51 tohoku earthquake megathrust earthquake a what is

51. Tohoku earthquake (megathrust earthquake)
a. What is a megathrust earthquake)
b. Subduction zones
52. Tsunami early warning systems
a. What is it
53. Earthquakes and seismic waves
a. Identify focus, epicenter, fault scarp
54. Elastic rebound theory
a. Explain earthquake rupture mechanism
55. 3 types of seismic waves

a. P waves
b. S waves
c. Surface waves
d. Velocities (which arrive faster)
e. Characteristics (movements of materials)
56. Locating earthquakes
a. Seismographs used to located p and s waves
57. Earthquake magnitude
a. 3 different types
58. Direction of fault motion
a. Look at chart
59. Where do earthquakes occur
a. Ring of fire
b. Plate tectonic settings
60. Seismicity and plate boundaries
a. Look at picture
61. Tsunami waves
a. How they can become so large
b. Relative speed of tsunami waves compared to p and s waves
62. Earthquake prediction
a. Can’t predict just yet
b. Frequency of earthquakes
63. Structure of earth
a. Physical and chemical characteristics of each layer
64. Information gathered from meteorites, upper mantle, and lab experiments
65. Seismic wave velocities
a. Density, temperature, composition
66. Seismic wave reflection and refraction
67. P wave path through interior
68. S wave path through interior 69. Velocity profiles of earth's interior
70. Earth has iron core
71. Earth’s internal temperature
a. Conduction
b. Convection
c. Radiative
72. Geotherm of earth’s interior

b. Effect at surface
73. Earth’s magnetic fields
a. Power geodynamo fields
74. Magnetic reversals
a. What are frequencies
75. 3D imaging of earth’s interior
76.