Exploration Technique: Passive Sensors
|Exploration Technique Information|
|Exploration Group:||Remote Sensing Techniques|
|Exploration Sub Group:||Passive Sensors|
|Parent Exploration Technique:||Remote Sensing Techniques|
|Information Provided by Technique|
|Lithology:||Mineral maps can be used to show the presence of hydrothermal minerals and mineral assemblages|
|Stratigraphic/Structural:||Map structures/faults and regional strain rates|
|Hydrological:||Map surface water features|
|Thermal:||Map surface temperatures|
Passive remote sensors detect energy that occurs naturally in the environment, a vast majority of the energy is in the form of electromagnetic waves reflected off of the earth from the sun. Photographs taken from satellites, which are essentially measurements of reflected sunlight, are the most common source of electromagnetic waves measured by passive sensors. http://en.wikipedia.org/wiki/Remote_sensing
Many different passive sensors and methods are used for geothermal exploration ranging from Aerial Photography to Long-Wave Infrared. Passive sensors are useful for detailed mapping of geothermal areas. A few examples of maps that can be created via passive remote sensing methods are geologic maps, mineral maps, thermal maps, and surface water maps.
Many geothermal areas are in remote areas which are difficult to access so passive remote sensing methods can be extremely valuable for gathering initial information about an area at low cost and low impact to the environment.
Passive remote sensing techniques can be very useful, however in order to make direct temperature measurements, collect samples, and preform most geophysical methods in situ field work is required. Passive sensors also have the disadvantage of only being able to receive electromagnetic radiation during the daytime for the most part.
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