scholarly journals Soil gas geochemical behaviour across buried and exposed faults during the 24 august 2016 central Italy earthquake

2016 ◽  
Vol 59 ◽  
Author(s):  
Giancarlo Ciotoli ◽  
Alessandra Sciarra ◽  
Livio Ruggiero ◽  
Aldo Annunziatellis ◽  
Sabina Bigi
Keyword(s):  
Active Fault ◽  
Central Italy ◽  
Soil Gas ◽  
Seismic Sequence ◽  
Spatial Behaviour ◽  
Fault Rupture ◽  
Central Italy Earthquake ◽  
Geochemical Behaviour ◽  
Buried Fault ◽  
Soil Gas Survey

<p>Following the earthquake (M<sub>L</sub>=6.0) of 24 August 2016 that affected large part of the central Apennine between the municipalities of Norcia (PG) and Amatrice (RI) (central Italy), two soil gas profiles (i.e., <sup>222</sup>Rn, <sup>220</sup>Rn, CO<sub>2</sub> and CO<sub>2</sub> flux) were carried out across buried and exposed coseismic fault rupture of the Mt. Vettore fault during the seismic sequence. The objective of the survey was to explore the mechanisms of migration and the spatial behaviour of different gas species near still-degassing active fault. Results provide higher gas and CO<sub>2</sub> flux values (about twice for <sup>222</sup>Rn and CO<sub>2</sub> flux) in correspondence of the buried sector of the fault than those measured across the exposed coseismic rupture. Anomalous peaks due to advective migration are clearly visible on both side of the buried fault (profile 1), whereas the lower soil gas concentrations measured across the exposed coseimic rupture (profile 2) are mainly caused by shallow and still acting diffusive degassing associated to faulting during the seismic sequence. These results confirm the usefulness of the soil gas survey to spatially recognise the shallow geometry of hidden faults, and to discriminate the geochemical migration mechanisms occurring at buried and exposed faults related to seismic activity.</p>

Kinematic constraining of the multi-fault rupture dynamics of the Norcia, Mw 6.5, 30 October 2016, Central Italy earthquake

2020 ◽  
Author(s):  
Elisa Tinti ◽  
Emanuele Casarotti ◽  
Alice-Agnes Gabriel ◽  
Taufiqurrahman Taufiqurrahman ◽  
Thomas Ulrich ◽  
...  
Keyword(s):  
Central Italy ◽  
Source Inversion ◽  
Fault Rupture ◽  
Kinematic Modeling ◽  
Dynamic Rupture ◽  
Multiple Faults ◽  
Initial Strength ◽  
Central Italy Earthquake ◽  
Kinematic Models ◽  
Geological Constraints

&lt;p&gt;The 2016 Central Italy sequence showed a remarkable complexity involving multiple faults. Highly heterogeneous slip distributions were inferred from kinematic finite source inversions. The coverage and quality of the geodetic and seismic data allow resolving high-resolution details of rupture kinematics of the largest event of the sequence, the Mw 6.5 30 October 2016 Norcia earthquake. Composite fault rupture models suggest that two fault planes may have slipped simultaneously. Nevertheless, kinematic modeling cannot assess the mechanic viability of such multiple fault plane models.&lt;/p&gt;&lt;p&gt;Using SeisSol, a software package for simulating wave propagation and dynamic rupture based on the arbitrary high-order accurate derivative discontinuous Galerkin method, we therefore try to generate spontaneous dynamic ruptures models compatible with the two fault planes constrained by kinematic inversions. To this end, we adopt a simple slip-weakening friction law with spatially variable dynamic friction and initial strength parameters along multiple faults, compatible with the slip distributions found in the literature. Although we do not to aim to explore the full parameter space, our approach allows testing the feasibility of kinematic models in conjunction with successfully generating spontaneous dynamic rupture scenarios matching seismic and geodetic observations with geological constraints. Such linking enhances and validates the physical implications of kinematic earthquake source inversion.&lt;/p&gt;

scholarly journals Rn and CO<sub>2</sub> geochemistry of soil gas across the active fault zones in the capital area of China

2014 ◽  
Vol 2 (2) ◽  
pp. 1729-1757 ◽  
Author(s):  
X. Han ◽  
Y. Li ◽  
J. Du ◽  
X. Zhou ◽  
C. Xie ◽  
...  
Keyword(s):  
Active Fault ◽  
Emission Rate ◽  
Active Faults ◽  
Soil Gas ◽  
Spatiotemporal Variations ◽  
Gas Emission ◽  
North East ◽  
The North ◽  
Soil Gas Survey ◽  
Soil Gas Sampling

Abstract. The present work is proposed to investigate the spatiotemporal variations of soil gas Rn and CO2 across the active faults in the capital area of China, for the understanding of fault activities and the assessment of seismic hazard. A total of 342 soil gas sampling sites were measured twice in 2011 and 2012 along seven profiles across four faults. The results of soil gas surveys show that in each profile, due to the variation of gas emission rate, the concentrations of Rn and CO2 changed in the vicinity of faults. Spatial distributions of Rn and CO2 in the study areas were different from each other, which was attributed to soil types affecting the existence of Rn and CO2. Compared with 2011 soil gas survey, the increases of Rn and CO2 concentrations in 2012 were related to the enhancement of seismic activities in the capital area of China. Our results indicate that special attention for seismic monitoring should be paid to Xinbaoan-Shacheng Fault and the north east segment of Tangshan Fault in the future.

scholarly journals Soil gas survey for tracing seismogenic faults: A case study in the Fucino Basin, central Italy

1998 ◽  
Vol 103 (B10) ◽  
pp. 23781-23794 ◽  
Author(s):  
G. Ciotoli ◽  
M. Guerra ◽  
S. Lombardi ◽  
E. Vittori
Keyword(s):  
Central Italy ◽  
Soil Gas ◽  
Seismogenic Faults ◽  
Fucino Basin ◽  
Soil Gas Survey

scholarly journals Recent seismicity before the 24 August 2016 Mw 6.0 Central Italy Earthquake as recorded by the ReSIICO seismic network

2016 ◽  
Vol 59 ◽  
Author(s):  
Simone Marzorati ◽  
Marco Cattaneo ◽  
Massimo Frapiccini ◽  
Giancarlo Monachesi ◽  
Chiara Ladina
Keyword(s):  
Central Italy ◽  
Seismic Network ◽  
Seismic Sequence ◽  
L’Aquila Earthquake ◽  
Preliminary Results ◽  
Seismic Sequences ◽  
Seismic Swarm ◽  
Central Italy Earthquake ◽  
2009 L’Aquila Earthquake ◽  
Preparatory Phase

The seismicity of the last four years before the August 24 2016 01:36 UTC M<sub>W</sub> 6.0 earthquake that struck central Italy is presented with the aim to understand the preparatory phase of the event. In contrast with the 2009 L’Aquila earthquake that was preceded by a seismic sequence and the 2013-2015 Gubbio seismic swarm that, to date, is ended without any strong event, our preliminary results don’t show seismic sequences in the last months previous the mainshock of the August 24 2016 and a low similarity between seismicity clusters in the last four years and the foreshocks.

scholarly journals Testing the value of a multi-scale gravimetric analysis in characterizing active fault 2 geometry at hypocentral depths: the 2016-2017 Central Italy seismic sequence

2018 ◽  
Vol 61 (Vol 61 (2018)) ◽  
Author(s):  
Paola Luiso ◽  
Valeria Paoletti ◽  
Rosa Nappi ◽  
Germana Gaudiosi ◽  
Federico Cella ◽  
...  
Keyword(s):  
Active Fault ◽  
Central Italy ◽  
Gravimetric Analysis ◽  
Seismic Sequence ◽  
Multi Scale

Soil gas survey in the geothermal area of Bolsena Lake (Vulsini Mts., Central Italy)

Geothermics ◽  
1993 ◽  
Vol 22 (3) ◽  
pp. 201-214 ◽  
Author(s):  
E. Corazza ◽  
G. Magro ◽  
A. Ceccarelli ◽  
S. Pieri ◽  
U. Rossi
Keyword(s):  
Central Italy ◽  
Soil Gas ◽  
Geothermal Area ◽  
Soil Gas Survey

scholarly journals Digital Field Mapping and Drone-Aided Survey for Structural Geological Data Collection and Seismic Hazard Assessment: Case of the 2016 Central Italy Earthquakes

2020 ◽  
Vol 10 (15) ◽  
pp. 5233 ◽  
Author(s):  
Daniele Cirillo
Keyword(s):  
Remote Sensing ◽  
Active Fault ◽  
Central Italy ◽  
Seismic Hazard Assessment ◽  
Integrated Approach ◽  
Seismic Sequence ◽  
Geological Data ◽  
Digital Device ◽  
Remote Sensing Techniques ◽  
High Degree

In this work, a high-resolution survey of the coseismic ground ruptures due to the 2016 Central Italy seismic sequence, performed through a dedicated software installed on a digital device, is strengthened by the analysis of a set of drone-acquired images. We applied this integrated approach to two active sections of the Mt Vettore active fault segment which, in the Castelluccio di Norcia plain (central Italy), were affected by surface faulting after the most energetic events of the sequence: the 24 August, Mw 6.0, Amatrice and 30 October, Mw 6.5, Norcia earthquakes. The main aim is to establish the range in which the results obtained measuring the same structures using different tools vary. An operating procedure, which can be helpful to map extensive sets of coseismic ground ruptures especially where the latter affects wide, poorly accessible, or dangerous areas, is also proposed. We compared datasets collected through different technologies, including faults attitude, dip-angles, coseismic displacements, and slip vectors. After assessing the accuracy of the results, even at centimetric resolutions, we conclude that the structural dataset obtained through remote sensing techniques shows a high degree of reliability.

The seismic sequence of 30th May–9th June 2016 in the geothermal site of Torre Alfina (central Italy) and related variations in soil gas emissions

2018 ◽  
Vol 359 ◽  
pp. 21-36 ◽  
Author(s):  
Thomas Braun ◽  
Marco Caciagli ◽  
Maria Luisa Carapezza ◽  
Daniela Famiani ◽  
Alessandro Gattuso ◽  
...  
Keyword(s):  
Central Italy ◽  
Soil Gas ◽  
Seismic Sequence ◽  
Gas Emissions

Choosing an appropriate soil-gas survey method

1992 ◽  
Vol 21 (1) ◽  
pp. 27-35 ◽  
Author(s):  
Nic Korte ◽  
Sandra Wagner ◽  
Jon Nyquist
Keyword(s):  
Soil Gas ◽  
Survey Method ◽  
Soil Gas Survey
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