Tell me about Montserrat?

  • 3 votes

Tell me all your knowledge. I am doing a report and need lots of knowledge. Thanks

Posted Mon 25th June, 2012 @ 12:48 by PrincessGeographyxoxo

2 Answers

  • 3 votes

bbz have i got some knowledge for you!! enjoy xoxoxoxox

 

A2 Geography 6

th

September 2010 Unit 4: Geographical Research Option 1: Tectonic Activity and Hazards Chris Cartwright

Case study: Volcanic Activity in Montserrat

1) Tectonic Hazards and Causes

a)

Montserrat is situated on a destructive plate boundary where the Caribbean plate and the Atlantic plate are converging towards each other. This is the tectonic situation which would give rise to volcanic activity. The plate movements are caused by convection currents because of the heat in the mantle. As the plates move towards each other, the Atlantic plate (Oceanic) is much denser than the Caribbean plate (continental), and as a result subducts beneath the Caribbean plate. As the Oceanic crust descends, sediments, water and the heat of the mantle cause it to melt. The molten rock is less dense than surrounding crust and therefore rises to the surface. In addition, when the plates initially collided, cracks would have been made in the continental plate (Caribbean). The immense pressure of the magma underneath needs to get out somewhere and therefore the cracks in the Caribbean plate would be an ideal escape route. As the magma rises through the cracks up to the top, and increases in pressure, it eventually reaches the Earth’s surface and erupts as a volcano. However, Montserrat June 1997 eruption wasn’t just any normal eruption. It consisted of massive pyroclastic flows (Molten lava, ash and mud) which travelled at temperatures in excess of 500°C.

b) Map illustrating the location and tectonic situation of Montserrat

This map shows the location of Montserrat in the Caribbean, as well as the tectonic situation (the name of plates and the direction of movement). Source: Digby TBook.

A2 Geography 6th

September 2010 Unit 4: Geographical Research Option 1: Tectonic Activity and Hazards Chris Cartwright

The map is coloured coded to show the progress of the eruption and its impact on the island. Source: GCSE Bitesize, Geography, Plate Tectonics, Volcano.

c)

There is evidence pre-1997 of volcanic activity on Montserrat. Before 1995, the Soufriere Hills had been dormant for over 300 years. In 1995 the volcano began to give off warning signs of an eruption, such as small earthquakes and eruptions of dust and ash. Year

Month

Activity

1992 -1994

-

First Earthquake swarms detected, suggesting movement of magma inside the volcano.

1995

July

High pressures built up within the volcanic cone, as molten rock heated the groundwater – turning it into steam and causing phreatic eruptions.

1995 – 1996

November – January

New dome grows in English’s crater and rapidly buries old dome (Chances peak).

1996

March – September

First pyroclastic flows down the Tar River valley, creating a new delta in the sea.

Answered Mon 25th June, 2012 @ 12:50 by FatDarren1997xoxoxox
  • 1 vote

I have some notes on effects and responces if that helps

http://getrevising.co.uk/resources/tectonics_case_study_chances_peak_montserrat

Answered Mon 25th June, 2012 @ 12:58 by Thegirlwhoknewtoomuch - Team GR