M-Split: a graphical user interface to analyze multilayered anisotropy from shear wave splitting

Date

2017-04-28

Author

Abgarmi, Bizhan
Özacar, Atilla Arda

Metadata

Show full item record

Item Usage Stats

140
views

0
downloads

Shear wave splitting analysis are commonly used to infer deep anisotropic structure. For simple cases, obtained delay times and fast-axis orientations are averaged from reliable results to define anisotropy beneath recording seismic stations. However, splitting parameters show systematic variations with back azimuth in the presence of complex anisotropy and cannot be represented by average time delay and fast axis orientation. Previous researchers had identified anisotropic complexities at different tectonic settings and applied various approaches to model them. Most commonly, such complexities are modeled by using multiple anisotropic layers with priori constraints from geologic data. In this study, a graphical user interface called M-Split is developed to easily process and model multilayered anisotropy with capabilities to properly address the inherited non-uniqueness. M-Split program runs user defined grid searches through the model parameter space for two-layer anisotropy using formulation of Silver and Savage (1994) and creates sensitivity contour plots to locate local maximas and analyze all possible models with parameter tradeoffs. In order to minimize model ambiguity and identify the robust model parameters, various misfit calculation procedures are also developed and embedded to M-Split which can be used depending on the quality of the observations and their back-azimuthal coverage. Case studies carried out to evaluate the reliability of the program using real noisy data and for this purpose stations from two different networks are utilized. First seismic network is the Kandilli Observatory and Earthquake research institute (KOERI) which includes long term running permanent stations and second network comprises seismic stations deployed temporary as part of the “Continental Dynamics-Central Anatolian Tectonics (CD-CAT)” project funded by NSF. It is also worth to note that M-Split is designed as open source program which can be modified by users for additional capabilities or for other applications.

URI

http://meetingorganizer.copernicus.org/EGU2017/EGU2017-11955.pdf
https://hdl.handle.net/11511/74762

Conference Name

European Geophysical Union, (23 - 28 Nisan 2017)

Collections

Department of Geological Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

M-Split: A Graphical User Interface to Analyze Multilayered Anisotropy from Shear-Wave Splitting Abgarmi, Bizhan; Özacar, Atilla Arda (2017-07-01) Shear-wave splitting analysis is commonly used to infer deep anisotropic structure. For simple cases, obtained delay times and fast-axis orientations are averaged from reliable results to define anisotropy beneath recording seismic stations. However, splitting parameters show systematic variations with back azimuth in the presence of complex anisotropy and cannot be represented by average time delay and fast-axis orientation. Previous researchers had identified anisotropic complexities at different tectonic...
Wall functions for boundary roughness prediction in uniform channel flows Aydın, İsmail (null; 2017-08-18) Boundary roughness is an important hydraulic parameter in describing dynamics of free surface flows. There is no direct method to estimate the possible boundary resistance in natural environment. Available empirical formulations are based on the particle
Nonlinear evolution and runup–rundown of long waves over a sloping beach Kanoğlu, Utku (Cambridge University Press (CUP), 2004-8-25) The initial value problem of the nonlinear evolution, shoreline motion and flow velocities of long waves climbing sloping beaches is solved analytically for different initial waveforms. A major difficulty in earlier work utilizing hodograph-type transformation when solving either boundary value or initial value problems has been the specification of equivalent boundary or initial condition in the transformed space. Here, in solving the initial value problem, the transformation is linearized in space at t = ...
MHD flow in a circular pipe with arbitrarily conducting slipping walls Senel, P.; Tezer, Münevver (2018-08-31) In this study, the magnetohydrodynamic (MHD) flow is simulated in a circular pipe with slipping and arbitrarily conducting boundary. The 2D governing coupled equations in terms of the velocity and the induced magnetic field are solved by the Dual Reciprocity Boundary Element Method (DRBEM). The discretized system of equations is solved in one stroke without introducing an iteration which reduces the computational cost. It is shown that, the flow decelerates, Hartmann layers enlarge through the top and the b...
Phi-indices approach and multivariable regression analysis for prediction of discharge in asymmetric straight compound open channel flows Al-Khatib, Issam A.; Göğüş, Mustafa (2014-08-01) This study is related to flow measurement structures of asymmetric compound cross section mostly suggested for sediment laden-rivers, streams and wadis. Nine different models of asymmetrical rectangular cross sections were tested for a wide range of discharges. In each model, the stages and corresponding discharges were measured. From these measurements, the average discharges utilizing the Phi-indices Approach were determined. In addition, a multivariable regression model was derived with high accuracy for...

Citation Formats

B. Abgarmi and A. A. Özacar, “M-Split: a graphical user interface to analyze multilayered anisotropy from shear wave splitting,” presented at the European Geophysical Union, (23 - 28 Nisan 2017), Vienna, Austria, 2017, Accessed: 00, 2021. [Online]. Available: http://meetingorganizer.copernicus.org/EGU2017/EGU2017-11955.pdf.