Analyze the Data A) Using the data in the fourth column of Table 1 calculate the RECURRENCE INTERVAL (RE) (average number of years) between major ruptures of the Mojave Section of the San Andreas fault at Pallett Creek. (Ignore the first and last values in the column when making this calculation - you should have 9 values to calculate RE) B) According to this time between earthquakes (i.e, the recurrence interval), is the Mojave section of the San Andreas fault at Pallett Creek due, not yet due, or well overdue, for a major rupture? (compare your average to the last time it ruptured). C) Look at Table 1 - note the difference between the shortest interval and the longest. • How much greater than your RE is the longest interval between events? • How much smaller is the shortest interval? • Does this give you more or less confidence about your answer to question 2?
Analyze the Data A) Using the data in the fourth column of Table 1 calculate the RECURRENCE INTERVAL (RE) (average number of years) between major ruptures of the Mojave Section of the San Andreas fault at Pallett Creek. (Ignore the first and last values in the column when making this calculation - you should have 9 values to calculate RE) B) According to this time between earthquakes (i.e, the recurrence interval), is the Mojave section of the San Andreas fault at Pallett Creek due, not yet due, or well overdue, for a major rupture? (compare your average to the last time it ruptured). C) Look at Table 1 - note the difference between the shortest interval and the longest. • How much greater than your RE is the longest interval between events? • How much smaller is the shortest interval? • Does this give you more or less confidence about your answer to question 2?
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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Transcribed Image Text:Recurrence history, San Andreas fault, Mojave section
It is well known that faults don't rupture everywhere at the same time. The San Andreas fault, while
a long "continuous" fault, has a varied rupture history.
Studies at Pallett Creek (shown in the map below) and other locations along the Mojave section of
the San Andreas fault have revealed a rough chronology for that section of the fault over the last
1,500 years -- much longer than covered by historic records of the region. These geologic studies are
the basis for our estimate of earthquake risk in this area from this fault segment.
D18
| 117°
ТЕНАСНАPI MTS
Garlock Fault
100 km
MOJAVE DESERT
San Andreas Fault
PC
SAN GABRIEL MOUNTAINS
WRIGHTWOOD
SAN BERNARDINO
MOUNTAINS
San Jacinto Fault
34
Los Angeles
SAN JĂCINTO MTS
PACIFIC OCEAN
Examine the Earthquake Data
Table 1. Previous San Andreas fault EQ ruptures at Pallett Creek
(Mojave section)
(Probable) Date of
Years Until Next
EQ
"Name"
EQ Date Range
EQ
Event
January 9, 1857
greater than 162
January 9, 1857
December 8, 1812
1465 - 1495 A.D.
1329 - 1363 A.D.
K
44.08
December 8, 1812
1480 A.D.
332
1346 A.D.
134
H.
1100 A.D.
246
1035 - 1165 A.D.
1015 - 1081 A.D.
981 - 1013 A.D.
775 - 819 A.D.
721 - 747 A.D.
658 - 684 A.D.
G
F
1048 A.D.
52
997 A.D.
52
E
797 A.D.
200
734 A.D.
63
671 A.D.
63
В
before 529 A.D.
greater than 142
A
??? - 529 A.D.
Table data from: Sieh, K., Stuiver, M. and Brillinger, D. (1989). A More Precise
SALTON
SEA
Elsinore Fault
Transcribed Image Text:Analyze the Data
A) Using the data in the fourth column of Table 1 calculate the RECURRENCE INTERVAL (RE)
(average number of years) between major ruptures of the Mojave Section of the San Andreas fault at
Pallett Creek. (Ignore the first and last values in the column when making this calculation - you should
have 9 values to calculate RE)
B) According to this time between earthquakes (i.e, the recurrence interval), is the Mojave section of
the San Andreas fault at Pallett Creek due, not yet due, or well overdue, for a major rupture?
(compare your average to the last time it ruptured).
C) Look at Table 1 - note the difference between the shortest interval and the longest.
• How much greater than your RE is the longest interval between events?
• How much smaller is the shortest interval?
• Does this give you more or less confidence about your answer to question 2?
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