S. Bello, M. Perna, Ada Consalvo, F. Brozzetti, P. Galli, D. Cirillo, Carlo Andrenacci, A. C. Tangari, Andrea Carducci, M. Menichetti, G. Lavecchia, F. Stoppa, G. Rosatelli
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引用次数: 1
摘要
对过去曾发生过强烈地震的断层进行系统研究是地震危险性评估的挑战。在碳酸盐岩景观中,利用切片边缘的稀土元素(REE)浓度可能有助于重建断层滑动历史。我们将该方法应用于1980年Irpinia CE地震断层(Mw 6.9)东南部的Caggiano正断层(意大利亚平宁山脉南部),这是1561 CE和1857 CE Basilicata地震(Mw 6.7和7.1)的部分原因。不对称陡崖高度剖面表明,断层在演化过程中发生了横向传播和沿走向变化。我们的结果表明,在LGM后的时间内,发生了7至11次滑动在~40厘米至~70厘米之间的地震。我们估计了各自地震的震级,在5.5到7.0之间,最常见的是在6.3到6.5之间。结果表明,复发时间在1.6千年至2.3千年之间,滑动率在0.6毫米/年至0.9毫米/年之间。该方法可用于世界范围内类似构造背景下的碳酸盐断层面。
Coupling rare earth element analyses and high-resolution topography along fault scarps to investigate past earthquakes: A case study from the Southern Apennines (Italy)
The systematic study of faults that have released strong earthquakes in the past is a challenge for seismic hazard assessment. In carbonate landscapes, the use of rare earth element (REE) concentrations on slickensides may aid the reconstruction of fault slip history. We applied this methodology to the Caggiano normal fault (Southern Apennines, Italy), cropping out southeast of the Irpinia 1980 CE earthquake fault (Mw 6.9), which was responsible for both the 1561 CE and partly the 1857 CE Basilicata earthquakes (Mw 6.7 and 7.1). We integrated the REE analysis approach with a high-resolution topographic analysis along 98 serial topographic profiles to measure vertical separations attributable to faulting since the Last Glacial Maximum (LGM). The asymmetric scarp height profiles suggest fault-lateral propagation and along-strike variations in the fault evolution. Our results indicate the occurrence of 7 to 11 earthquakes with variable slip between ~40 cm and ~70 cm within post-LGM times. We estimated the magnitudes of the respective earthquakes, between 5.5 and 7.0, and most commonly between 6.3 and 6.5. The results suggest a recurrence time between 1.6 k.y. and 2.3 k.y. and a slip rate ranging between 0.6 mm/yr and 0.9 mm/yr. This approach may be useful for application to carbonate fault planes in similar tectonic contexts worldwide.
期刊介绍:
Geosphere is GSA''s ambitious, online-only publication that addresses the growing need for timely publication of research results, data, software, and educational developments in ways that cannot be addressed by traditional formats. The journal''s rigorously peer-reviewed, high-quality research papers target an international audience in all geoscience fields. Its innovative format encourages extensive use of color, animations, interactivity, and oversize figures (maps, cross sections, etc.), and provides easy access to resources such as GIS databases, data archives, and modeling results. Geosphere''s broad scope and variety of contributions is a refreshing addition to traditional journals.