Integrated geophysical analysis of the April 2017 Moiyabana intra-plate earthquake, Botswana

Max Moorkamp*, Estella Atekwana, I. Fadel, Alice-Agnes Gabriel, Folarin Kolawole, Elisha Shemang, Calistus Ramotoroko, M. van der Meijde, Kevin Mickus, Ame Selepeng, Loago Molwalefhe

*Corresponding author for this work

Research output: Contribution to conferenceAbstractAcademic

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Abstract

The 3 April 2017 Moiyabana intra-plate earthquake in central Botswana occurred in a region that, until then, had been assumed to be seismically quiet. Its location away from the East African Rift system in a Proterozoic mobile belt between Archean Cratons has raised questions on the triggering mechanism and sparked various studies investigating the crustal and mantle structure in the region, the focal mechanism and the displacement associated with the event. Aeromagnetic and magnetotelluric data indicate movement on a NW striking and NE dipping fault. However, the details of the fault geometry differ when analysing each dataset independently. The geophysical inversion results plus reconstructions of fault movement from InSAR data are all compatible with normal movement and reactivation of a previous thrust fault. An open question though is to which degree fluids are responsible for triggering the event. Here we present first results of reconciling the different available datasets in an integrated analysis. We will show an updated geophysical model of the region around the hypocenter. Such a model can help to shed light on the rupture processes during the earthquake and forms a first step to unravel the genesis of this intra-plate event.
Original languageEnglish
Number of pages1
DOIs
Publication statusPublished - 4 May 2020
EventEGU-General Assembly 2020: Sharing Geoscience Online - Vienna, Austria
Duration: 4 May 20208 May 2020
https://www.egu2020.eu/
https://egu2020.eu/

Conference

ConferenceEGU-General Assembly 2020
Abbreviated titleEGU 2020
CountryAustria
CityVienna
Period4/05/208/05/20
Internet address

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