Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B31510.1 |
Holocene slip rate variability along the Pernicana fault system (Mt. Etna, Italy): Evidence from offset lava flows | |
D&1; 39;Amato, D.2 | |
2017-03-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2017 |
卷号 | 129 |
文章类型 | Article |
语种 | 英语 |
国家 | Italy; Scotland |
英文摘要 | The eastern flank of the Mount Etna strato-volcano is affected by extension and is slowly sliding eastward into the Ionian Sea. The Pernicana fault system forms the border of the northern part of this sliding area. It consists of three E-W-oriented fault sectors that are seismically active and characterized by earthquakes up to 4.7 in magnitude (M) capable of producing ground rupture and damage located mainly along the western and central sectors, and by continuous creep on the eastern sector. A new topographic study of the central sector of the Pernicana fault system shows an overall bell-shaped profile, with maximum scarp height of 35 m in the center of the sector, and two local minima that are probably due to the complex morphological relation between fault scarp and lava flows. We determined the ages of lava flows cut by the Pernicana fault system at 12 sites using cosmogenic He-3 and Ar-40/Ar-39 techniques in order to determine the recent slip history of the fault. From the displacementage relations, we estimate an average throw rate of similar to 2.5 mm/yr over the last 15 k.y. The slip rate appears to have accelerated during the last 3.5 k.y., with displacement rates of up to similar to 15 mm/yr, whereas between 3.5 and 15 ka, the throw rate averaged similar to 1 mm/yr. This increase in slip rate resulted in significant changes in seismicity rates, for instance, decreasing the mean recurrence time of M >= 4.7 earthquakes from similar to 200 to similar to 20 yr. Based on empirical relationships, we attribute the variation in seismic activity on the Pernicana fault system to factors intrinsic to the system that are likely related to changes in the volcanic system. These internal factors could be fault interdependencies (such as those across the Taupo Rift, New Zealand) or they could represent interactions among magmatic, tectonic, and gravitational processes (e.g., Kilauea volcano, Hawaii). Given their effect on earthquake recurrence intervals, these interactions need to be fully assessed in seismic hazard evaluations. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000396813200003 |
WOS关键词 | EARTHQUAKE RUPTURE FORECAST ; MOUNT-ETNA ; FLANK INSTABILITY ; DEFORMATION RATES ; COSMOGENIC HE-3 ; DISPLACEMENT ACCUMULATION ; GEODETIC OBSERVATIONS ; ASEISMIC DEFORMATION ; LAZIO-ABRUZZO ; GEOLOGIC DATA |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/25095 |
专题 | 地球科学 |
作者单位 | 1.Univ G dAnnunzio, Dipartimento Sci Pisicol, Salute Terr DiSPUTer, Chieti Pescara Via Vestini, I-66100 Chieti, Italy; 2.Scottish Univ, Environm Res Ctr, E Kilbride G75 0QF, Lanark, Scotland; 3.Ist Nazl Geofis & Vulcanol, Via Arcivescovado, I-67100 Laquila, Italy; 4.Ist Nazl Geofis & Vulcanol, Piazza Roma 2, I-00143 Rome, Italy; 5.Scottish Univ, Environm Res Ctr, NERC, Argon Isotope Facil, E Kilbride G75 0QF, Lanark, Scotland |
推荐引用方式 GB/T 7714 | D&,39;Amato, D.. Holocene slip rate variability along the Pernicana fault system (Mt. Etna, Italy): Evidence from offset lava flows[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2017,129. |
APA | D&,&39;Amato, D..(2017).Holocene slip rate variability along the Pernicana fault system (Mt. Etna, Italy): Evidence from offset lava flows.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,129. |
MLA | D&,et al."Holocene slip rate variability along the Pernicana fault system (Mt. Etna, Italy): Evidence from offset lava flows".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 129(2017). |
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