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    NSF Funded CUNY GK-12 Science NOW Project

    Station

    Arrival Time of

    P-Wave

    Arrival Time of

    the S-Wave

    P-S Wave

    Interval

    Distance to the

    Epicenter

    P-Wave Travel

    Time

    Origin Time of

    Earthquake

    A 08:16:00 08:21:00 00:05:003.6 x103 km

    00:06:20 08:09:40

    B 08:19:00 08:26:00 00:07:00 5.0 x103 km 00:08:20 08:10:40

    C 08:21:00 08:30:00 00:09:00 7.6 x103 km 00:10:20 08:11:40

    UsingScrap

    Paper

    Menentukan pusat gempa dengan

    perbedaan waktu P dan S

    The Completed Process

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    Menentukan pusat gempa dengan perbedaan

    waktu P dan S

    NSF Funded CUNY GK-12 Science NOW Project

    Station

    Arrival Time of

    P-Wave

    Arrival Time of

    the S-Wave

    P-S Wave

    Interval

    Distance to the

    Epicenter

    P-Wave Travel

    Time

    Origin Time of

    Earthquake

    AB

    C

    Fill out the chart below using the three seismograms and the chart on Page 11 of the Earth Science Reference Tables.

    Start SimpleDraw a Line Down From the P-Wave to the Time Scale

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    Finding the Epicenter of an Earthquake

    Using the Difference in Time Between the P and the S Wave

    NSF Funded CUNY GK-12 Science NOW Project

    Station

    Arrival Time of

    P-Wave

    Arrival Time of

    the S-Wave

    P-S Wave

    Interval

    Distance to the

    Epicenter

    P-Wave Travel

    Time

    Origin Time of

    Earthquake

    AB

    C

    Fill out the chart below using the three seismograms and the chart on Page 11 of the Earth Science Reference Tables.

    Judge what time the P-wave starts

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    Finding the Epicenter of an Earthquake

    Using the Difference in Time Between the P and the S Wave

    NSF Funded CUNY GK-12 Science NOW Project

    Station

    Arrival Time of

    P-Wave

    Arrival Time of

    the S-Wave

    P-S Wave

    Interval

    Distance to the

    Epicenter

    P-Wave Travel

    Time

    Origin Time of

    Earthquake

    AB

    C

    Fill out the chart below using the three seismograms and the chart on Page 11 of the Earth Science Reference Tables.

    08:16 17 18 19

    A Quarter after 8 OClock! And No Seconds!

    A zoom-in shows P-wave starting at approximately 08:16:00

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    Finding the Epicenter of an Earthquake

    Using the Difference in Time Between the P and the S Wave

    NSF Funded CUNY GK-12 Science NOW Project

    Station

    Arrival Time of

    P-Wave

    Arrival Time of

    the S-Wave

    P-S Wave

    Interval

    Distance to the

    Epicenter

    P-Wave Travel

    Time

    Origin Time of

    Earthquake

    A 08:16:00B

    C

    Fill out the chart below using the three seismograms and the chart on Page 11 of the Earth Science Reference Tables.

    Put that value in the appropriate box

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    Finding the Epicenter of an Earthquake

    Using the Difference in Time Between the P and the S Wave

    NSF Funded CUNY GK-12 Science NOW Project

    Station

    Arrival Time of

    P-Wave

    Arrival Time of

    the S-Wave

    P-S Wave

    Interval

    Distance to the

    Epicenter

    P-Wave Travel

    Time

    Origin Time of

    Earthquake

    A 08:16:00 08:21:00B

    C

    Fill out the chart below using the three seismograms and the chart on Page 11 of the Earth Science Reference Tables.

    Repeat the same process for the S-wave.

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    Finding the Epicenter of an Earthquake

    Using the Difference in Time Between the P and the S Wave

    NSF Funded CUNY GK-12 Science NOW Project

    Station

    Arrival Time of

    P-Wave

    Arrival Time of

    the S-Wave

    P-S Wave

    Interval

    Distance to the

    Epicenter

    P-Wave Travel

    Time

    Origin Time of

    Earthquake

    A08:16:00 08:21:00

    B

    C

    Fill out the chart below using the three seismograms and the chart on Page 11 of the Earth Science Reference Tables.

    08:21:00 (S-Wave Time)

    -08:16:00 (P-Wave Time)

    Calculate the interval between the two wave arrivals at the seisomgraph

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    Finding the Epicenter of an Earthquake

    Using the Difference in Time Between the P and the S Wave

    NSF Funded CUNY GK-12 Science NOW Project

    Station

    Arrival Time of

    P-Wave

    Arrival Time of

    the S-Wave

    P-S Wave

    Interval

    Distance to the

    Epicenter

    P-Wave Travel

    Time

    Origin Time of

    Earthquake

    A08:16:00 08:21:00 00:05:00

    B

    C

    Fill out the chart below using the three seismograms and the chart on Page 11 of the Earth Science Reference Tables.

    08:21:00 (S-Wave Time)

    -08:16:00 (P-Wave Time)

    00:05:00 (Time Difference)( 0 Hours, 5 Minutes, 0 Seconds )

    Enter that time in the appropriate box

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    NSF Funded CUNY GK-12 Science NOW Project

    Station

    Arrival Time of

    P-Wave

    Arrival Time of

    the S-Wave

    P-S Wave

    Interval

    Distance to the

    Epicenter

    P-Wave Travel

    Time

    Origin Time of

    Earthquake

    A08:16:00 08:21:00 00:05:00

    B

    C

    Go to page 11 of your Earth Science Reference Tables for the chart shown above

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    NSF Funded CUNY GK-12 Science NOW Project

    Station

    Arrival Time of

    P-Wave

    Arrival Time of

    the S-Wave

    P-S Wave

    Interval

    Distance to the

    Epicenter

    P-Wave Travel

    Time

    Origin Time of

    Earthquake

    A08:16:00 08:21:00 00:05:00

    B

    C

    Use the P-S Wave time interval to figure out the distance to the epicenter

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    NSF Funded CUNY GK-12 Science NOW Project

    Station

    Arrival Time of

    P-Wave

    Arrival Time of

    the S-Wave

    P-S Wave

    Interval

    Distance to the

    Epicenter

    P-Wave Travel

    Time

    Origin Time of

    Earthquake

    A08:16:00 08:21:00 00:05:00

    B

    C

    Scrap Paper

    Place Marks at

    P-S Wave Interval

    Time and at 0.

    Create a reference measurement using scrap paper and the P-S Wave value

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    NSF Funded CUNY GK-12 Science NOW Project

    Station

    Arrival Time of

    P-Wave

    Arrival Time of

    the S-Wave

    P-S Wave

    Interval

    Distance to the

    Epicenter

    P-Wave Travel

    Time

    Origin Time of

    Earthquake

    A08:16:00 08:21:00 00:05:00

    B

    C

    Scrap Paper

    Scrap Paper

    Slide paper up

    and over until the

    reference marksLine up with the

    P and S Lines.

    Find the proper place where the reference marks match the P and S Lines.

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    NSF Funded CUNY GK-12 Science NOW Project

    Station

    Arrival Time of

    P-Wave

    Arrival Time of

    the S-Wave

    P-S Wave

    Interval

    Distance to the

    Epicenter

    P-Wave Travel

    Time

    Origin Time of

    Earthquake

    A08:16:00 08:21:00 00:05:00

    B

    C

    Scrap Paper

    Lightly, make a

    reference mark in pencil

    on the reference table

    at this place on the P line.

    For convenience, make a light pencil mark on the P line for use in the next step

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    NSF Funded CUNY GK-12 Science NOW Project

    Station

    Arrival Time of

    P-Wave

    Arrival Time of

    the S-Wave

    P-S Wave

    Interval

    Distance to the

    Epicenter

    P-Wave Travel

    Time

    Origin Time of

    Earthquake

    A08:16:00 08:21:00 00:05:00

    B

    C

    Look straight down from the P line pencil mark and judge the epicenter distance.

    .2 . 4 .6 .8

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    NSF Funded CUNY GK-12 Science NOW Project

    Station

    Arrival Time of

    P-Wave

    Arrival Time of

    the S-Wave

    P-S Wave

    Interval

    Distance to the

    Epicenter

    P-Wave Travel

    Time

    Origin Time of

    Earthquake

    A08:16:00 08:21:00 00:05:00 3.6 x103 km

    B

    C

    Lightly, make

    reference marks in pencil

    On the reference table

    at these two places .

    Enter that value for the epicenter distance with proper units.

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    NSF Funded CUNY GK-12 Science NOW Project

    Station

    Arrival Time of

    P-Wave

    Arrival Time of

    the S-Wave

    P-S Wave

    Interval

    Distance to the

    Epicenter

    P-Wave Travel

    Time

    Origin Time of

    Earthquake

    A 08:16:00 08:21:00 00:05:00 3.6 x103 km

    B

    C

    Look across at the y-axis to Judge the time value

    00:06:40

    00:06:20

    TravelTime(minutes)

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    NSF Funded CUNY GK-12 Science NOW Project

    Station

    Arrival Time of

    P-Wave

    Arrival Time of

    the S-Wave

    P-S Wave

    Interval

    Distance to the

    Epicenter