Hazards: Coasts

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Last updated 2:16 PM on 7/24/26
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14 Terms

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Example of a coastal location shaped by tectonic processes?

  • Montserrat - pyroclastic surges created new land.

  • Land can be shaped & altered by marine processes.

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2 ways sea level changes due to tectonic activity?

  1. Epeirogenic

  2. Orogenic

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Epeirogenic?

  • Changing size of ocean basins through tectonic activity

  • Will change height of sea relative to land

  • Tectono-eustatic change.

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Orogenic?

  • Either earthquakes e.g. Acehenese coastline, or mountain building e.g. San Juan-Marcona.

  • During which height of land varies will change the relative height of seal level.

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What has occurred in San Juan-Marcona region (Peru)?

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What else is the Acehenese coastline linked to?

Uplift and submergence of coastlines

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Submergence & Acehenese coastline?

  • Seismic activity permanently dropped Acehenese coastline - up to 1m & uplifted nearby islands up to 2m.

  • Sudden change in relative sea level caused new coastline along most of SW coast of Aceh - resulted in rapid adjustment by the shore to these new conditions.

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Impacts to the coast?

  • Varied depending upon height of wave at impact, orientation of the coast - regard to direction of wave approach.

  • Also local topography, bathymetry, geology & vegetation cover.