The distance and other infomation can google it, just need to have an estimate n
ID: 286173 • Letter: T
Question
The distance and other infomation can google it, just need to have an estimate number!
3. Earthquake warning system A typical earthquake produces two types of seismic waves. P ("primary") seismic waves are longitudinal waves that move through the earth's upper crust with speed 3 to 5 km/s (the exact speed depends on the local composition of the earth's crust). S (secondary") waves are transverse waves that move slower. The S-wave speed is typically about 60% of the P-wave speed in any given material. The map below shows the Cascadia subduction zone (white line) just off the coast of Oregon. In the next 50 years, there is a 30% chance that a very large earthquake will occur with an epicenter on this white line.Explanation / Answer
Corvalis is about fifty miles inland and cascadia subduction zone distance is approximately 60 miles hence we have a total distance of 110 miles between cascadia subduction zone and Corvalis.
Therefore distance = 110 mile = 177.028 km
Speed of P wave = 3 km/sec to 5 km/sec
Time of P wave from cascadia subduction zone and Corvalis = 177.028/3 to 177.028/5
Time of P wave from cascadia subduction zone and Corvalis = 59.009 seconds to 35.405 seconds
Speed of S wave = 0.6 x 5 - 0.6 x 3
Speed of S wave = 3 km/sec - 1.8 km/sec
Time of S wave from cascadia subduction zone and Corvalis = 177.028/1.8 to 177.028/3
Time of S wave from cascadia subduction zone and Corvalis = 98.348 seconds to 59.009 seconds
This means we have 1 minute to 1 and a half minute to relocate ourselves.
b) Newport and corvallis distance is 49 miles that is 78.8579 kilometers
Speed of S wave = 3 km/sec - 1.8 km/sec
Time of S wave fromnewport and Corvalis = 78.8579/1.8 to 78.8579/3
Time of S wave from cascadia subduction zone and Corvalis = 43.809 seconds to 26.2859 seconds
Therefore, time delay betweeen trigerring and arrival of S wave is from 43.809 seconds to 26.2859 seconds
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.