Table F-1
Estimated susceptibility of sedimentary deposits to liquefaction during
strong ground motion (after Youd and Perkins, 1978).
General
Likelihood that Cohesionless Sediments, When Saturated,
Distribution of
Would be Susceptible to Liquefaction (by Age of Deposit)
Pre-
Cohesionless
Pleistocene
Sediments in
<500 yr
Holocene
Pleistocene
>2 Ma
Deposits
Modern
>11 ka
11 ka - 2 Ma
Type of Deposit
(a) Continental Deposits
River channel
Locally variable
Very high
High
Low
Very low
Floodplain
Locally variable
High
Moderate
Low
Very low
Alluvial fan and plain
Widespread
Moderate
Low
Low
Very low
Marine terraces and plains
Widespread
---
Low
Very low
Very low
Delta and fan-delta
Widespread
High
Moderate
Low
Very low
Lacustrine and playa
Variable
High
Moderate
Low
Very low
Colluvium
Variable
High
Moderate
Low
Very low
Talus
Widespread
Low
Low
Very low
Very low
Dunes
Widespread
High
Moderate
Low
Very low
Loess
Variable
High
High
High
Unknown
Glacial till
Variable
Low
Low
Very low
Very low
Tuff
Rare
Low
Low
Very low
Very low
Tephra
Widespread
High
High
?
?
Residual soils
Rare
Low
Low
Very low
Very low
Sebka
Locally variable
High
Moderate
Low
Very low
(b) Coastal Zone
Delta
Widespread
Very high
High
Low
Very low
Estuarine
Locally variable
High
Moderate
Low
Very low
Beach
High wave-energy
Widespread
Moderate
Low
Very low
Very low
Low wave-energy
Widespread
High
Moderate
Low
Very low
Lagoonal
Locally variable
High
Moderate
Low
Very low
Fore shore
Locally variable
High
Moderate
Low
Very low
(c) Artificial
Uncompacted fill
Variable
Very high
---
---
---
Compacted fill
Variable
Low
---
---
---
F-14
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