基于GPS观测的Baja California地震地壳变形分析

Crustal Deformation Analysis Derived from GPS Observations During Baja California Earthquake

  • 摘要: 2010-04-04墨西哥Baja California(32.259°N,115.287°W)Ms 7.2级地震发生在GPS连续观测站及钻孔应变仪相当密集的区域,利用GPS监测数据计算出了若干站点地震前后的位移量。地壳变形分析结果表明,离震中近的观测站变形量普遍较大,最大可达0.2m,大部分观测站明显向东南方向运动。通过选择较稳定的观测站作为参考站,计算了4观测站的动态变形序列,同时得到地震波的传播速度为3.2km/s,与应变观测计算结果比较吻合。

     

    Abstract: A magnitude 7.2 earthquake occurred on April 4,2010,in the upper Baja California peninsula of Mexico.The earthquake occurred in an area with dense GPS and borehole strainmeter observations stations.As GPS is capable of representing displacements occurring over a range of temporal and spatial scales,the displacements of several stations using the data before and after the earthquake are calculated,the results show that the stations close to epicenter is of great displacements which can up to 0.2m and most stations move towards southeast.Besides,the kinematic deformation series of several stations were obtained when a stable station was used as a reference station;it's shown that seismic waves can be derived from GPS observations,which is in very good agreement with borehole strainmeter observation.

     

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