气候变化领域集成服务门户(CCPortal): Surface volume and gravity changes due to significant earthquakes occurred in central Italy from 2009 to 2016

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DOI	10.1007/s00531-019-01748-0
	Surface volume and gravity changes due to significant earthquakes occurred in central Italy from 2009 to 2016
	Riguzzi F.; Tan H.; Shen C.
发表日期	2019
ISSN	14373254
起始页码	2047
结束页码	2056
卷号	108 期号:6
英文摘要	We have modelled the surface volume and gravity changes caused by four seismic events: three mainshocks (moment magnitude Mw 6.0, 5.9, 6.5) occurred during the last seismic period started on 2016, August 24 in central Italy, and the 2009, April 6 L’Aquila Earthquake (Mw 6.3). Our calculations start from the source parameters estimated by the inversion of the largest dataset of Interferometric Synthetic Aperture Radar (InSAR) and global positioning system observations ever managed in Italy after earthquake occurrences, based on the half-space elastic dislocation theory. The vertical displacements modelled after the 2016 events allow to infer a substantial unbalance between the subsided and uplifted volumes. In particular, we detected ~ 106 × 106 m3 of hangingwall subsidence against ~ 37 × 106 m3 of footwall uplift, that accounts for ~ 74% of the total volume mobilization. From the ratio between the footwall and total deformed volumes, we have computed an average fault dip of ~ 47°, in line with the values retrieved by seismological methods. The total gravity variations which affected the study area are of the order of ~ 1 μGal (1 μGal = 10−8 ms−2) in the far field, and ~ 170 μGal in the near field. The area affected within a gravity change of 1 μGal is ~ 140 km long and ~ 57 km wide, parallel to the Apennines mountain chain. The larger contribution is given by positive variations which account for the tensional style of deformation and larger subsided area. The significant gravity variations modelled from the coseismic deformations point out the need to update our knowledge about the absolute gravity field in Italy carrying out extensive measurements, and to align Italy to the recent international standards about national gravity and height networks (International Association of Geodesy, IAG Report, Commission 2—gravity field, http://www.iag-commission2.ch, 2015). © 2019, Geologische Vereinigung e.V. (GV).
英文关键词	2009 L’Aquila Earthquake; 2016 Norcia Earthquake; 2016 Seismic sequence; Central Italy; Coseismic vertical displacements; Gravity changes; Surface volume variation
语种	英语
scopus关键词	coseismic process; deformation; displacement; earthquake event; gravity field; source parameters; volume change; Abruzzi; Italy; L'Aquila; Aquila
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147794
作者单位	Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy; Institute of Seismology, China Earthquake Administration, Wuhan, 430071, China
推荐引用方式 GB/T 7714	Riguzzi F.,Tan H.,Shen C.. Surface volume and gravity changes due to significant earthquakes occurred in central Italy from 2009 to 2016[J],2019,108(6).
APA	Riguzzi F.,Tan H.,&Shen C..(2019).Surface volume and gravity changes due to significant earthquakes occurred in central Italy from 2009 to 2016.International Journal of Earth Sciences,108(6).
MLA	Riguzzi F.,et al."Surface volume and gravity changes due to significant earthquakes occurred in central Italy from 2009 to 2016".International Journal of Earth Sciences 108.6(2019).