An improved stress map for Italy and surrounding regions (central Mediterranean)
An improved stress map for Italy and surrounding regions (central Mediterranean)
复制标题
改进的意大利及周边地区（地中海中部）压力图
DOI：
--
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
A. Amato
中科院分区：
文献类型：
--
作者：
P. Montone;M. T. Mariucci;S. Pondrelli;A. Amato
[1]我们介绍了意大利地区最新的现今应力数据汇编，并就该地区的地球动力学背景和地震活动进行了讨论。我们收集和分析了190个来自钻孔破裂、地震活动和活动断裂的新应力数据，并详细检查了以前的汇编[Monone等人，1999]。我们改进的数据集由542个数据组成，其中362个数据具有可靠的应力图质量。意大利地区采样良好，允许计算受约束的平滑应力图；对于周围地区，我们添加了2003年世界应力图发布数据。这些地图描绘了活动应力条件，在数据稀少的地区，有助于了解活动应力、过去的构造背景和研究区地震活动之间的关系。这些新数据在亚平宁前锋北部，从PO平原到亚得里亚海近海，以及西西里以北的南部第勒尼安海，特别具有代表性，它们指出了那里的挤压构造体制。在阿尔卑斯山，观察到了挤压和横流两种状态。我们的数据也证实了整个亚平宁带和卡拉布里亚弧都在延伸。在亚得里亚海中部海岸，从一种应力状态到另一种应力状态的变化表现为最小水平应力方向的突变。其他较温和的应力旋转，例如，从亚平宁南部到卡拉布里亚弧或沿着亚平宁北部，跟随弧曲率，与应力状态变化无关。
[1] We present an updated present-day stress data compilation for the Italian region and discuss it with respect to the geodynamic setting and the seismicity of the area. We collected and analyzed 190 new stress data from borehole breakouts, seismicity, and active faults and checked in detail the previous compilation [Montone et al., 1999]. Our improved data set consists of 542 data, 362 of which with a reliable quality for stress maps. The Italian region is well sampled, allowing the computation of constrained smoothed stress maps; for surrounding regions we added the World Stress Map 2003 release data. These maps depict the active stress conditions and, in the areas where the data are sparse, contribute to understand the relationship between active stress, past tectonic setting, and the seismicity of the study region. The new data are particularly representative along the northern Apennine front, from the Po Plain to offshore the Adriatic, and along the southern Tyrrhenian Sea, north of Sicily, where they point out a compressive tectonic regime. In the Alps both compressive and transcurrent regimes are observed. Our data also confirm that the whole Apenninic belt and the Calabrian arc are extending. Along the central Adriatic coast, changes from one stress regime to another are shown by abrupt variations in the minimum horizontal stress directions. Other gentler stress rotations, as, for instance, from the southern Apennines to the Calabrian arc or along the northern Apennines, follow the curvature of the arcs and are not associated to a stress regime variation.