ENVIRONMENTAL GEOLOGICAL HAZARDS OF SANA'A- DHAMAR BASINS, REPUBLIC OF YEMEN REPUBLIC OF YEMEN

Abstract

The present thesis deals with the main geological hazards (Seismicity, land­ sliding and vulcanicity hazards) in Sana'a - Dhamar basins. Sana'a - Dhamar basins constitute the central part of the huge Yemen volcanic basin extending from Sadah in the north to Dhamar in the south. It is located in the central western part of Republic of Yemen between latitudes 14° 30 1 - 15° 45 1 N and longitudes

14°00 1-14° 35 1 E.

The area is covered with limestones, evaporates, sandstones, and mud rock related to Amran Group, Tawilah Group and Madj-zir Formation of Jurassic, Cretaceous and Paleocene ages respectively. Volcanic and granitic rocks of Tertiary to Quaternary ages related to prolonged and multi-phased rifting tectonics, later invaded the sedimentary succession. The these rocks include alkaline granite and mafic to felsic alkaline volcanics and associating pyroclastics.