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Download Geology of Costa Rica
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Geology of Costa Rica Geologic Hazards • • • • Earthquakes Tsunami Volcanism Slope Hazards Earthquake Safety • You may well experience an earthquake • Earthquakes don’t kill people; Buildings kill people • We will not be in high risk settings • Minor shaking: no hazard • Major or prolonged shaking: Get outside • Avoid buildings and power lines • Trees are well engineered seismically • If inside, get under something sturdy or brace in a doorway. Tsunamis • Warning Signs – Strong earthquake on coast – Abrupt changes in sea level – up or down • Get to high ground or inland immediately • Do not pass Go, do not collect $200 Volcanism • We will not go anywhere near active volcanoes or known hazardous areas. • If activity occurs, we will evacuate immediately • I am a volcano expert. If you see me running, try to catch up. Slope Hazards • • • • • Landslides due to earthquakes Mudflows due to heavy rains Get out of the way Get off slope if you sense movement Get away from streams if water level starts to rise Rips • When waves break parallel to a beach, rips occur Rips, Lake Superior Oblique Rips A Subduction Zone How Arcs Grow Exotic Terranes Fit of Continents Across the Atlantic The Caribbean Opening of the North Atlantic Yucatan Rifts Away Volcanic Plateau Begins to Form Plateau Encounters Subduction Zone Yucatan Basin Opens East Pacific Rise Approaches Now Serpentinite Bedded Chert Pillow Lava Pillow Lava Graywacke Flysch
