SEGJ Technical Conference

Applicability of Airborne Electromagnetics to Coastal Areas: Northwestern Awaji Island case

Abstract Airborne electromagnetics (AEM) is a method to survey both on land and off-shore underground hydrogeological structure via electrical resistivity. As far as on land survey, conventional AEMs are applicable to a depth of ~300 m while our GREATEM method has the ability to survey as deep as ~1000 m. Last year we reported a case study of Kujukuri coastal area, where sedimentary rocks prevail, here, we show a case study of northwestern Awaji coastal area, where granitic rocks are dominant. The area also has a bunch of electromagnetic data in relation to the survey of the Nojima fault, the culprit of 1995 Kobe earthquake. It was revealed that the GREATEM result was almost consistent with the previous results and also the method can gain underground resistivity information as deep as 300-500 m in off-shore region.