Exploration of the extension of two lava tubes, faults and dikes using very low frequency-electromagnetic technique in NE Jordan

• Autorzy: Al-Oufi A. , Mustafa H. A. , Al-Tarazi E. , Abu Rajab J.
• Języki publikacji: EN

Abstrakty

EN

The very low frequency-electromagnetic (VLF-EM) technique was used to delineate two sub-parallel lava tubes, faults and dikes in Umm El-Quttein area, NE Jordan. The investigation of the lava tubes was conducted through 22 VLF-EM pro-files across lava strike; the length of profiles ranged from 700 to 1700 m. The lava tubes outcrop at two sites: Azzam cave and Al-Howa tunnel, characterized by slightly weathered basalt, columnar joints and fissure zones; qualitative interpretation of Fraser and Karous-Hjelt maps differentiate those zones as linear, elongated and circular anomalous zones. The 2-D tipper inversion of VLF-EM data and resistivity imaging had the potential to screen out three anomalous zones of likely resistivity contrast: the lava tube body with resistivity over 2500 ?źm, the fractured zones with resistivity less than 500 ?źm, and the host vesicular basalt with resistivity of 1500 ?źm. The strike of lava tubes varied from SW to NE direction with depth less than 20 m and width from 10 to 30 m.

Słowa kluczowe

EN

lava tubes; VLF-electromagnetic technique; 2-D VLF-EM inversion; Basaltic plateau; Jordan

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2008
• Tom: Vol. 56, no. 2
• Strony: 466--484

Twórcy

autor

Al-Oufi A.

autor

Mustafa H. A.

autor

Al-Tarazi E.

autor

Abu Rajab J.

• Department of Earth and Environmental Sciences, Yarmouk University, Irbid, Jordan,

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