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Probabilistic seismic hazard assessment for the main cities along the continental section of the Cameroon volcanic line
Arabian Journal of Geosciences ( IF 1.827 ) Pub Date : 2021-04-30 , DOI: 10.1007/s12517-021-07033-2
Etoundi Delair Dieudonné Ndibi , Eddy Ferdinand Mbossi , Nguet Pauline Wokwenmendam , Bekoa Ateba , Théophile Ndougsa-Mbarga

A probabilistic seismic hazard assessment has been carried out along the continental section of the Cameroon volcanic line (CVL) in West Africa. We compiled a catalogue of local earthquakes from different sources and homogenize the magnitudes to moment magnitude (Mw). The seismicity of the CVL is concentrated around Mount Cameroon the active volcano and diffuse on the rest. Three seismic source zones were identified: one in Mount Cameroun, the second NE of the volcano in the grabens of Kumba-Tombel, and the third seismic source corresponds to West Cameroon horst. The recurrence model is that of Gutenberg and Richter, ZMAP software was used to decluster the catalogue and to determine seismic parameters for each source zone. To calculate the hazard, we choose two ground motion prediction equations, and to account for uncertainties, a logic tree approach was implemented using CRISIS software. We estimated the peak ground acceleration (PGA) for eleven cities spread along the CVL, for return period (RP) 475 and 2475 years. The results show that for RP 475 years, Buea, located at the foot of Mount Cameroon, has a PGA of 10% g. This value decreases as one moves away from Buea. The seismic hazard was also calculated for the period of 0.2s. Uniform hazard spectra for RP 475 and 2475 years are plotted for three cities, each chosen in one of the seismic source zone. For each city and RP, the spectral acceleration increases with the period, up to around 0.1s, and then it decreases as the period increases.



中文翻译:

喀麦隆火山线大陆段主要城市的概率地震灾害评估

已经在西非的喀麦隆火山线(CVL)的大陆部分进行了概率地震灾害评估。我们编制了一份来自不同来源的当地地震目录,并将震级平均化为矩震级(Mw)。CVL的地震活动集中在活跃火山的喀麦隆山周围,并在其余部分扩散。确定了三个地震震源区:一个位于喀麦隆山,另一个是库姆巴通贝(Kumba-Tombel)grab陷的火山第二NE,第三地震震源对应于喀麦隆西部的霍斯特。递归模型是Gutenberg和Richter的递归模型,使用ZMAP软件对目录进行聚类并确定每个震源区的地震参数。为了计算危险,我们选择了两个地面运动预测方程,并考虑了不确定性,使用CRISIS软件实现了逻辑树方法。我们估算了沿CVL分布的11个城市的最高地面加速度(PGA),分别为返回期(RP)475和2475年。结果表明,在RP 475年中,位于喀麦隆山脚下的Buea的PGA为10%。随着人们远离Buea,该值会降低。还计算了0.2s的地震危险。绘制了三个城市的RP 475和2475年的统一危险谱,每个城市都在一个地震震源区中进行了选择。对于每个城市和RP,频谱加速度都随周期增加,直到0.1s左右,然后随周期增加而减小。

更新日期:2021-04-30
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