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International Journal of Innovation and Applied Studies
ISSN: 2028-9324     CODEN: IJIABO     OCLC Number: 828807274     ZDB-ID: 2703985-7
 
 
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THE FIRST VIEW ON STRESS DROP OF SMALL EARTHQUAKES IN THE KIVU REGION, WESTERN BRANCH OF EAST AFRICAN RIFTS SYSTEM


Volume 10, Issue 4, March 2015, Pages 1213–1224

 THE FIRST VIEW ON STRESS DROP OF SMALL EARTHQUAKES IN THE KIVU REGION, WESTERN BRANCH OF EAST AFRICAN RIFTS SYSTEM

Silvanos Fiama Bondo1, T. GEORGE MAVONGA2, Jean Robert Nshokano3, Clarisse Balegamire Njovu4, SERGE BUTARA MUBANE5, M. ALBERT JEJE6, and L. JUSTIN LONGI7

1 Département de Géophysique, Centre de Recherche en Sciences Naturelles (CRSN/Lwiro), Sud Kivu/DS Bukavu, RD Congo
2 Observatoire volcanologique de Goma (OVG/GVO), North Kivu, RD Congo
3 Centre de Recherche Géologique et Minière, Station du Sud – Kivu/Lwiro, RD Congo
4 Département de Géophysique, Centre de Recherche en Sciences Naturelles (CRSN/Lwiro), Sud Kivu/DS Bukavu, RD Congo
5 Centre de Recherche Géologique et Minière (CRGM/Lwiro), South Kivu, RD Congo
6 Department of Geophysics, Centre de Recherche en Sciences Naturelles (CRSN/Lwiro), South Kivu/DS Bukavu, RD Congo
7 Department of Geophysics, Centre de Recherche en Sciences Naturelles (CRSN/Lwiro), South Kivu/DS Bukavu, RD Congo

Original language: English

Received 24 November 2014

Copyright © 2015 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract


Digital seismograms recorded at seismic station of Lwiro, between August 1993 and March 1994, are used to investigate the spatial distribution of stress drop estimated following the spectral Brune's model in the Kivu region and its vicinities. It is revealed that a small stress drop (<=1) is observed in these zones. The high stress drops are observed in the granitic intrusion in the zone A and D (Idjwi Island) and B, on fracture linked Nyiragongo and Nyamuragira volcanoes, and the lowest is very scattered in the zone C, D and E. The study has revealed that the stress drops correlate with fault types as the high value corresponds to reverse faults in the zone B, and the lowest to normal and strike slip faults in other zones. The Idjwi Island also presents a high stress drop where three types of faulting appear. Small stress drops are attributed to strong barriers of seismic rupture or no long rupture propagation along the pre

Author Keywords: spatial distribution, Stress drop, corner frequency, small earthquakes and Kivu and vicinities.


How to Cite this Article


Silvanos Fiama Bondo, T. GEORGE MAVONGA, Jean Robert Nshokano, Clarisse Balegamire Njovu, SERGE BUTARA MUBANE, M. ALBERT JEJE, and L. JUSTIN LONGI, “THE FIRST VIEW ON STRESS DROP OF SMALL EARTHQUAKES IN THE KIVU REGION, WESTERN BRANCH OF EAST AFRICAN RIFTS SYSTEM,” International Journal of Innovation and Applied Studies, vol. 10, no. 4, pp. 1213–1224, March 2015.