Lecture_04 - LECTURE 4 EARTHQUAKE DYNAMICS 1.0 FRACTURES...

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LECTURE 4 – EARTHQUAKE DYNAMICS 1.0 FRACTURES AND FAULTS CREEP VS. SEISMIC SLIP STRESS STRAIN ENERGY POINT OF ELASTIC REBOUND TYPE OF FAULTS C NORMAL (TENSIONAL)) C REVERSE (COMPRESSIONAL) C THRUST (LOW ANGLE COMPRESSIONAL) C SLIP-STRIKE (HORIZONTAL MOTION, SHEAR) 1.1 LOCATION OF RECENT EARTHQUAKES EPICENTER C RELATED TO PLATE BOUNDARIES MEXICO CITY - 1985 AFGHANISTAN -1988 CALIFORNIA - 1989 SITKA, ALASKA - 1973 FOCUS C DEEP FOCUS EARTHQUAKES (>60 MILES DEEP)
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RESTRICTED TO SUBDUCTION ZONES 1.2 SEISMIC WAVES P WAVES (BODY WAVE) C COMPRESSIONAL TYPE C VELOCITY - 4 TO 5 MILES /SEC C MOVES THROUGH SOLID AND LIQUID S WAVES (BODY WAVE) C SHEAR TYPE C VELOCITY - 2.3 to 2.7 MILES/SEC C MOVES ONLY THROUGH SOLIDS LOVE AND RAYLEIGH WAVES (SURFACE WAVES) C GENERALLY CAUSE THE MOST DAMAGE 1.3 LOCATING EPICENTER C SEISMOGRAPHS C SEISMOGRAMS C INTERSECTING RADII 1.4 RICHTER SCALE (1-10) MEASURED BY THE AMPLITUDE OF SEISMIC WAVE RECORDED EARTHQUAKE MAGNITUDE C MEASURE OF STRAIN ENERGY RELEASED LOGARITHMIC C ENERGY RELEASED INCREASES BY FACTOR OF 30
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This note was uploaded on 07/25/2008 for the course ISP 203A taught by Professor Larson during the Fall '08 term at Michigan State University.

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Lecture_04 - LECTURE 4 EARTHQUAKE DYNAMICS 1.0 FRACTURES...

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