THE 1988 MALDEN, MASSACHUSETTS LANDSLIDE: A CASE OF MULTIPLE HUMAN
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THE 1988 MALDEN, MASSACHUSETTS LANDSLIDE: A CASE OF MULTIPLE HUMANCAUSES OVER A CENTURY IN THE MAKING.
Martin E. Ross Dept. of Marine and Environmental Sciences Northeastern University, Boston, MA
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MALDEN LANDSLIDE, OCTOBER 8, 1988
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Greenish chilled border facies of Dedham Granite
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70 Az 294
S o o
30 N Az 320 o
o
2 joint sets defined shape of slide blocks
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“I liked the nice private back yard”
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Rock topple-slide or rock fall-rock
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CONTRIBUTING LONG-TERM FACTORS -over-steepened quarry face last worked in 1873 - joint sets dipping into and out of face -frost wedging
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POSSIBLE TRIGGER: GROUND VIBRATIONS
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PRESENT CONDITIONS
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ULTIMATE RESPONSIBILITY?
City of Malden -no geotechnical site-specific study required when house was built ~1980.
-issued building permits for ridiculous lots in 1988 requiring use of hydraulic hammer -inadequate regulations on vibrations
-upgraded regulations after slide
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OOPS!
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Another great field trip stop in the making!
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Brighton, MA rockslide Feb 24, 2013 6 Olive St. Brighton Volcanics 0.53” rain + 0.45” on 20th
Boston Globe