Author:  "K. Rainer Massarsch"  at SMTP
Date:    5/24/97  11:55 PM
Priority: Normal
TO: Mete Oner at CEAT
TO: "Prof. Bengt B. Broms"  at SMTP
TO: "Rod Buckell"  at SMTP
TO: "Tony Butcher"  at SMTP
TO: "Dr. Mike Byfield"  at SMTP
TO: "Campanella; Dick - Professor @ UBC"  at SMTP
TO: "Deep Foundations Institute; Geordie Compton"  at SMTP
TO: "Prof. Charles Dowding"  at SMTP
TO: "Dr. Vincent P. Drnevich; P.E."  at SMTP
TO: "Jan Fallsvik"  at SMTP
TO: "D. Michael Holloway"  at SMTP
TO: "Robert Holtz"  at SMTP
TO: "Dr. G. Huber"  at SMTP
TO: "Steve Kramer"  at SMTP
TO: "Stefan Krieg"  at SMTP
TO: "Andreas Massarsch"  at SMTP
TO: "Y. M. Na"  at SMTP
TO: "Dr. Richard S. Olsen"  at SMTP
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TO: "Bengt Rydell"  at SMTP
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CC: "Rainer Massarsch"  at SMTP
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A major landslide occurred on May 23 in the village of Vagnhaerad, about 
100 km south of Stockholm, destroying more than 15 houses and injuring 4 
people. More than 100 inhabitants had to be evacuated.
At 1 o'clock in the morning on May 23, a major land slide affected an area 
several hundred meters long and causing lateral
displacements of up to 40 m. The slide took place several days after a 
of extended rainfall. The area had previously been investigated by 
geotechnical engineers and judged to be safe. Three days prior to the 
landslide, a minor slip had occurred towards the Trosa river. Geotechnical 
investigations were then carried out. 
The soil deposit consists of a 2 m thick dry crust on top of an up to 10 m 
thick clay layer. At the bottom of the clay stratum, layers of silt and clay 
occur. The rock surface below the clay deposit is inclined at an angle of 
about 10m degrees. The soil deposit did not contain clays with high 
sensitivity, which most likely would have lead to larger displacements and 
many casualties.  
The location of the landslide is not too far from Getaa, where a large 
landslide occurred in 1917. As a result of the Get? disaster, the Swedish 
Geotechnical Commission was created. 
K. Rainer  Massarsch