See more from this Division: Gulf Coast Association of Geological Societies
See more from this Session: Applied Micropaleontology: Tools and Techniques for the 21st Century
Abstract:
Microfossils provide accurate paleo-indications from small diameter cores that are not readily obtainable by any other means. In particular, marsh foraminifera provide an accurate paleo-measurement of former sea levels and are a key to detecting small sea-level and crustal movements prior to megathrust earthquakes. These fossils are also useful for determining the presence of tsunami layers that are re-deposited from deeper water depths and the periodicity of such events at any one site. The same is true along coasts prone to hurricane/typhoon strikes. Foraminifera from a marsh indicate the origin of sand layers--if the layer has an abundance of calcareous offshore foraminifera, it very likely resulted from a violent storm since normal storms usually do not rework offshore material over a beach ridge and into wetland area. These layers are rapidly buried and leave an excellent record of hurricanes in the coastal setting. With sufficient records, probabilities of hurricane strikes, tsunami occurrences, earthquakes, and precursors to megathrust earthquakes can be determined for specific areas that could save many lives with the development of early warning systems.
See more from this Division: Gulf Coast Association of Geological Societies
See more from this Session: Applied Micropaleontology: Tools and Techniques for the 21st Century