Use the formula for the conservative value of PGA to determine the equivalent UBC and IBC value

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
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Answer c

29. The recent earthquake in Abra had a magnitude of
M7.0 recorded on a Wood Anderson seismometer at a
standard Richter station. Describe the expected damage
in Baguio City located 143 miles from the earthquake
epicenter.
a. Determine the recorded amplitude
b.
Determine the equivalent Modified Mercalli
Scale
Use the formula for the conservative value of
PGA to determine the equivalent UBC and IBC
value
Hint: PGAdesign = 0.1 x 10 -1.95 + 0.32 MM
C.
TABLE 2-1
APPROXIMATE RELATIONSHIPS BETWEEN PGA, MM, UBC
ZONING, AND IBC ZONING CRITERION
MM
IV
V
VI
VII
VIII
IX
X
XI
XII
PGA (g)
<0.03
0.03-0.08
0.08-0.15
0.15-0.25
0.25-0.45
045-060
0.60-0.80
0.80 -0.90
> 0.9
UBC
zone (Z)
1
2
3
4
IBC
Mapped spectral
acceleration at
short period (S₁)
around 30
around 75
around 115
around 150
Transcribed Image Text:29. The recent earthquake in Abra had a magnitude of M7.0 recorded on a Wood Anderson seismometer at a standard Richter station. Describe the expected damage in Baguio City located 143 miles from the earthquake epicenter. a. Determine the recorded amplitude b. Determine the equivalent Modified Mercalli Scale Use the formula for the conservative value of PGA to determine the equivalent UBC and IBC value Hint: PGAdesign = 0.1 x 10 -1.95 + 0.32 MM C. TABLE 2-1 APPROXIMATE RELATIONSHIPS BETWEEN PGA, MM, UBC ZONING, AND IBC ZONING CRITERION MM IV V VI VII VIII IX X XI XII PGA (g) <0.03 0.03-0.08 0.08-0.15 0.15-0.25 0.25-0.45 045-060 0.60-0.80 0.80 -0.90 > 0.9 UBC zone (Z) 1 2 3 4 IBC Mapped spectral acceleration at short period (S₁) around 30 around 75 around 115 around 150
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