scholarly journals Fast 3D seismic wave simulations of 24 August 2016 Mw 6.0 central Italy earthquake for visual communication

2016 ◽  
Vol 59 ◽  
Author(s):  
Emanuele Casarotti ◽  
Federica Magnoni ◽  
Licia Faenza ◽  
Francesca Comunello ◽  
Piero Polidoro ◽  
...  
Keyword(s):  
Seismic Wave ◽  
Seismic Event ◽  
Central Italy ◽  
Seismic Wave Propagation ◽  
Natural Phenomenon ◽  
3D Seismic ◽  
Civil Protection ◽  
Italian Region ◽  
The Public ◽  
Central Italy Earthquake

We present here the first application of the fast reacting framework for 3D simulations of seismic wave propagation generated by earthquakes in the Italian region with magnitude Mw 5. The driven motivation is to offer a visualization of the natural phenomenon to the general public but also to provide preliminary modeling to expert and civil protection operators. We report here a description of this framework during the emergency of 24 August 2016 Mw 6.0 central Italy Earthquake, a discussion on the accuracy of the simulation for this seismic event and a preliminary critical analysis of the visualization structure and of the reaction of the public.

scholarly journals Kinematic finite fault and 3D seismic wave propagation of the 24 August, 2016, Mw 6.0 central Italy earthquake

2016 ◽  
Vol 59 ◽  
Author(s):  
Federica Magnoni ◽  
Emanuele Casarotti
Keyword(s):  
Wave Propagation ◽  
Seismic Wave ◽  
Structural Model ◽  
Central Italy ◽  
Seismic Wave Propagation ◽  
Source Model ◽  
Geological Structure ◽  
Fault System ◽  
Central Italy Earthquake ◽  
Finite Fault

The magnitude Mw 6.0 earthquake of 24th August 2016 caused severe damages and nearly 300 fatalities in the central Italy region. Initial reports revealed an asymmetrical distribution of damage and coseismic effects, suggesting a major role of heterogeneities, both in the rupture history and in the geological structure of the region. Near realtime availability of seismological data afforded a timely determination of a finite fault model (Tinti et al., 2016). Here we test this source model by performing a 3D simulation of seismic wave propagation within a 3D structural model containing the major geological features of the region. Agreement between modeled seismograms and observed seismograms suggests that some complexities in the waveforms, such as high amplification in the region of the Mt. Vettore fault system, can be accounted for by complexities in the fault rupture and 3D structural models. Finally, the consistency of the hypothesis of two distinct events has been analyzed.

scholarly journals Constraining families of dynamic models using geological, geodetic and strong ground motion data: the Mw 6.5, October 30th, 2016, Norcia earthquake, Italy

2021 ◽  
Author(s):  
Elisa Tinti ◽  
Emanuele Casarotti ◽  
Thomas Ulrich ◽  
Duo Li ◽  
Taufiqurrahman Taufiqurrahman ◽  
...  
Keyword(s):  
Dynamic Models ◽  
Central Italy ◽  
Kinematic Model ◽  
Seismic Wave Propagation ◽  
Dynamic Rupture ◽  
Friction Coefficients ◽  
Multiple Faults ◽  
Central Italy Earthquake ◽  
Trade Offs ◽  
Kinematic Models

The 2016 Central Italy earthquake sequence is characterized by remarkable rupture complexity, including highly heterogeneous slip across multiple faults in an extensional tectonic regime. The dense coverage and high quality of geodetic and seismic data allow to image intriguing details of the rupture kinematics of the largest earthquake of the sequence, the Mw 6.5 October 30th, 2016 Norcia earthquake, such as an energetically weak nucleation phase. Several kinematic models suggest multiple fault planes rupturing simultaneously, however, the mechanical viability of such models is not guaranteed.Using 3D dynamic rupture and seismic wave propagation simulations accounting for two fault planes, we constrain 'families' of spontaneous dynamic models informed by a high-resolution kinematic rupture model of the earthquake. These families differ in their parameterization of initial heterogeneous shear stress and strength in the framework of linear slip weakening friction.First, we dynamically validate the kinematically inferred two-fault geometry and rake inferences with models based on only depth-dependent stress and constant friction coefficients. Then, more complex models with spatially heterogeneous dynamic parameters allow us to retrieve slip distributions similar to the target kinematic model and yield good agreement with seismic and geodetic observations. We discuss the consistency of the assumed constant or heterogeneous static and dynamic friction coefficients with mechanical properties of rocks at 3-10 km depth characterizing the Italian Central Apennines and their local geological and lithological implications. We suggest that suites of well-fitting dynamic rupture models belonging to the same family generally exist and can be derived by exploiting the trade-offs between dynamic parameters.Our approach will be applicable to validate the viability of kinematic models and classify spontaneous dynamic rupture scenarios that match seismic and geodetic observations at the same time as geological constraints.

A Procedure for 3D Seismic Simulation from Rupture to Structures by Coupling SEM and FEM

2020 ◽  
Vol 110 (3) ◽  
pp. 1134-1148
Author(s):  
Lei Zhang ◽  
Jin-Ting Wang ◽  
Yan-Jie Xu ◽  
Chun-Hui He ◽  
Chu-Han Zhang
Keyword(s):  
Wave Propagation ◽  
Seismic Wave ◽  
Earthquake Engineering ◽  
Seismic Wave Propagation ◽  
3D Seismic ◽  
Step Method ◽  
Entire Area ◽  
Fine Mesh ◽  
Finite Fault ◽  
Element Method

ABSTRACT This article aims at numerically simulating the 3D seismic wave propagation from rupture to structures. A two-step method coupling the spectral element method (SEM) and the finite-element method (FEM) is proposed based on the domain reduction method to simultaneously simulate the seismic wave propagation in large-scale regions and analyze the dynamic behavior of structures in local sites. First, the concept of the proposed two-step method is illustrated. In the first step, the seismic wave propagation of the entire area, involving the source, propagation media, and local region of interest, is simulated using the SEM. In the second step, the dynamic analysis of structure-foundation system with local geological and topographical conditions is implemented using the FEM in a fine mesh based on the results in the first step. Subsequently, the FEM grid size is evaluated to match the SEM results, and the proposed SEM–FEM procedure is verified using both point-source and finite-fault model in a layered flat model. Finally, two analysis examples are presented using the proposed procedure. The analysis results show that the proposed SEM–FEM procedure can well consider the effects of local geological and topographical conditions on synthesized ground motions and can be applied to the rupture-to-structure simulations in earthquake engineering.

PHYSICAL MODELING OF 3D SEISMIC WAVE PROPAGATION

1994 ◽  
pp. 637-686 ◽  
Author(s):  
Patrick N.J. Rasolofosaon ◽  
D. Martin ◽  
P.N.J. Rasolofosaon ◽  
F. Gascón ◽  
A. Bayón ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Seismic Wave ◽  
Physical Modeling ◽  
Seismic Wave Propagation ◽  
3D Seismic ◽  
3D Seismic Wave Propagation

scholarly journals Architectural Heritage: A Discussion on Conservation and Safety

Heritage ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 631-647 ◽  
Author(s):  
Antonio Borri ◽  
Marco Corradi
Keyword(s):  
Seismic Performance ◽  
Central Italy ◽  
Structural Safety ◽  
Architectural Heritage ◽  
Italian Region ◽  
Irreversible Damage ◽  
The Past ◽  
Central Italy Earthquake ◽  
Points Of View ◽  
Structural Engineers

This paper presents a study carried out in the Italian region of Umbria, after the 2016 Central Italy earthquake. The aim is to address the problem of the conservation and protection of architectural heritage in Italy. The application of retrofitting strategies, while improving the seismic performance of historic—and frequently listed by conservation bodies—buildings, will not significantly alter their appearance, will be reversible, and fall within the principle of minimum intervention (minimal (least) intervention (or conservative repair)). These issues were evaluated in the paper by considering the different points of view of structural engineers and conservators. Heavy structural-oriented interventions as well as the underestimation of the importance of the structural safety for masonry monuments has produced, in the past, irreversible damage to important buildings and monuments, and loss of architectural heritage in Italy. The requirement of structural safety, especially for monuments located in seismic-prone areas, is compared with the need for conservation. The Italian building guidelines for interventions of cultural heritage are also discussed, highlighting some limitations and important advancements.

An optimized parallelized SGFD modeling scheme for 3D seismic wave propagation

2019 ◽  
Vol 131 ◽  
pp. 102-111 ◽  
Author(s):  
Ning Wang ◽  
Hui Zhou ◽  
Hanming Chen ◽  
Yufeng Wang ◽  
Jinwei Fang ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Seismic Wave ◽  
Seismic Wave Propagation ◽  
3D Seismic ◽  
3D Seismic Wave Propagation
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