Current block motions and strain accumulation on active faults in the Caribbean
Current block motions and strain accumulation on active faults in the Caribbean
复制标题
加勒比海活动断层上的当前块体运动和应变积累
DOI：
10.1002/2014jb011779
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
M. Higgins
中科院分区：
文献类型：
--
作者：
S. Symithe;É. Calais;J. D. Chabalier;R. Robertson;M. Higgins
加勒比板块及其与南北美洲的边界以俯冲和大型弧内走滑断层为标志，是研究与大地震有关的应变分配和地震间板块耦合的天然实验室。在这里，我们使用大多数可用的运动和连续的GPS测量在加勒比地区获得一个区域速度场表示在一个一致的参考框架。我们使用这个速度场作为输入到一个运动学模型，表面速度的结果，从锁定故障积累震间应变为界的刚性块的旋转，同时允许部分锁定沿着小安的列斯群岛，波多黎各，和伊斯帕尼奥拉岛俯冲。我们测试各种块的几何形状，指导以前的区域运动学模型和地质信息的活断层。我们的研究结果完善了一些以前建立的结果，特别是走滑断层系统的滑动速率，将加勒比板块的北部和南部，以及Gonave微板块的运动学。与以前的研究相比，我们在小安的列斯群岛的GPS速度场得到了很大的改进，不需要存在明显的小安的列斯群岛北方块体，也不需要在小安的列斯群岛-波多黎各俯冲板块界面上超过3 mm/年的应变积累，这基本上是不耦合的。从耦合俯冲到非耦合俯冲的转变与加勒比板块边缘从挤压（伊斯帕尼奥拉岛）到伸展（波多黎各和小安的列斯群岛）的长期地质行为的转变相吻合，这是与其他几个俯冲系统共享的特征。
The Caribbean plate and its boundaries with north and south America, marked by subduction and large intra‐arc strike‐slip faults, are a natural laboratory for the study of strain partitioning and interseismic plate coupling in relation to large earthquakes. Here we use most of the available campaign and continuous GPS measurements in the Caribbean to derive a regional velocity field expressed in a consistent reference frame. We use this velocity field as input to a kinematic model where surface velocities results from the rotation of rigid blocks bounded by locked faults accumulating interseismic strain, while allowing for partial locking along the Lesser Antilles, Puerto Rico, and Hispaniola subduction. We test various block geometries, guided by previous regional kinematic models and geological information on active faults. Our findings refine a number of previously established results, in particular slip rates on the strike‐slip faults systems bounding the Caribbean plate to the north and south, and the kinematics of the Gonave microplate. Our much‐improved GPS velocity field in the Lesser Antilles compared to previous studies does not require the existence of a distinct Northern Lesser Antilles block and excludes more than 3 mm/yr of strain accumulation on the Lesser Antilles‐Puerto Rico subduction plate interface, which appears essentially uncoupled. The transition from a coupled to an uncoupled subduction coincides with a transition in the long‐term geological behavior of the Caribbean plate margin from compressional (Hispaniola) to extensional (Puerto Rico and Lesser Antilles), a characteristics shared with several other subduction systems.
影响因子：
3.7
作者：
M. Manga;M. Hornbach;A. Le Friant;O. Ishizuka;N. Stroncik;T. Adachi;M. Aljahdali;G. Boudon;C. Breitkreuz;A. Fraass;A. Fujinawa;R. Hatfield;M. Jutzeler;K. Kataoka;S. Lafuerza;F. Maeno;M. Martínez-Colón;M. McCanta;S. Morgan;M. Palmer;T. Saito;A. Slagle;A. Stinton;K. Subramanyam;Y. Tamura;P. Talling;B. Villemant;D. Wall-Palmer;Fei Wang
通讯作者：
M. Manga;M. Hornbach;A. Le Friant;O. Ishizuka;N. Stroncik;T. Adachi;M. Aljahdali;G. Boudon;C. Breitkreuz;A. Fraass;A. Fujinawa;R. Hatfield;M. Jutzeler;K. Kataoka;S. Lafuerza;F. Maeno;M. Martínez-Colón;M. McCanta;S. Morgan;M. Palmer;T. Saito;A. Slagle;A. Stinton;K. Subramanyam;Y. Tamura;P. Talling;B. Villemant;D. Wall-Palmer;Fei Wang