Databank

Databank

Posiva publishes Working Reports and Posiva Reports. From the year 2006 nearly all the reports have been published on our webpage and they can be found in the databank. In the databank you can also find our Annual Reviews and some other publications as well. You can also find print-quality pictures and useful links in the databank.

Recent publications


Workreport 2019-3

Back

Name:

Numerical Investigation of Earthquake Rupture and Off-Fault Fracture Response with a Coupled PFC3D/FLAC3D Environment

Writer:

Darcel, C., Dedecker, F., Emam, S., Tran, M-H.

Language:

English

Page count:

126

Summary:

A numerical model using a coupled approach between the distinct element software PFC3D and the finite difference software FLAC3D is setup to investigate off-fault fracture response to a controlled slip event triggered on the principal fault. The ability for PFC3D to simulate dynamic wave propagation at the desired scale is first verified, then the coupled PFC3D/FLAC3D approach is exercised on simple model scenarios and the results are sanctioned against analytical expectations, with a focus on velocity continuity and reduction of spurious, high-frequency, wave reflection at the interface between the discrete model and the finite-difference grid as well as at the outer boundaries of the finite-difference grid.

A boundary-value problem consisting of earthquake rupture and associated off-fault fracture response is constructed according to the model set up as reported by Fälth et al. (2015) for comparison of the model performance between the coupled PFC3D/FLAC3D and 3DEC tools. The coupled PFC3D/FLAC3D model approach behaves both qualitatively and quantitatively similar to the 3DEC model, with low magnitude of unrecovered slip displacement dynamically generated on the off-fault target fractures in the order of 1cm, for a controlled slip event on the order of 2m on the primary fault. This can be regarded as a conservative scenario with no internal source of energy dissipation besides frictional sliding at the fractures in the PFC3D/FLAC3D approach. Additional investigations of the role of select model parameters are conducted, and the influence of additional model features, such as the presence of background fractures and undulation of the primary fault geometry, is investigated in respect to the off-fault fracture response. While these additional features do not impact much the final results given the current limitations of the model, they provide some perspectives on the capabilities of the coupled PFC3D/FLAC3D approach to capture additional complexity in modelling of earthquake rupture process in a robust and efficient modeling environment.

Keywords:

PFC3D, FLAC3D, Earthquake, Rupture, Secondary Slip, Off-fault response

File(s):

WR 2019-03_web (pdf) (16.7 MB)


Back


Share article:
This website stores cookies on your computer. These cookies are used to improve our website and provide more personalised services to you.
Close

Cookies

To make this site work properly, we sometimes place small data files called cookies on your device. Most big websites do this too.

1. What are cookies?

A cookie is a small text file that a website saves on your computer or mobile device when you visit the site. It enables the website to remember your actions and preferences (such as login, language, font size and other display preferences) over a period of time, so you don’t have to keep re-entering them whenever you come back to the site or browse from one page to another.

2. How do we use cookies?

A number of our pages use cookies to remember your actions and preferences (such as login, language, font size and other display preferences.)

Also, some videos embedded in our pages use a cookie to anonymously gather statistics on how you got there and what videos you visited.

Enabling these cookies is not strictly necessary for the website to work but it will provide you with a better browsing experience. You can delete or block these cookies, but if you do that some features of this site may not work as intended.

The cookie-related information is not used to identify you personally and the pattern data is fully under our control. These cookies are not used for any purpose other than those described here.

3. How to control cookies

You can control and/or delete cookies as you wish – for details, see aboutcookies.org. You can delete all cookies that are already on your computer and you can set most browsers to prevent them from being placed. If you do this, however, you may have to manually adjust some preferences every time you visit a site and some services and functionalities may not work.

Close