What is the origin time of theearthquake according to each of the following stations? SSPA:WCI:WVT:3) At what time did the Love waves start to arrive at SSPA? Figure 11.5 Travel-time curves.A O15Time since the earthquake occurred (minutes)100010002000Surface-wave first arrivalsS-wave first arrivalP-wave first arrival300010002000Great-circle distance between the epicenterand the seismograph (kilometers)5Dashed rectangle is the area of thetravel-time graph B (right)B200Time since the earthquake occurred (seconds)15050400040001510GRAPHS OFSEISMIC WAVETRAVEL TIMEVS.DISTANCES-wave first arrivalS-timeP-wave first arrivál600800200 400Great-circle distance between the epicenterand the seismograph (kilometers)1000A. Travel-time curves for P-, S-, and surface waves with a set of traces from 17different seismographs at various distances from the epicenter of the magnitude-7.1 Ayutla-Puebla earthquake of September 19, 2017. The seismograms illustratehow the curves can be derived using empirical data. B. Travel-time curves for usewithin ~1000 km of an epicenter. This graph is used in Activity 11.3. Notice thatan S-minus-P time of 70 seconds corresponds to a distance to the epicenter ofapproximately 667 km.

The origin time is the actual time the earthquake occurred at the source. We need three parameters to calculate the origin time of an earthquake. Let's look at an example- I got to school at 10 am It took me 15 min to get there When did I leave house? 10 am -15 minutes= 9:45 am This would be the origin time of my trip For an earthquake we need difference in p and s wave arrival time or the distance of the station and time of earthquake to calculate the origin time of earthquake. Origin time of the earthquake at station SSPA: The difference in p and s wave arrival time = 43 sec. The p wave reaches the station at 17:51:45 ( from figure A11.3.1) If we plot the S-P time of 43 sec in the travel time curve it cuts the p wave curve at 60 seconds. So the earthquake occurred 60 seconds before the arrival of p waves in the station SSPA. The earthquake origin time is 17:50:45The difference in p and s wave arrival time = 76 sec. The p wave reaches the station at 17:52:38 ( from figure A11.3.1) If we plot the S-P time of 76 sec in the travel time curve it cuts the p wave curve in time seconds. So the earthquake occurred before 100 seconds of the arrival of p waves at the station So the earthquake origin time at WCI is 17:50:58The difference in p and s wave arrival time = 91 sec.The p wave reaches the station at 17:52:59 ( from figure A11.3.1)If we plot the S-P time of 91 sec in travel time curve it cuts the p wave curve at 127 seconds.So the earthquake occurred before 127 seconds of the arrival of p waves at the stationSo the earthquake origin time at WCI is 17:50:52Arrival time of love wave at SSPA 17:52:30. The origin time of the earthquake according to each of the following stationsThe earthquake origin time is 17:50:4 The earthquake origin time at WCI is 17:50:58The earthquake origin time at WCI is 17:50:5Arrival time of love wave atSSPA is 17:52:30

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What is the origin time of the earthquake according to each of the following stations? SSPA: WCI: WVT: 3) At what time did the Love waves start to arrive at SSPA?

Applications and Investigations in Earth Science (9th Edition)

9th Edition

ISBN:9780134746241

Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Chapter1: The Study Of Minerals

Section: Chapter Questions

Problem 1LR

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Question

What is the origin time of the
earthquake according to each of the following stations?
SSPA:
WCI:
WVT:
3) At what time did the Love waves start to arrive at SSPA?