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首页> 外文期刊>Pure and Applied Geophysics >Crustal Architecture at the Collision Zone Between Rivera and North American Plates at the Jalisco Block: Tsujal Project
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Crustal Architecture at the Collision Zone Between Rivera and North American Plates at the Jalisco Block: Tsujal Project

机译：哈利斯科州街区里维拉与北美板块之间碰撞区的地壳建筑：Tshual项目

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Processing and analysis of new multichannel seismic records, coincident with wide-angle seismic profiles, acquired in the framework of the TsuJal project allow us to investigate in detail the complex structure of the oceanic domain in the collision zone between Rivera Plate and Block Jalisco at its northern termination. The subducting Rivera Plate, which is overridden by the North American Plate-Jalisco Block, is clearly identified up to 21.5A degrees N (just south of Maria Magdalena Island) as a two clear reflections that we interpret as the interplate and Moho discontinuities. North of the Tres Marias Islands the seismic images display a different tectonic scenario with structures that are consistent with large faulting and rifted margin. A two-dimensional velocity approach for the crustal geometry is achieved using joint refraction/reflection travel time tomography, the uncertainty of the results is assessed by means of Monte Carlo analysis. Our results show an average oceanic crustal thickness of 6-7 km with a moderate increase towards the Jalisco Block, an anomalous thick layers (similar to 3.0 km) displaying a relatively low velocity (similar to 5.5 km/s) underneath Maria Magdalena Rise, and an estimated Moho depth deeper than 15 km in the collision zone between Rivera Plate and Jalisco Block. We have also determined an anomalous crust on the western flank of the Tres Marias Islands, which may be related to the initial phases of continental breakup of the Baja California Peninsula and Mexico mainland. High-resolution bathymetry provides remarkable images of intensive slope instabilities marked by relatively large slides scars of more than 40 km(2) extent, and mass-wasting deposits probably triggered by the intense seismicity in the area.
机译：在TsuJal项目的框架内获得的新的多通道地震记录的处理和分析与广角地震剖面相吻合，这使我们能够详细研究Rivera板块与哈利斯科州区块之间碰撞带中海域的复杂结构北端。俯冲的里维拉板块被北美板块-哈利斯科州地块所覆盖，被明确标识为北纬21.5A度（就在玛丽亚玛格达莱纳岛以南），这是两个清晰的反射，我们将其解释为板间和莫霍面间断。在特雷斯·马里亚斯群岛（Tres Marias Islands）北部，地震图像显示出不同的构造场景，其构造与大断层和裂谷边缘一致。使用联合折射/反射行进时间层析成像技术可以实现二维速度方法，用于地壳几何形状，其结果的不确定性通过蒙特卡洛分析进行评估。我们的研究结果表明，平均海洋地壳厚度为6-7公里，朝哈利斯科街区的方向适度增加，这是一个异常厚的层（约3.0公里），在玛丽亚马格达莱纳海峰下显示出相对较低的速度（约5.5公里/秒），在里维拉板块与哈利斯科州区块之间的碰撞带中，估计莫霍深度超过15公里。我们还确定了Tres Marias群岛西翼的异常地壳，这可能与下加利福尼亚半岛和墨西哥大陆的大陆解体初期有关。高分辨率测深可提供强烈的边坡不稳定性的显着图像，其特征是相对较大的滑坡伤痕超过40 km（2），并且该地区的强烈地震活动可能触发了浪费大量沉积物。

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