View
218
Download
0
Category
Preview:
Citation preview
Earthquake-Induced Landslides1970 Yungay Peru, MW 7.9
1958 Lituya Bay, Alaska, MW 7.8
Lloyd S. CluffEarthquake Risk Management
Geosciences DepartmentPacific Gas and Electric
San Francisco
International Conference in Commemoration of the
10th Anniversary if the Chi-Chi EarthquakeSeptember 21 – 26, 2009
National Central University, Taiwan
Peru Earthquake 31 May 1970 MW 7.9
Nevado Huascran (elevation 6,400 m ) View Northeast from Huaraz
Yungay, Peru 1969, Before 1970 Earthquake, Pico Huascaran Elevation 6,768 m (22, 307 ft.) in Background
L. Cluff Photo
Yungay After Debris Avalanche Devastation
L. Cluff Photo 1970
Debris Avalanche Impact on Yungay
Cemetery hill
North Peak of Huascran Telephoto View of Debris Avalanche Source
Massive Granite Blocks From Pico HuascaranIn Yungay
Ranrahirca
Below Ranrahirca Near Rio Santa Valley
L. Cluff Photo 1970
Rio Santa Valley Floodplain Before Earthquake
L. Cluff Photo 1970
Rio Santa Valley Floodplain After Earthquake
Rio Santa Valley Floodplain Devastated ~160 Kmto Pacific Ocean Near Chimbote
L. Cluff Photo 1970
Diversion Dam Reported Destroyed (1970), However, Dam Was Undamaged
L. Cluff 1983
Yungay 1983 Rebuilding
L. Cluff Photo 1983
L Cluff 1988
View from Cemetery Hill, Yungay as it appeared in 1988
Plaza de ArmasNew construction
Nevado Huascaran
L Cluff 1988
1988 - Telephoto View East from Cemetery Hill
Plaza de Armas
Yungay 1983 Rebuilding
L. Cluff 1983
Yungay 1983 Rebuilding
L. Cluff 1983
Rio Santa Gorge View South
Proposed concreteDam 1983
Casma Before EQ
Casma After EQ
Shaking Performance of Unreinforced Masonry - Huaraz
L. Cluff Photo 1970
Huaraz School Survives Shaking Damage
L. Cluff Photo 1970
19587.81964
9.3
1958 Lituya Bay Fairweather Fault Earthquake Mw 7.8
L. Cluff Photo 1964
Fairweather Fault, View North 1958 MW 7.8
Looking North Along Strike of Fairweather Fault at Lituya Bay
524 m (1,720 ft.)
1958 Wave Trimline
1958 Tsunami Trimeline and Older Trimelines
M
K
H 1936 wave
J 1874 wave
1853 wave
Moraine ~ 1,000 years
Tree trimelines based on growth ring datingAverage recurrence ~ 26 years (elapsed time since 1958 = 51 yrs)
Lituya Bay, Alaska 1958 Photo of avalanche surge wave effects. Key: r = Avalanche sourcearea; rockslide dropped ~3,000 ft. (915 m); d = maximum wave height (1720 ft., 524 m)of tsunami surge onto spur of Gilbert Inlet; F = 3,600 ft., 1,097 m) wave inundation on northshore of bay; b = location of anchored fishing boat swept over land spit; a second fishingboat located near Bay entrance was sunk; e = a third anchored fishing boat that rode outtsunami wave. Modified after Miller (1958) and Miller (1960).
ee
bb
F
rr
dd
1958 Trimeline
Source
Max Run-up
InundationFishing boats ride out wave
X Fishing boat swept out to sea,two lives lost
Recommended