Temporal variation of Seismic coda wave attenuation in the Virunga volcanic region before the eruption of Nyamulagira of 06 November 2011, Democratic Republic of Congo
| dc.contributor.author | Fiama, S.B. | |
| dc.contributor.author | Mavonga, G.T. | |
| dc.contributor.author | Subira, J.M. | |
| dc.contributor.author | Kervyn, F. | |
| dc.contributor.author | Delvaux, D. | |
| dc.contributor.editor | D. Delvaux, C. Michellier, O. Dewitte | |
| dc.coverage.spatial | Africa - Central | |
| dc.coverage.spatial | Congo, The Democratic Republic of the | |
| dc.coverage.temporal | Present-day | |
| dc.date | 2017 | |
| dc.date.accessioned | 2024-03-14T13:13:57Z | |
| dc.date.available | 2024-03-14T13:13:57Z | |
| dc.identifier.uri | https://orfeo.belnet.be/handle/internal/11782 | |
| dc.description | Five periods characterize the temporal variation of the quality factor of seismic coda waves attenuation Q_C^(-1)(Q_0^(-1)) at 9 Hz and lapsed time of 30 seconds, before the Nyamulagira eruption of 6 November 2011 in the Virunga volcanic region of eastern Democratic Republic of Congo. The period I (January March 2011) was characterized by low attenuation. It grows during period II (April August 2011) to reach a maximum on the period III (September October 2011) and decreases during period IV (01 06 November 2011). A significant decrease in attenuation characterizes the period V (7 November 2011 January 2012). An average attenuation growth preceded the magmatic eruption for about 7 months, with a transitional period (III) of maximum attenuation less than 2 months (46 days) before. This period corresponds to the emplacement of the magma in a confined storage area or into a shallow magma chamber and the creation of new fractures/cracks. A drop of attenuation is observed two days before the eruption after a total saturation of the fluid in fractures/cracks (period IV). Periods (I III and IV V) correspond respectively to the magmatic intrusion and eruption. The variation of the frequency parameter of Coda wave n indicates a change in the degree and dimension of fracturing over time. The significant differences between periods illustrate the change in volcanic activity in the Virunga region. | |
| dc.language | fra | |
| dc.publisher | Africa Museum | |
| dc.title | Temporal variation of Seismic coda wave attenuation in the Virunga volcanic region before the eruption of Nyamulagira of 06 November 2011, Democratic Republic of Congo | |
| dc.type | Article | |
| dc.subject.frascati | Earth and related Environmental sciences | |
| dc.audience | Scientific | |
| dc.subject.free | Geodynamics and mineral resources | |
| dc.subject.free | Natural hazards | |
| dc.source.title | Geo-Eco-Trop | |
| dc.source.volume | 41/2; Geohazards in the Great Lakes Region of Central Africa | |
| dc.source.page | 205-218 | |
| Orfeo.peerreviewed | Yes | |
| dc.identifier.url | http://www.geoecotrop.be/ | |
| dc.identifier.rmca | 5137 |