Helicopter-borne Electromagnetics (HEM) German North Sea coast - Models
Description
This dataset has been compiled within the BGR project "D-AERO-Auswertung" based on several survey area located along the German North Sea coast. The BGR helicopter (Sikorsky S-76B) is used for airborne geophysical surveying of the Earth’s subsurface. The standard equipment comprises the methods electromagnetics, magnetics and radiometrics. The active multi-frequency, helicopter-borne electromagnetic (HEM) system, which consists of circular (diameter about 0.5 m) transmitter and receiver coils (horizontal separation about 8 m) operating at five and since 2007 at six system frequencies, is housed by a flying tube (bird) about 40 m beneath the helicopter. The HEM system used before 2002 consisted of rectangular coils (horizontal separation slightly less than 7 m) and five system frequencies (0.4 - 190 kHz). The ratio of received and transmitted signal yields to the electrical conductivity down to 50/150 m depth in case of conductive/resistive subsurface. Horizontal resistivity (= inverse of conductivity) sections are derived at several depths from multi-layer inversion results (1D resistivity-depth models).
Resources
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Description |
Link |
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https://download.bgr.de/bgr/aerogeophysik/NordseekuesteHEMModelle/geotiff/HEM-Modelle_Nordseekueste.zip |
Tags
- airborne-geophysics
- apparent-resistivity
- hubschrauber-elektromagnetik
- halbraumwiderstand
- hansestadt-hamburg
- centroid-depth
- aerogeophysik
- schwerpunktstiefe
- niedersachsen
- geology
- helicopter-borne-electromagnetics
- elektrische-leitfähigkeit
- schleswig-holstein
- resistivity
- spezifischer-widerstand
- electrical-conductivity