Fekadu Kebede

Addis Ababa University

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Ota Kulhánek

Uppsala University

T. van Eck

Royal Netherlands Meteorological Institute

G. Turyomurugyendo

Ministry of Agriculture, Animal Industry and Fisheries

F. Tugume

Geological Survey Department

D. K. Lombe

Karl Köch

Corning (United States)

Won‐Young Kim

Columbia University

L.S. Chapola

The Catholic University of Malawi

Kuvvet Atakan

University of Bergen

V. Midzi

Council for Geoscience

Cooperative Institutions

Uppsala University

Ministry of Agriculture, Animal Industry and Fisheries

Utrecht University

United States Air Force Research Laboratory

University of Bergen

Geological Survey Department

Pennsylvania State University

United States Geological Survey

Addis Ababa University

National Autonomous University of Honduras

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Recent seismicity of the East African Rift system and its implications

Physics of The Earth and Planetary Interiors (1991)

Fekadu Kebede Ota Kulhánek

East African Rift

Rift zone

Rift valley

10.1016/0031-9201(91)90045-j

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Citations (56)

The unique contribution of the IDC Reviewed Event Bulletin to global seismicity catalogues

EGUGA (2010)

Karl Köch Fekadu Kebede

For monitoring the Comprehensive Nuclear-Test-Ban Treaty (CTBT) the International Monitoring System (IMS) network is currently being established that will eventually consists of 241 seismic, hydroacoustic and infrasound stations. The final result of processing and analysis of seismological and other waveform technology data from these stations is the Reviewed Event Bulletin (REB), which has been issued by the International Data Center (IDC) under provisional operation since February 2000 on a daily basis, except for a total of 28 days. The nearly 300,000 events produced since then correspond to more than 25,000 events per year. As an accompanying effort to the bulletin production at the IDC, quality assurance work has been carried out for the REB for the years from 2000 to 2008 through comparisons to similar bulletins of global seismicity, issued by the ISC and the National Earthquake Information Center (NEIC) of the United States Geological Survey. The comparisons with the NEIC bulletin concentrate on a timely identification of larger events that were either missed during interactive analysis at the IDC or which have been significantly mislocated. For the scope of this study the comparisons with the ISC bulletin are the focus, as this bulletin provides the most complete reference to global seismicity, even though it becomes available only after about two years of event occurrence. In our quality assessments we aimed at evaluating the consistency of event locations for common events, i.e. found in both the REB and the ISC bulletin having been relocated by ISC; the degree and the geospatial location of the events only produced in the REB and verified not being bogus, and those ISC relocated events not contained in the REB and which were missed during IDC analysis.

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Seismic hazard assessment in Eastern and Southern Africa

Annals of Geophysics (1999)

V. Midzi Dumisani John Hlatywayo L.S. Chapola Fekadu Kebede Kuvvet Atakan

Seismic 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 40°S-25°N and longitudes 10°E 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 40°S-25°N and 10°E-55°E, with homogeneous magnitudes (M S ). 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 of PGA values indicate relatively high hazard along the East African rift system. In the northern segments of the rift system, they exceed 250 gals for 10% probability of exceedence in 50 years.

Return period

10.4401/ag-3770

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Citations (71)

Source parameters and tectonic implications of selected earthquakes in Afar depression of Ethiopia and neighbouring regions

Fekadu Kebede

Source parameters and tectonic implications of selected earthquakes in Afar depression of Ethiopia and neighbouring regions

Depression

Source

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Spatial and temporal variations of b-values along the East African rift system and the southern Red Sea

Physics of The Earth and Planetary Interiors (1994)

Fekadu Kebede Ota Kulhánek

East African Rift

Rift zone

Rift valley

10.1016/0031-9201(94)90092-2

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Citations (30)

Probabilistic seismic hazard assessment for the Horn of Africa based on seismotectonic regionalisation

Tectonophysics (1997)

Fekadu Kebede T. van Eck

Seismotectonics

Regionalisation

10.1016/s0040-1951(96)00215-6

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Citations (31)

Source parameters of selected earthquakes on the central and western margin of Afar

Tectonophysics (1989)

Fekadu Kebede Ota Kulhánek

Seismogram

Seismic moment

Moment magnitude scale

10.1016/0040-1951(89)90274-6

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Citations (9)

Dynamic source parameters of the March‐May 1969 Serdo Earthquake Sequence in central Afar, Ethiopia, deduced from teleseismic body waves

Journal of Geophysical Research Atmospheres (1989)

Fekadu Kebede Won‐Young Kim Ota Kulhánek

Long‐period teleseismic P and S waveforms for the largest four earthquakes in the Serdo sequence are compared with synthetic seismograms to infer mechanisms, focal depths, source time functions, and dynamic energy release. For all four events studied, the mechanisms are predominantly strike slip. Depth estimates obtained for the four earthquakes by matching synthetic seismograms to the observations are found to lie between 5 and 8 km. The azimuthal variation of observed body wave duration for the main event indicates that the rupture propagated from NE to SW. Average seismic moments obtained from body wave synthetics vary from 4.6×10 17 to 2.5×10 18 N m. Average final displacements, stress drops, and lengths of the fault are found to lie between 0.16 and 0.56 m, 0.45 and 1.56 MPa, and 10 and 16 km, respectively. The low stress drop value obtained may indicate the presence of softer materials near the source. The energy release shows that the mode of energy release during the sequence took place in two steps, mainly by the two largest shocks.

Seismogram

Seismic moment

Seismic energy

Sequence (biology)

10.1029/jb094ib05p05603

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Citations (27)

Recent seismicity of the East African rift system and its implications

Tectonophysics (1992)

Fekadu Kebede Ota Kulhánek

East African Rift

10.1016/0040-1951(92)90009-u