Abstract
Teleseismic events have been selected from a database of earthquakes with three components which were recorded between February 2005 and January 2007 by five seismic stations across the Garoua rift region which constitutes a part of the Cameroon Volcanic Line (CVL). The iterative time deconvolution performed by [1] applied on these teleseismic events, permitted us to obtain P-receiver functions. The latter were subsequently inverted in order to obtain S-wave velocity models with respect to depth which were then associated to the synthetic receiver functions. This made it possible to explain the behavior of the wave and the medium through which they traveled. The main results obtained indicate that: (1) The lithosphere appears to be thin in its crustal part with a mean Moho depth of 28 km and S wave velocity of 3.7 km/s. (2) In its mantle part, the lithosphere is thick in nature having a thickness that varies between 42 km and 67.2 km. The greatest depth is noticed towards the center located around Garoua while the least depth corresponds to a location around Yagoua in the North. The Low velocity zone which makes it possible to determine the depth of the lithosphere was seen to have a thickness which varies between 42 km and 118.8 km. (3) The synthetic receiver functions associated to shear velocity models reveal that, on one hand the wave has really undergone a conversion and multiple conversions such that the existing Ps phase and subsequent reverberations PpPs and PpSs have mean times of 3.7 s, 11 s and 17.6 s respectively. On the other hand, they reveal an attenuation shown by the decrease in the amplitude of the aforementioned phases along a South-North direction in the Garoua rift.
Highlights
The Garoua rift region is the continuation of the Northern section of Cameroon Volcanic Line and the part of the large Benue trough which, is situated between the latitude 8 ̊ and 11 ̊ North and longitudes 13 ̊ and 16 ̊ East
Teleseismic events have been selected from a database of earthquakes with three components which were recorded between February 2005 and January 2007 by five seismic stations across the Garoua rift region which constitutes a part of the Cameroon Volcanic Line (CVL)
Regrouping the types and times of different conversions and multiple conversions coming from the curves of synthetic receiver functions from the Garoua rift stations, Table 3 shows that, a good agreement exists between the curves, and the wave has really undergone conversion
Summary
The Garoua rift region is the continuation of the Northern section of Cameroon Volcanic Line and the part of the large Benue trough which, is situated between the latitude 8 ̊ and 11 ̊ North and longitudes 13 ̊ and 16 ̊ East. Structural and geological studies by [2] and [3] show that the Garoua basin is an E-W to N120 trending trough infilled by Middle to Upper Cretaceous marine sandstones. These sediments have been described by [4] and [5]. The basin is limited by normal faults which outcrop on its northern and southern borders [3] [8] [10]
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