Analysis Of The Inter-dyking Deformation Pattern At The Ongoing Dabbahu-manda Hararo (afar) Rift Segment Using Gps And Insar Techniques

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The Afar Depression, in the northeastern part of Ethiopia, offers unique opportunities to study therntransition from continental rifting to ocean floor spreading. This process, which is the outcome ofrntectono-magmatic events, has been under investigation using different geophysical and geologicalrntechniques. The current study mainly focused on GPS and InSAR methods to analyze the inter-dykingrndeformation pattern along the Dabbahu-Mnada Hararo (Afar) rift segment. The InSAR data was used tornidentify the time of dyke events and the GPS data to study the inter-diking deformation pattern. Arnsequence of 12 dyke events occurred from June 2006 to June 2009 and based on the GPS data two majorrnpattern of deformation have been identified. These are being categorized into before and after June 2009rndyke events. Most of the GPS stations before June 2009 showed larger displacement rate whereas afterrnJune 2009 intrusion, the displacement in most of the stations was relatively smaller. Even though therndeformation process is still active, sites such as DAFT, DA45, DAYR and DATR indicated that therndisplacement rate is relatively stabilizing in the post seismic relaxation period. Moreover, sites such as,rnDA25 and DA35, had large offsets in their time series right at the time of dyking events, which is anrnindication of major deformation due to the rifting process. Except the distant sites DA60 and DASM allrnthe other stations were mostly affected by the dyke intrusion, such that there was an offset in the datarnduring the dike intrusion. Stations DA25, DA35, DA45, DA60, DAFT and DAYR that are located in thernwest side of the rift, where the 2005 diking event took place, showed displacement as large asrn~84mm/yr, ~53mm/yr, ~46mm/yr, ~17mm/yr, ~23mm/yr,~17mm/yr and ~6.36mm/yr towards the westrndirection respectively. Sites DASM, GABH and DABB have a displacement towards the North Eastrndirection. The site GABH, which is situated in Gabh’o volcano, shows rapid inflation from January tornJune (2006) and continued with a slow uplifting till February 2007. Inflation began in June 2006 in therncomposite volcano DABB site while subsidence that amount of about 16mm/yr is observed in Semerarnstation called DASM.rnKey words: Afar, Deformation, Inter-Dyking, InSAR, GPS, Rifting

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Analysis Of The Inter-dyking Deformation Pattern At The Ongoing Dabbahu-manda Hararo (afar) Rift Segment Using Gps And Insar Techniques

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