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The S&P 500 index does not have a specific opening time, as it is not a physical entity that opens and closes like a stock exchange. It is a benchmark index that represents the performance of a selection of large-cap stocks. Trading of stocks that make up the S&P 500 typically begins when the Stock Market opens at 9:30 AM Eastern Time in the U.S.

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1y ago

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How does distance from the epicenter affect the s-p waves time interval?

The distance from the epicenter affects the S-P wave time interval because seismic waves travel at different speeds. P-waves (primary waves) are faster than S-waves (secondary waves), so as the distance from the epicenter increases, the time gap between the arrival of the P-wave and S-wave (the S-P time interval) also increases. This time interval is used to calculate the distance to the earthquake's epicenter, allowing seismologists to locate it accurately. Thus, a greater distance results in a longer S-P time interval.


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How do you determine an p-s interval on a seismogram?

To determine the P-S interval on a seismogram, first identify the arrival times of the P-waves and S-waves. The P-wave is the first seismic wave to arrive, so locate its initial peak on the seismogram. Next, find the point where the S-wave arrives, which is characterized by a distinct increase in amplitude following the P-wave. The time difference between the two arrivals, known as the P-S interval, can then be calculated by subtracting the P-wave arrival time from the S-wave arrival time.


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