The evolution of subduction forearcs as archived in the tectonic and geomorphic record serves to constrain geodynamic models of many convergent plate margins. This paper presents geomorphic stream channel metrics and river longitudinal profile modeling to assess geodynamic models describing the late Cenozoic horizontal translation of a Mediterranean forearc. The northern flank of Sicily is drained by roughly parallel north-flowing streams arranged across the hypothesized west-to-east migration path of the Calabrian forearc high. These streams present a snapshot of current geomorphic processes driven by spatiotemporal variations in crustal deformation, including river incision and landscape steepness. A stream power rule-based numerical modeling of the fluvial response time and knickpoint migration provides an independent prediction for the history of rock uplift associated with the translating forearc over the past ∼4 Myr. The results serve as a test for two, crustal wave versus transform-fault, end-member geodynamic models for the Calabrian forearc evolution, suggesting that our modeling supports the former. The river profile modeling shows that northern Sicily rivers experienced two pulses of time-transgressive rock uplift that progressively sweeps west to east. This analysis suggests the most rapid contemporary rock uplift rates are focused in NE-Sicily, where the forearc is currently located and where Pleistocene marine terraces indicate the highest rock uplift rates. These results are consistent with the west-to-east passage of a forearc high embedded in the subduction wedge, followed by a dynamic wave of rock uplift in its wake similar to what has been proposed for slab windows in other plate boundary settings.

中文翻译：

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卡拉布里亚 Forearc 翻译的地貌考察

在构造和地貌记录中存档的俯冲前弧的演化有助于约束许多会聚板块边缘的地球动力学模型。本文介绍了地貌河道指标和河流纵向剖面模型，以评估描述地中海前弧晚新生代水平平移的地球动力学模型。西西里岛的北翼被大致平行的北流排干，这些溪流穿过卡拉布里亚弧前高的假设的西向东迁移路径。这些溪流展示了由地壳变形的时空变化驱动的当前地貌过程的快照，包括河流切口和景观陡度。河流响应时间和拐点迁移的基于流功率规则的数值建模为过去~4 Myr 与平移前弧相关的岩石隆起历史提供了独立预测。结果用作对卡拉布里亚弧前演化的两个地壳波与变换断层端元地球动力学模型的检验，表明我们的模型支持前者。河流剖面模型显示，西西里北部的河流经历了两次随时间推移的岩石隆起脉冲，这些脉冲逐渐从西向东横扫。该分析表明，当代最快速的岩石抬升率集中在 NE-西西里岛，前弧目前位于该地区，更新世海相阶地表明岩石抬升率最高。