Seismic hazard assessment in Eastern and Southern Africa.

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dc.contributor.authorMidzi, Vunganai
dc.contributor.authorHlatywayo, Dumisani J.
dc.contributor.authorChapola, Lostina S.
dc.contributor.authorKebede, Fekadu
dc.contributor.authorAtakan, Kuvvet
dc.contributor.authorLombe, Daniel K.
dc.contributor.authorTuryomurugyendo, Gadi
dc.contributor.authorTugume, Fred Alex
dc.date.accessioned2013-09-24T10:07:03Z
dc.date.accessioned2023-06-26T13:01:47Z
dc.date.available2013-09-24T10:07:03Z
dc.date.available2023-06-26T13:01:47Z
dc.date.issued1999-12
dc.description.abstractSeismic hazard assessment for the Eastern and Southern Africa region was done using the probabilistic approach. Seismic hazard maps for 10% exceedance in 50 years, 10% exceedance in 100 years, as well as for 50 and 100 years return periods were prepared using the FRISK88M software. The area involved covers a wide region bounded by latitudes 400 S-25°N and longitudes 100E and 55°E. Input parameters for the computations were obtained using the recent earthquake catalogue compiled by Turyomurugyendo. The catalogue which covers the time period 627-1994, contains earthquakes within the area bounded by 400 S-25°N and 100 E-55°E, with homogeneous magnitudes (M). Since a Poisson model of earthquake occurrence is assumed, dependent events were cleaned from the catalogue. Attenuation relations for the Eastern and Southern Africa region based on the strong motion data are virtually non-existent. However, attempts have been made recently by Jonathan 'and Twesigomwe to establish an average attenuation relation for the region. These relations were used in the computations. Possible uncertainties in the attenuation relations were accounted for using the logic-tree formalism. The results are presented in seismic hazard maps in terms of Peak Ground Acceleration (PGA) for the mean and the 85th percentile. The distribution ofPGA values indicate relatively high hazard along the EastAfrican rift system. In the northern segments of the rift system, they exceed 250 gals for 10% probability of exceedence in 50 years.en_US
dc.description.sponsorshipInternational Lithosphere Program (ILP) through the Global Seismic Hazard Assessment Program (GSHAP). UNESCO and lASPE for contributing some funding at various workshops related to the preliminary work on seismic hazard.en_US
dc.identifier.citationMidzi et al (1999). Seismic hazard assessment in Eastern and Southern Africa. Annali DI GEOFISICA, Vol no 42, N. 6.en_US
dc.identifier.urihttp://196.220.97.103:4000/handle/123456789/318
dc.language.isoenen_US
dc.publisherANNALI DI GEOFISICA,en_US
dc.rights.licenseThis article was downloaded from NUST Institutional repository, and is made available under the terms and conditions as set out in the Institutional Repository Policy.en_US
dc.subjectseismic hazard assessmenten_US
dc.subjectAfrican rift earthquakesen_US
dc.subjectUN/IDNDRen_US
dc.titleSeismic hazard assessment in Eastern and Southern Africa.en_US
dc.typeArticleen_US
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