EXAM 1 Flashcards
Greatest accumulation of matter
H and He
Lithosphere of Earth is
broken into plates
separated by
Divergence zones, Transform faults, Convergence zones
Earthquakes occur when…
Earth’s crust moves and we feel the vibrations
Dip-slip faults
they have the major amounts of their displacement in the
dip direction or vertical direction
Strike-slip faults
they have most of their displacement along the strike or
horizontal direction
Dip-slip faults are divided into…
normal and reverse
Normal fault
occurs when the hangingwall moves down relative to the
footwall. The dominant force is extensional
Reverse fault
occurs when the hangingwall moves upward relative to the
footwall. The dominant force is compressional
Strike-slip faults are also divided into…
Right-lateral (or dextral)
Left-lateral (or sinistral)
Right-lateral fault…
occurs when one fault block moves horizontally to the
right relative to the second block
Left-lateral fault…
occurs when one fault block moves horizontally to the
left relative to the second block
The point where the fault first ruptures is known as…
Hypocenter or focus
The point on the Earth’s surface directly above the hypocenter…
Epicenter
The study of earthquakes is known as…
Seismology
Instrument that detects the earth motions
Seismometer
