GEOL 240Lg 1st Edition Lecture 10 Outline of Last Lecture I. San Andreas Fault ContinuationII. In depth explanation of the earthquakeIII. San Haciento and Elsenor IV. Owens Valley EarthquakeV. Dead Valley VI. Eastern California Sheer Outline Current Lecture I. Seismic WavesII. Amplitude and Distance/TimeIII. Displacement Wave Length Amplitude IV. CyclesV. TsunamisCurrent Lecture- Seismic Waves: Tells us about what happened in an earthquake- Allows us to explore the interior of the earth.- Study them because they cause the “quaking” in an earthquake that causes1995 Japan Earthquake with damages and loses of lives.- High Frequency jittering then all hell breaks causing complete destruction.These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Terms: displacement: wave length amplitude - period: time period between successive wave crest - frequency: how many waves go by on a set amount of time (usually seconds for seismic waves)So, if period is 0.5 seconds then frequency is 1/0.5 = 2 cycles/seccycle= one wave crest to the next1 cycle/sec= 1 Hertz Alternative current M house is 60HZ.Velocity= V, v= fx → freq. X wave length → f= v/2 expressed in km/sec, can have different parameters tsunamis: Imp. Phenomenon, generated from earthquakes - regular wave= 10-15 secs 20 km/hr= 20,000/1hr = 400 cycles/hour◦ 6.7 waves/min = 10 sec period- wind causes waves, moon causes tides - won't notice tsunami wave out in the ocean- What is a tsunami?- Means harbor wave M Japanese- Frequently referred to as a tidal waves tells caused by vertical movements in the sea floor, +/-- usually earthquakes induced water and sliding or earthquakes- most big tsunamis are triggered by large subduction zones- thrust events 15-35m of thrust displacementsOcean waves are near surface features driven by wind, die off near the surface Massive: entire water column is involved, 5km wavelength of tsunami is 200km ( from crest to crest and 5 km thick)travels @800 km per hour!2011 Mw 9.0 Tohoku, Japan earthquake killed about 20,000 people-structural damage occur when tsunami recedes2004 MW 9.2 Sumatra, Indonesia. Generated enormous tsunami, killed 240, 000 people effected many in
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