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首页> 外文期刊>Pure and Applied Geophysics >Estimation of Seismic and Aseismic Deformation in Mexicali Valley, Baja California, Mexico, in the 2006-2009 Period, Using Precise Leveling, DInSAR, Geotechnical Instruments Data, and Modeling
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Estimation of Seismic and Aseismic Deformation in Mexicali Valley, Baja California, Mexico, in the 2006-2009 Period, Using Precise Leveling, DInSAR, Geotechnical Instruments Data, and Modeling

机译：使用精确水准，DInSAR，岩土仪器数据和建模，估算墨西哥下加利福尼亚州墨西卡利山谷在2006-2009年期间的地震和非地震变形

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摘要

Ground deformation and seismicity in Mexicali Valley, Baja California, Mexico, the southern part of the Mexicali-Imperial valley, are influenced by active tectonics and human activity. In this study, data from two successive leveling surveys in 2006 and 2009/2010 are used to estimate the total deformation occurred in Mexicali Valley during 2006-2009. The leveling data span more than 3.5 years and include deformation from several natural and anthropogenic sources that acted at different temporal and spatial scales during the analyzed period. Because of its large magnitude, the aseismic anthropogenic deformation caused by fluid extraction in the Cerro Prieto geothermal field obscures the deformation caused by other mechanisms and sources. The method of differential interferograms stacking was used to estimate the aseismic (interseismic tectonic and anthropogenic) components of the observed displacement, using SAR images, taken in 2007 during a period when no significant seismicity occurred in the study area. After removing the estimated aseismic signal from the leveling data, residual vertical displacement remained, and to identify possible sources and mechanisms of this displacement, a detailed analysis of records from tiltmeters and creepmeters was performed. The results of this analysis suggest that the residual displacement is mainly caused by moderate-sized seismicity in the area of study. Modeling of the vertical ground deformation caused by the coseismic slip on source fault (primary mechanism) of the two most important earthquakes, May 24, 2006 (Mw = 5.4) and December 30, 2009 (Mw = 5.8), was performed. The modeling results, together with the analysis of geotechnical instruments data, suggests that this moderate-sized seismicity influences the deformation in the study area by coseismic slip on the source fault, triggered slip on secondary faults, and soft sediments deformation.
机译：墨西哥下加利福尼亚州墨西卡利-帝国山谷南部的墨西卡利山谷的地面变形和地震活动受到活跃构造和人类活动的影响。在这项研究中，使用2006年和2009/2010年连续两次水准调查的数据来估算2006-2009年期间墨西卡利山谷发生的总变形。整平数据的时间跨度超过3.5年，包括在分析期间来自多个自然和人为来源的变形，这些变形在不同的时空尺度上起作用。由于其大小很大，在塞罗普列托地热田中由流体萃取引起的地震人为形变掩盖了由其他机制和源引起的形变。差分干涉图叠加方法用于使用SAR图像估计观测位移的抗震（地震构造和人为构造）分量，该图像是2007年在研究区域未发生明显地震活动的时期拍摄的。从水准数据中去除估计的抗震信号后，仍保留了残余的垂直位移，并且为了确定该位移的可能来源和机理，对倾斜仪和蠕变仪的记录进行了详细分析。分析结果表明，残余位移主要是由于研究区域中度地震活动引起的。对2006年5月24日（Mw = 5.4）和2009年12月30日（Mw = 5.8）这两次最重要地震的震源断层（主要机制）的同震滑动引起的垂直地面变形进行了建模。建模结果以及对岩土仪器数据的分析表明，这种中等大小的地震活动通过源断层的同震滑动，次生断层的触发滑动以及软沉积物变形影响研究区域的变形。

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