• Aucun résultat trouvé

Dynamic rupture simulation of the 2015 Mw 8.3 Illapel (Chile) earthquake

N/A
N/A
Info
Télécharger
Protected

Academic year: 2021

Partager "Dynamic rupture simulation of the 2015 Mw 8.3 Illapel (Chile) earthquake"

Copied!
2
0
0

Chargement.... (Voir le texte intégral maintenant)

Texte intégral

(1)

HAL Id: hal-01849334

https://hal-brgm.archives-ouvertes.fr/hal-01849334

Submitted on 26 Jul 2018

HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci- entific research documents, whether they are pub- lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers.

L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Dynamic rupture simulation of the 2015 Mw 8.3 Illapel (Chile) earthquake

Hideo Aochi, Sergio Ruiz

To cite this version:

Hideo Aochi, Sergio Ruiz. Dynamic rupture simulation of the 2015 Mw 8.3 Illapel (Chile) earthquake.

AGU Fall meeting 2018, Dec 2018, Washington DC, United States. �hal-01849334�

(2)

Dynamic rupture simulation of the 2015 Mw 8.3 Illapel (Chile) earthquake

The 2015 Mw 8.3 Illapel mega-thrust earthquake in the Chilean subduction has been studied by

different researches in its kinematics using the Chilean national networks of accelerograms and

continuous GPS as well as teleseismic data. In this study, we carry out dynamic rupture simulations to

characterize the frictional parameters. We suppose that the fault heterogeneity is expressed by

supposition of circular patches of different size and each of them is governed by slip-weakening

relation (dynamic strength drop 

b

and critical slip displacement D

c

) with respect to the initial shear

stress 

0

. Firstly, we found that the largest, main patch of a 50 km radius with 

b

= 10 MPa, D

c

= 1.6

m and 

0

= 5 MPa, whose center is by 60 km north in strike and by 50 km in up-dip from the

hypocenter, gives a comparable slip to the kinematic inversion results. When assuming a uniform

growth of the dynamic rupture from the hypocenter, the strong directivity to the north appears in

the simulations. However the observed waveforms in the near-field (accelerograms and continuous

GPS time series) indicate more complex, heterogeneous rupture growth. We then introduce several

small patches allowing complex growth of dynamic rupture between the hypocenter and the largest

patch. Our preferred model includes a secondary nucleation from the depth about 20 seconds later,

namely double events, also inferred from the seismological analyses on the accelerograms and by

back propagation studies..

Références

Télécharger maintenant ( PDF - 2 Page - 181.78 KB )

Documents relatifs

Les échelles d’équivalence complètes : une estimation intégrant les dimensions monétaire et temporelle des dépenses des ménages

L’analyse de l’allocation du temps des ménages aux enfants est au moins aussi difficile à analyser que les dépenses monétaires, dans la mesure où l’usage de ce

Ionospheric density variations recorded before the 2010 Mw 8.8 earthquake in Chile

This study shows that a large increase of the plasma density is very uncommon at this location and at this time and that the increases observed during the days before the main

Three-dimensional displacement field of the 2015 Mw8.3 Illapel earthquake (Chile) from across- and along-track Sentinel-1 TOPS interferometry

Akin to multiple aperture InSAR, a double difference of the phase within overlap regions is computed as follows (Figure 1, right): (1) calculate the interferogram using only the

Active thrust faulting offshore Boumerdes, Algeria and its relations to the 2003 Mw 6.9 earthquake.

As shown by a representative seismic section across the lower slope and deep basin (Figure 2), we find that the eastern uplifted domain (D1, Figure 1) is a wedged, piggyback basin

Calculation of a key function in the asymptotic description of moving contact lines

In such a model, the slip length is very small, of the order of molecular scales, which leads to different matched asymptotic regions, the smallest of which being the

Assemblages de coordination de platine(II) à ligands métallo-quinonoïdes : conception, luminescence et chiralité

Au cours de ce chapitre, nous avons pour la première fois fait la jonction entre deux des principales thématiques de l’équipe : l’étude de la chiralité en chimie

L’art de la différenciation : la montée au sommet des rappeurs PNL. « Ouais on est pas comme eux, ouais on pisse sur l'trône, on r'part avec les sommes »

21.. dominant et de différenciation. Enfin, nous verrons qu’à l’instar des Punks à leur époque, les PNL expriment leur distanciation en ayant recours à des procédés de

Direct single-shot observation of millimeter-wave superradiance in Rydberg-Rydberg transitions

The relatively long wavelength and large electric dipole transition moments associated with Rydberg-Rydberg transitions allows for the generation of a 100% oriented dipolar gas with