This paper discusses the response of topography and river networks to non-uniform lithology and tectonic forcing in the Umbria-Marche sector of the Apennines fold and thrust belt. We ruled out the role of variable erosion of rock types and interpret channel steepness data in terms of rock uplift, discovering a southward increase in the total amount of uplift. Such a trend appears as the large-scale response to uneven vertical motions of different sectors of the mountain ridge and foothills. The general coincidence between sector boundaries and transversal, NE-SW striking faults mapped by seismic interpretation in the outer zone of the fold and thrust belt, suggests that such faults extend to the SW, beneath the allochthonous thrust sheets of the mountainous area. Therefore, it may be inferred that such transversal faults represent long-lived, deeply rooted basement structures compartmentalizing both the axial and the outer zones of the fold and thrust belt. We suggest that differential uplift was essentially controlled by variable amounts of basement thrust displacement characterizing the compartmentalized belt. This interpretation deviates from a more conventional view that uplift of the central Apennines, particularly prominent in the south, is dynamically supported. Our results, besides shedding new light into the active tectonic behavior of a large portion of the Italian peninsula, also provide general insights into the surface response to the differential behavior of crustal blocks produced by along-strike segmentation of active mountain belts.

中文翻译：

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意大利 Umbria-Marche 亚平宁山脉地壳规模、活跃的沿走向分割的形态构造证据


本文讨论了地形和河流网络对亚平宁山脉褶皱带和逆冲带翁布里亚-马尔凯区非均匀岩性和构造强迫的响应。我们排除了岩石类型可变侵蚀的作用，并根据岩石隆起解释河道陡度数据，发现隆起总量向南增加。这种趋势表现为对山脊和山麓不同部分的不均匀垂直运动的大规模响应。扇形边界与横向的 NE-SW 走向断层之间的普遍重合，通过地震解释在褶皱和逆冲带的外部区域绘制，表明此类断层延伸到西南方向，在山区的异形逆冲片下方。因此，可以推断，这种横向断层代表了长寿的、根深蒂固的基底结构，将褶皱带和逆冲带的轴向和外部区域区分开来。我们认为，差异隆起基本上是由表征分隔带的可变基底推力位移量控制的。这种解释偏离了更传统的观点，即亚平宁山脉中部的隆升，特别是在南部尤为突出，是动态支持的。我们的结果除了为意大利半岛大部分地区的活跃构造行为提供了新的视角外，还为表面对活跃山带沿走向分割产生的地壳块不同行为的响应提供了一般见解。