Simultaneous Inversion of Hypocentral Parameters and Structure Velocity of the Central Region of Madagascar as a Premise for the Mitigation of Seismic Hazard in Antananarivo
Simultaneous Inversion of Hypocentral Parameters and Structure Velocity of the Central Region of Madagascar as a Premise for the Mitigation of Seismic Hazard in Antananarivo
复制标题
马达加斯加中部地区震源参数和构造速度同步反演作为塔那那利佛减灾的前提
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
G. Panza
中科院分区：
文献类型：
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作者：
G. Rambolamanana;P. Suhadolc;G. Panza
抽象的。利用马达加斯加中部地区局部地震的P波和S波到时数据，获得了分层速度。数据反演采用阻尼最小二乘法。使用的数据是770个P波到达时间的154个事件，震中在马达加斯加网络内的研究所和天文台德塔那那利佛（IOGA）经营的区域。这些数据联合用于地震震源和P波和S波速度模型的反演。在反演的第一步中不使用S波，因为它们的使用导致大的定位误差。如果P波的相位阅读误差约为0.1 s，则S波的相位读取误差要大得多。这里使用的参考平均模型是Rakotondrainibe（1977）给出的模型的变体。
Abstract.—A layered velocity is obtained using arrival-time data of P and S waves from local earthquakes for the Central Region of Madagascar. A damped least-squares method is applied in the inversion of the data. The data used are 770 P-wave arrival times for 154 events which have epicenters in the region inside the Malagasy network operated by the Institut et Observatoire de Géophysique d’Antananarivo (IOGA). These data are jointly used in the inversion for the earthquake hypocenters and P- and S-wave velocity models. S waves are not used in the first step of the inversion, since their use leads to large location errors. If the error on the phase reading for the P wave is about 0.1s, for the S wave it is considerably bigger. The reference average model used here is a variant of the model given by Rakotondrainibe (1977).