1. Petroleum Engineering Department, Faculty of Petroleum & Natural Resources, Sana’a University, 1247 Sana’a, Yemen
2. Geology Departments, Faculty of Applied Science, Taiz University, 6803 Taiz, Yemen
3. Department of Geology, University of Malaya, 50603 Kuala Lumpur, Malaysia
4. Department of Geotecnics & Transportation, Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia
5. Department of Geology, University of Poonch Rawalakot, Azad Jammu & Kashmir Rawalakot 12350, Pakistan