The seismicity related to the southern part of the Kenya Rift

Deep crustal earthquakes in North Tanzania, East Africa: Interplay between tectonic and magmatic processes in an incipient rift

“…Local magnitudes M L were determined using the relation of Hutton and Boore [], M L = a *log( A ) + b *log( D ) + c * D + d , where A is the maximum displacement amplitude and D is the epicentral distance. The values of the coefficients a (0.925), b (0.91), c (−1.31) come from ESARSWG (Eastern and Southern African Regional Seismological Working Group) [ Hollnack and Stangl , ]. The frequency‐magnitude distribution indicates a magnitude of completeness of 2.1.…”

Contrasted seismogenic and rheological behaviours from shallow and deep earthquake sequences in the North Tanzanian Divergence, East Africa

“…However, one has to be aware of the large heterogeneities of these catalogues, either in magnitude range or in space and time coverage. Furthermore, remaining uncertainties on hypocenters from regional catalogues (Nyblade et al, 1996;Hollnack and Stangl, 1998) also limit the availability of connections with known faults at the surface and of shape aspects of earthquakes sequences.…”

Fault kinematics and tectonic stress in the seismically active Manyara–Dodoma Rift segment in Central Tanzania – Implications for the East African Rift

“…This motivated the establishment since 1990 of a permanent seismic survey covering the Kenya Rift in the southern half of Kenya. The first results (Hollnack and Stangl, 1998) show that the southern portion of the Kenya Rift, including the North Tanzanian Divergence, displays a significant level of seismicity with more than 2000 recorded earthquakes between October 1993 and August 1996 with local magnitudes up to Ml = 5. A more detailed seismological and neotectonic structural investigation of the Lake Magadi area in South Kenya (just north of Lake Natron, Fig.…”

“…However, its high level of microseismicity was only revealed after the establishment of local and temporary dense seismic network (Nyblade et al, 1996;Hollnack and Stangl, 1998).…”