HELP PLEASE 100 POINTS!!!!!! 11 QUESTIONS
1) From the seismograms in Figure B, what is the time lag between the arrival of the Pwaves and the arrival of the S-waves at the Manila seismograph station? (1 point)
(a) 2 minutes
(b) 2 minutes & 30 seconds
(c) 3 minutes
(d) 3 minutes & 30 seconds
(e) 4 minutes
(f) 4 minutes and 30 seconds
2) From the seismograms in Figure B, what is the time lag between the arrival of the Pwaves and arrival of the S-waves at the Dili seismograph station? (1 point)
(a) 2 minutes
(b) 2 minutes & 30 seconds
(c) 3 minutes
(d) 3 minutes & 30 seconds
(e) 4 minutes
(f) 4 minutes and 30 seconds
3) From the seismograms in Figure B, what is the time lag between the arrival of the Pwaves and arrival of the S-waves at the Jakarta seismograph? (1 point)
(a) 1 minute
(b) 1 minute & 50 seconds
(c) 2 minutes & 30 seconds
(d) 3 minutes & 20 seconds
(e) 4 minutes
(f) 5 minutes
4) On the basis of these travel times, which seismograph station was closest to the
earthquake epicenter? (2 points)
(a) Jakarta, Indonesia
(b) Dili, Timor
(c) Manila, Philippines
(d) There is not enough information given to assess the relative distances.
(e) They were all the same distance from the epicenter
5) From the P-S arrival lag times answered in questions (1) through (3) and the P- & Swave travel time graph of Figure C, what is the approximate distance between the
Manila station and the epicenter of the earthquake? (1 point)
(a) 1000 km
(b) 1500 km
(c) 1800 km
(d) 2500 km
(e) 3200 km
6) From the P-S arrival lag times answered in questions (1) through (3) and the P- & Swave travel time graph of Figure C, what is the approximate distance between the Dili
station and the epicenter of the earthquake? (1 point)
(a) 1900 km
(b) 2900 km
(c) 3800 km
(d) 4600 km
(e) 5300 km
7) From the P-S arrival lag times answered in questions (1) through (3) and the P- & Swave travel time graph of Figure C, what is the approximate distance between the
Jakarta station and the epicenter of the earthquake? (1 point)
(a) 500 km
(b) 1200 km
(c) 1800 km
(d) 2500 km
(e) 3200 km
8) On the basis of the information provided in the previous answers, use a circledrawing compass and the map in Figure A to determine which of the following cities is
closest to the epicenter of the earthquake. (3 points)
(a) Jayapura, New Guinea
(b) Bandar Seri Begawan, Borneo
(c) Kuala Lumpur, Malaysia
(d) Jakarta, Indonesia
(e) Bankok, Thailand
(f) Hanoi, Vietnam
(g) Taipei, Taiwan
(h) Wuhan, China
(i) Ngerulmud, Palau
9) From the information in the previous questions determine the approximate time at
which the earthquake actually occurred. Note: You were not told explicitly how to do
this, but you can easily figure it out because you know from Figure C how long it takes
seismic waves to travel any specified distance. (Extra Credit 1 point)
(a) 6:00:00
(b) 6:01:00
(c) 6:02:00
(d) 6:03:00
(e) 6:04:30
(f) 6:05:00
(g) 6:06:20
(h) 6:08:00
10) A seismometer located 20 km from the epicenter of an earthquake records a
maximum amplitude seismic wave of ~5-6 mm. Use Figure D to determine the Richter
magnitude of the earthquake. Refer to lecture and/or your textbook for discussion.
(2 points)
(a) 2.5
(b) 3.0
(c) 3.5
(d) 4.0
(e) 4.5
(f) 5.0
(g) 6.5
11) Using Figure D, determine the approximate amplitude of the seismic wave that
would be recorded at a seismograph station located 200 km from the same earthquake
in question (10). Refer to Figure 8.11b in your textbook. (1 point)
(a) less than 1 mm
(b) ~5 mm
(c) ~10 mm
(d) ~20 mm
(e) ~40 mm
(f) ~80 mm
