A GEO-ELECTRICAL RESISTIVITY CONCEPTUAL MODEL UPDATE FOR THE MENENGAI GEOTHERMAL SYSTEM

Abstract

A geo‐electrical conceptual model for  the Menengai geothermal prospect is built using magnetotellurics  data  both of  low  and  high amplitude  collected over  time. The  data  is  corrected  for  static  shift  by  use  of  transient  electromagnetic  data collected  at  the  same  data  stations.  Data  collected  previously  in  the  same  area using these techniques is also incorporated into the working data base. The entire data  set  is  jointly  inverted  and  cross  sections  taken  along  four  profiles  cutting across the caldera and intersecting major structures in the area. An interpretation of  these  results  show  the  existence  of  geothermal  indicators  within  the  caldera bounds  with  a  general  north‐eastern  to  south‐western  trend  and  is  significantly shallower towards the east