Condensed Case Studies

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Geography – Case Studies (condensed)

San Francisco Earthquake, 1989

  • California is on a conservative plate margin
  • Pacific plate west, north American plate east
  • Earthquake - 7.1
  • Struck at 5.04 pm, October 17th 

  • 63 deaths
  • 1 million homes without electricity
  • Damage estimated at $7 billion

  • Interstate 880 collapsed, trapping motorists
  • SF and Oakland airport closed - damaged
  • Marina district in Bay area extensively damaged, collapsed buildings, fires from ruptured gas mains

Mount St. Helen’s Eruption, 1980

  • Washington State, NW USA
  • Part of Western Cordillera,
  • Destructive plate margin

  • Erupted early Sunday morning, May 1980
  • Rumbled for 2 months - 5 mile exclusion zone
  • Earth tremors triggered landslide
  • Pyroclastic flow (rock, gas, steam)
  • Ash cloud 12 miles high
  • 57 deaths (low because Sunday morning)
  • Rivers + lakes filled with mud
  • 400m lost from top of volcano
  • Logging camps, roads, bridges and houses destroyed

Holderness Coast, the

  • NE England
  • Retreats 1 or 2 metres per year
  • Strong prevailing winds (to west)  strong longshore drift
  • Soft clay cliffs  easy to erode
  • Mappleton, south of Hornsea on cliff top is in danger
  • 1991 – rock armour placed at cliff base, and rock groynes on beach
  • Longshore drift moving south from Mappleton was stopped  more erosion south of Mappleton

China

  • Had encouraged large families to increase workforce, but couldn’t be sustained.
  • 1975- families restricted to one child- at current rate
  • Families with more than one child would lose benefits and be fined
  • Forced abortions and sterilisations
  • Incentives e.g. child care for one child families
  • Birth rate 44 in 1950, 17 in 2000.

  • In rural areas large families tradition- children provide labour/ look after elderly
  • Compromise- if first child a girl, could have 2 kids
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  • China will not have enough workers in the future
  • Girl babies undervalued, so killed so they can have a boy

Mexico  USA

  • Land degradation leads to many abandoning their rural lifestyles and farms
  • 40% of people are unemployed in Mexico
  • GNI/capita $8070 Mexico, $31910 USA
  • The closeness of the countries  migration = very easy
  • Number of immigrants tightened therefore many (about 3 million) work illegally
  • Some entered on visas, but remained when they expired
  • Health conditions bad at the border; TB

Barriers

  • Big fences
  • Border guards
  • Live in unsanitary camp ...

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