GEOG 1114 Physical Geography - Oklahoma State University. Locating the epicenter of an earthquake using trilateration _ Identifying volcanic hazards during a simulated eruption

GEOG 1114 Physical Geography - Oklahoma State University. Locating the epicenter of an earthquake using trilateration Now, you will learn how data from seismographs in different locations are used to pinpoint the epicenter of an earthquake via trilateration. The material you need to refer to for this activity is in the file "Epicenter exercise package" on Canvas. The file has the seismograms for three locations (Marlow, OK, Carrier, OK, and Bolivar, MO), a scale with the P-S waves curve, and a map with the location of the three localities. Screenshot at 7.23.03 PM.png Screenshot at 7.23.11 PM.png Image transcription text Seismogram Begin Time: :17:21 GMT Station: X34A - Smith Ranch, Marlow, OK, USA Station Location: Latitude 34.60 N, Longitude 97.83 W S P Time (s) 00 5.00 10.00 15.00 20.00 25.00 30.00 35.00 40.00 45.00 50.00 1 4E-05- 2E-05- Amplitude 0EO0- 2E-05- 4E-05- Amplitude 2E-05- Amplitude OEOO- 2E-05- 4E-05- TTT TTT TITT TITT TTTTTT 00 5.00 10.00 15.00 20.00 25.00 30.00 35.00 40.00 45.00 50.00 Time (s) Data retrieved from the United States Geologic Survey. Screenshot at 7.23.16 PM.png Image transcription text Seismogram Begin Time: :17:02 GMT Station: CROK - Carrier, Oklahoma Station Location: Latitude 36.50 N, Longitude 97.98 W Prime (sS 00 3.00 6.00 9.00 12.00 15.00 18..00 27.00 30.00 33.00 36.01 1E-03- OE00- 1E-03- Amplitude Amplitude 2E-03 1E-03- DEOO- 1E-03- 26 03 Amplitude SECOR 1E-03- OE00- 1E-03- TTTT TTT 00 3.00 6.00 9.00 12.00 15.10 18..00 27.00 30.00 33.00 36.01 Time (s) Data retrieved from the United States Geologic Survey. Screenshot at 7.23.21 PM.png Image transcription text Seismogram Begin Time: :17:41 GMT Station: $39B - Bolivar, MO, USA Station Location: Latitude 37.69 N, Longitude 93.32 w Time (s) 60 70 80 Amplitude Amplitude Amplitude 60 70 80 Time (s) Data retrieved from the United States Geologic Survey. Screenshot at 7.23.34 PM.png Image transcription text Seismic Wave Arrival Time Chart 90 80 h U1 Ch l D O O 0 Time (seconds) Lu 0 Example: 20 seconds 800 200 km Distance (kilometers) Note that unlike the chart in the movie, this one already has the S-P curve. 4.8 First, fill in the table below with the required data. (3 pts) Station P-wave arrival time (seconds) S-wave arrival time (seconds) P- minus s- waves arrival times (seconds) Distance to epicenter from station (kilometers) Marlow, OK 240 Carrier, OK 60 Bolivar, MO 430 Identifying volcanic hazards during a simulated eruption Volcán Pacaya (Fig. 4.1) is in the same part of Guatemala as Volcán Atitlán (mentioned in Part 1). This said, the eruptions of the two volcanoes tend to be similar. Volcán Pacaya is a composite volcano, so in case of eruption, you may expect high explosivity. Now, we will simulate an eruption for an exercise. The simulated event has a VEI of 4. The calculation of the VEI and the dominant winds indicate the area affected by ash fall will be about 10 km towards the northeast of the volcano. The time of the eruption is during the wet season. Lavas will only cover areas to the south of the peak as far as 4 km. However, pyroclastic flows will develop due to rains. Such flows and possibly lahars should flow down along the main valleys reaching distances as far as 7 km from the volcano. Figure 4.1 Volcán Pacaya (Guatemala) and its surroundings. 4.10 Now, identify on the map the three towns around the volcano: Santa Elena Barillas, San Vicente Pacaya, and Palin. Now, based on the information above, you will assess the types of volcanic hazard for each of the towns. In the table below, mark with an "x" if the village is threatened by each of the three volcanic hazards. (2 pts) Village Pyroclastic flow Lava flow Downwind ashfall Santa Elena Barillas San Vicente Pacaya Palin Earth Science Science Geography GEOG 1114