P1 Section C (Hazards) Flashcards
What causes seismicity
Seismicity can be caused by mining, fracking, reservoir construction or most commonly plate tectonics
How does plate tectonics cause seismicity
plate tectonics cause seismicity as friction between plates builds stresses in the lithosphere until there is a release of this stress sending a series of seismic shockwaves from the focus until it travels through the ground to the epicentre where there is most intense ground shaking
What are the types of focus earthquakes
types of focus earthquakes are shallow, intermediate and deep
What is shallow earthquake
Shallow earthquake is 0-70km deep which create greatest damage and occur at constructive, conservative and destructive margins
What is intermediate earthquake
Intermediate earthquake is 70-300km deep
What is deep earthquake
Deep earthquake is 300-700km deep which occur at destructive margins
Types of seismic wave
Types of seismic wave are body wave and surface wave
What is body wave
Body waves are either P waves or S waves and travel through the interior of the earth and arrive before surface waves and are higher frequency
P wave
P wave is the fastest wave and can move through solid rock and liquids via compressions of pulling and pushing rocks
S wave
S wave is slower than P wave and can only move through solid rock and move rock particles up and down or side to side perpendicular to the direction of the wave travel
What is surface wave
Surface wave travel near to the surface and are slower than P and S waves
Causes of tsunamis
Causes of tsunamis are usually seismic activity like ocean floor earthquakes or submarine eruptions but can be caused by landslides, meteor and asteroid strikes
Features of a tsunami
Features of a tsunami are very low wave height until reach the shore, very long wave length between 100km and 1000km in open water, wave period between 10 and 60 minutes and speeds between 640 and 970kmph
What is Pacific Tsunami Warning System
Pacific Tsunami Warning System is a warning system based in Hawaii which gives many hours warning of approaching waves following seismic events
Location of Haiti
Haiti between the Caribbean Sea and North Atlantic Ocean at the conservative margin where the Caribbean plate and North American plate slip past each other
When was Haiti earthquake
Haiti earthquake was 2010
Death toll of Haiti 2010 EQ
Death toll of Haiti 2010 is estimated around 300,000 confirmed 100,000
Primary impacts of Haiti 2010 EQ
Primary impacts of Haiti 2010 are 70% schools destroyed, landslides destroyed wildlife, liquefaction on loose sediment caused subsidence of building foundations and also governmental buildings and 50* hospital were badly damaged
Secondary impacts of Haiti 2010
Secondary impacts of Haiti 2010 are half people in Port-au-Prince had no access to latrines so threw buckets of waste onto streets, people looted from shops due to lack of food, 1.5 million became homeless one year after and Haiti government crippled due to loss of civil servants and destruction of ministries
National response to Haiti 2010 EQ
National response to Haiti 2010 was government requesting $3.86 billion through action plans and support and 55 donors responded by pledging $5.6 billion and Dominican Republic offered support and accepted some refugees
International response to Haiti 2010
International response to Haiti 2010 was Habitat for Humanity helped 250,000 wounded in a 5 year recovery programme and they also built 300 permanent homes and created 2,100 job opportunities and $7 million was donated by 25,000 international donors
How is Haiti better prepared for the future
Haiti is better prepared for the future as over 2,800 CCPC members have received training that strengthened the capacity to evacuate at-risk populations and this proved instrumental in saving lives of 2021 Haitian EQ
What factors influenced the damage of the Haiti 2010 Earthquake
The factors which influenced the damage of the Haiti 2010 Earthquake are a combination of 13km focus, magnitude 7 and historic suffering through decades of conflict, poor governance and extreme poverty and 170th development in the world
How is Kobe better prepared for the future
Kobe is better prepared for the future as SMART meters have been installed so that if there is a breach in a gas line then supply will automatically shut off and also rubber shock absorbers were planned into the newly constructed buildings and 10 regions have been designated for intensive monitoring and earthquake-proof buildings have received major investment following 6,9 richter scale EQ
What was Japan Tsunami 2011 caused by
Japan Tsunami 2011 was caused by a magnitude 9 EQ under the Pacific Ocean 100km from the east coast of northern Honshu which led to sea water displacement
Primary impacts of Japan tsunami 2011
Primary impacts of Japan tsunami 2011 was waves surging 10km in land flooding an area of 500km^2, ground shakes caused collapsing buildings and fires from broke gas and petroleum pipes and over 19,000 deaths
Secondary impacts of Japan tsunami 2011
Secondary impacts of Japan tsunami 2011 are $360 billion in damages, half a million homeless, 6 million without electricity and explosions and radiation leaks at a nuclear power plant which spread fears of nuclear disaster leading to many panic-sales across global stock markets
Short term responses to Japan tsunami 2011
Short term responses to Japan tsunami 2011 were 100,000 soldiers mobilised, UK sent 63 search and rescue specialists and a medical support team and an exclusion zone was made around the power plant
Long term responses to Japan tsunami 2011
Long term responses to Japan tsunami 2011 are restart of nuclear reactors in 2016, special zones for reconstruction set up to encourage rapid building and tax incentives offered to support investors and in 2013, a new ungraded warning system was unveiled as many locals underestimated their risk
How was Japan prepared for the tsunami
Japan was prepared for the tsunami as a warning system have minutes of warning to the people on 3,000km coastlines at risk, so many could try escape
What caused Indian Ocean tsunami 2004
Indian Ocean tsunami 2004 was caused by a magnitude 9.1 EQ due to the rupture of the Sunda Megathrust fault in the between the Burma plate and Indo-Australian plate