GEOL 240Lg 1st Edition Lecture 10 Outline of Last Lecture I San Andreas Fault Continuation II In depth explanation of the earthquake III San Haciento and Elsenor IV Owens Valley Earthquake V Dead Valley VI Eastern California Sheer Outline Current Lecture I Seismic Waves II Amplitude and Distance Time III Displacement Wave Length Amplitude IV Cycles V Tsunamis Current 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 sec cycle one wave crest to the next 1 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 displacements Ocean 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 recedes 2004 MW 9 2 Sumatra Indonesia Generated enormous tsunami killed 240 000 people effected many in Thailand
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