonic
plate boundaries
• About 80% of all earthquakes occur in the circum-Pacific belt
• About 15% occur in the Mediterranean-Asiatic belt
• The remaining 5% occur in the interiors of plates and on spreading ridge centers
• More than 150,000 quakes strong enough to be felt are recorded each year