UNIVERSE
PLANETARY INTERIORS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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2:05 pm
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2:11 pm
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2:14 pm
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2:36 pm
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Detailed explanation-1: -A seismic P-wave is recorded at 2:25 p.m at a seismic station located 7600 kilometers from the epicenter of an earthquake. At what time did the earthquake occur? 2:05 p.m.
Detailed explanation-2: -If you want to determine the “Origin Time” (actual time the earthquake occurred at the source), take the s-p times above and multiply by 1.37. Take this time and subtract that from the P arrival time to get the approximate origin time.
Detailed explanation-3: -For example, this graph tells you that if an earthquake epicenter is 4000 km away, the P-wave will take 7 minutes to get to you. That is, at your location you will feel the first vi-brations 7 minutes after the rupture occurs at the epicenter.
Detailed explanation-4: -A seismic P-wave is recorded at 2:25 p.m. at a seismic station located 7600 kilometers from the epicenter of an earthquake.