Geometry and quaternary slip behavior of the San Juan de los Planes and Saltito fault zones, Baja California Sur, Mexico: Characterization of rift-margin normal faults
Geometry and quaternary slip behavior of the San Juan de los Planes and Saltito fault zones, Baja California Sur, Mexico: Characterization of rift-margin normal faults
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墨西哥南下加利福尼亚州圣胡安德洛斯普拉内斯和萨尔蒂托断层带的几何形状和第四纪滑动行为：裂谷边缘正断层的特征
DOI：
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
G. M. Gutiérrez
中科院分区：
文献类型：
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作者：
Melanie M. Coyan;J. Arrowsmith;P. Umhoefer;J. Coyan;G. Kent;N. Driscoll;G. M. Gutiérrez
一系列向北、向左的活动正断层切割着加州湾的西南边缘，并横穿下加利福尼亚半岛的南端。这是加州湾内的扩张板块边界的海湾边缘断层系统。详细的地质和地貌测绘沿着岸上的圣胡安德洛斯平面和Saltito断层带，使我们能够描绘几何截面，并推断断层带的构造历史。为了更全面地了解更大阵列中的这些单个正断层，我们使用地震CHIRP（压缩高强度雷达脉冲）剖面法将断层映射到离岸10公里处。这两个陆上断层的滑动速率都很低，总偏移量也很低。沿着圣胡安德洛斯普拉内斯断层带（完全位于陆地上），年轻的陡坎形成断层重新激活了较老的断层，使一个宽的、低起伏的山前面破裂，该山前面有较薄的第四纪覆盖层，反映了沿着该断层带的两个阶段的滑动历史沿着。海上研究表明，陆上Saltito断层向北延伸，圣胡安德洛斯普拉内斯盆地东侧La加塔断层以北的复杂断层阵列向北延伸至西Cerralvo断层。我们的研究结果表明，相对较低的速率<1毫米/年的活动断层在整个圣胡安德洛斯平面系统的断层相比，高利率的活动海湾轴系统，和相对较高的速率在早期的新近纪海湾边缘断层在其他地区沿着西南湾的加州边缘。
An array of north-striking, left-stepping, active normal faults cuts the southwest margin of the Gulf of California and across the southern tip of the Baja California peninsula. This is the gulf margin fault system of the oblique-divergent plate boundary within the Gulf of California. Detailed geologic and geomorphic mapping along the onshore San Juan de los Planes and Saltito fault zones allowed us to delineate geometric sections and to infer the tectonic history of the fault zones. To achieve a more complete understanding of these individual normal faults within a larger array, we mapped faults to ∼10 km offshore using seismic CHIRP (compressed high-intensity radar pulse) profiling. Both onshore faults slip at a low rate and have a low total offset. Along the San Juan de los Planes fault zone, which is entirely onshore, the young, scarp-forming fault reactivated older faults to rupture a broad, low-relief pediment surface with thin Quaternary cover, reflecting a two-stage slip history along this fault zone. The offshore study suggests a northward continuation of the onshore Saltito fault, and a complex fault array north of the La Gata fault on the east side of the San Juan de los Planes basin extending northward to the west Cerralvo fault. Our results suggest relatively low rates of active faulting of <1 mm/yr across the San Juan de los Planes system of faults compared to high rates on the active gulf-axis system, and relatively higher rates on earlier Neogene gulf margin faults in other areas along the southwest Gulf of California margin.
影响因子：
2.8
作者：
C. Plattner;R. Malservisi;T. Dixon;P. LaFemina;G. Sella;J. Fletcher;F. Suárez‐Vidal
通讯作者：
C. Plattner;R. Malservisi;T. Dixon;P. LaFemina;G. Sella;J. Fletcher;F. Suárez‐Vidal