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Global Positioning System Constraints on Active Crustal Deformation in Central Panamá

机译:全球定位系统对中部Panamá地壳主动变形的约束

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The tectonic setting of central Panamá has been controlled primarily by the collision of the Central American Arc with the South American continent, beginning in Miocene time (e.g., Coates et al., 2004). Ongoing collision at a rate of about 25 mm=yr has been inferred using campaign-style Global Positioning System (GPS) surveys from a sparse, long-baseline network covering the collision zone (e.g., Trenkamp et al., 2002; Fig. 1). The central portion of the Panamá block (Figs. 1 and 2) is commonly described as a nondeforming microplate (e.g., Trenkamp et al., 2002; Bird, 2003; Argus et al., 2011). However, appreciable Pleistocene crustal deformation has been suggested in central Panamá based on an analysis of the landscape and paleoseismological trenches (Rockwell et al., 2010a), and is likely a consequence of ongoing collision diffusely absorbing a fraction of Cocos-Nazca-Caribbean- South America relative plate motion (Rockwell, Bennett et al., 2010).
机译:从中新世时期开始,中部巴拿马弧与南美洲大陆的碰撞主要控制了帕纳马中部的构造环境(例如,Coates等人,2004年)。使用运动型的全球定位系统(GPS)调查,从覆盖碰撞区域的稀疏,长基线网络中推断出正在进行的碰撞,速率约为25 mm = yr(例如Trenkamp等,2002;图1)。 )。 Panamá块的中央部分(图1和2)通常被描述为不变形的微孔板(例如Trenkamp等,2002; Bird,2003; Argus等,2011)。但是,根据对景观和古地震trench沟的分析,已经在帕纳马中部提出了明显的更新世地壳变形(Rockwell等人,2010a),这很可能是由于不断碰撞的结果,扩散地吸收了一部分Cocos-Nazca-Caribbean-南美洲相对板块运动(Rockwell,Bennett等,2010)。

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