Name: Seismic Anomalies

Display Field: TYPE

Type: Feature Layer

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Description: 230,000 sq km of seismic data interpretation mapping over 28,000 seafloor seismic amplitude anomalies in the Gulf of Mexico using 3-D time-migrated seismic surveys. This mapping program means to understand the distribution of natural hydrocarbon seeps and the related benthic fauna, and to characterize other seafloor features related to the geological framework of the seafloor. These areas show anomalously high or low amplitude response over the background response, and include: Positive- Slow to moderate hydrocarbon seepage Negative- Rapid expulsion of sediment, brine, and hydrocarbons Mud volcano- Cones created by negative anomalies Confirmed mud volcano- Direct observation of mud volcanos Flow- Sediment flows from fast moving sediment or hydrocarbons Pockmark- Circular to oval depressions created by the rapid removal of sediment Cretaceous- Outcrops of Cretaceous-aged carbonate rock Lithologic- Outcrops of Cretaceous-aged carbonate rock Salt- Salt outcrops (not seep related) Slump- Downslope sediment flows Fan- Submarine channels and sand rich turbidite fans Confirmed organisms- Direct observation of chemosynthetic and coral communities Confirmed coral- Direct observation of benthic corals Confirmed gas hydrate- Direct observation of gas hydrate occurrences Confirmed gas- Direct observation of gas plumes Confirmed oil- Direct observation of oil seepage Possible oil positive- high positive oil seepage located under an oil slick Possible oil negative- low positive oil seepage located under an oil slick For more detailed information, and individual layers for download: http://www.boem.gov/Oil-and-Gas-Energy-Program/Mapping-and-Data/Map-Gallery/Seismic-Water-Bottom-Anomalies-Map-Gallery.aspx

Copyright Text: MarineCadastre.gov

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XMin: -96.1907520353751
YMin: 25.792872413634793
XMax: -86.34433610507308
YMax: 29.24184815769992
Spatial Reference: 4267  (4267)

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• Value: positive anomaly
  Label: Positive Anomaly
  Description:
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• Value: negative anomaly
  Label: Negative Anomaly
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• Value: pockmark anomaly
  Label: Pockmark Anomaly
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• Value: slump anomaly
  Label: Slump Anomaly
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• Value: flow anomaly
  Label: Flow Anomaly
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• Value: fan anomaly
  Label: Fan Anomaly
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• Value: salt anomaly
  Label: Salt Anomaly
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• Value: cretaceous anomaly
  Label: Cretaceous Anomaly
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• Value: lithologic anomaly
  Label: Lithologic Anomaly
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• Value: confirmed mud volcano anomaly
  Label: Confirmed Mud Volcano Anomaly
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• Value: mud volcano anomaly
  Label: Mud Volcano Anomaly
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• Value: confirmed gas anomaly
  Label: Confirmed Gas Anomaly
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• Value: confirmed gas hydrate anomaly
  Label: Confirmed Gas Hydrate Anomaly
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• Value: confirmed oil anomaly
  Label: Confirmed Oil Anomaly
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• Value: confirmed organisms anomaly
  Label: Confirmed Organisms Anomaly
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• Value: possible oil negative anomaly
  Label: Possible Oil Negative Anomaly
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• Value: possible oil positive anomaly
  Label: Possible Oil Positive Anomaly
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• Value: confirmed coral anomaly
  Label: Confirmed Coral Anomaly
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