Notes on Earthquake Shaking in Soils, Guatemala Earthquake of 4 February 1976.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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A reconnaissance examination was made of earthquake effects in soils resulting from the 4 February 1976 earthquake in Guatemala. The earthquake was caused by strike-slip movement along a discrete fault plane in the Motagua Valley with a length of about 200 km. The motagua Valley is determined by a zone of active faults that date back to Cretaceous time or older. Several distinct faults are recognizable on air photos but others may have been obscured by alluviation. The valley is a zone of active faults. Although movement was along only one plane, the entire mapped length of the Motagua fault zone participated in the movement. Extensive landslides were induced in deposits of pumice ash. Liquefaction is a probable contributing factor to at least two of the larger landslides in which entire valleys were blocked with debris. At Puerto Barrios there is a suggestion that liquefaction occurred in sands at 70 to 100 ft below the surface. Here, again, the liquefaction was associated with very light earthquake shaking.
- Soil Mechanics