KIT –The Resea ch Uni e si y in he Helmhol z Associa ion
In es iga ion o seismic aniso opy in he D’’ laye and
a he CMB ega ding in ense magne ic lux egions
F öhlich Y onne, Dillah Muhammad I. F., Do n Fiona, Ri e Joachim R. R.
Ka ls uhe Ins i u e o Technology (KIT), Geophysical Ins i u e (GPI), Ka ls uhe, Ge many
Re e ences & Acknowledgemen s
Shea wa e spli ing (SWS)
PKS, SKS, SKKS (XKS) phases
S, ScS phases
→ Spli ing pa ame e s, spli ing in ensi y
Phase pai disc epancies
SKS s. SKKS
→ LMM man le con ibu ion
•YF is suppo ed by DFG g an RI1133/14-1 (SPP 2404 DeepDyn).
•Shea wa e spli ing measu emen s we e pe o med wi h Spli Lab 1.2.1 (Po i , 2014).
•Co ec ion o e o calcula ion in Spli Lab a e Walsh e al., 2013, h ps://doi.o g/10.1002/jg b.50386.
•Co ec ion o empo al alignmen in Spli Lab a e F öhlich e al., 2022, h ps://doi.o g/10.4401/ag-8781.
•Geog aphic maps we e gene a ed wi h PyGMT 0.12.0 (Tian e al., 2024) and GMT 6.4.0 (Wessel e al., 2022).
•Colo -coding was accomplished using colo maps o cmocean (Thyng e al., 2016) and Scien i ic colou maps 8.0.1 (C ame i, 2023).
Me hod
Inclusion o Exis ing Models and Da abases
Nowacki e al., 2011; Fig. 2, modi ied.
Fi s Resul s
Ray pa hs and a el imes a e iasp91 Ea h model (Kenne e al., 1991).
Calcula ion wi h he Ja a TauP Toolki (C o well e al., 1999).
Modeling
MATLAB Seismic Aniso opy Toolbox → Walke & Wookey, 2012
Conside a ion o di e en aniso opy sou ces → Nowacki e al., 2011
Conside a ion o phase ansi ions and slip sys ems → Piscon i e al., 2021
→ Se up di e en aniso opy / spli ing and e lec ion scena ios
AxiSEM2D / AxiSEM3D → Leng e al., 2016, 2019
Simula ions o wa e p opaga ion
Gene a ion o syn he ic seismog ams
→ Measu e shea wa e spli ing o SKS-SKKS, S-ScS phase pai s
→ Calcula e e lec ion coe icien s o P, S phases
Lib a y o elas ic enso s o LMM aniso opy
→ C easy e al., 2020
Shea wa e spli ing da abase
→ Wüs e eld e al., 2009
Deep man le aniso opy da abase
→Wol e al., 2023
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A lan ic Sibe ia
•C easy e al., 2020, G3, h ps://doi.o g/10.1029/2019GC008883.
•C o well e al., 1999, SRL, h ps://doi.o g/10.1785/gss l.70.2.154.
•G und & Ri e , 2019, Geology, h ps://doi.o g/10.1130/G45514.1.
•Kenne e al., 1991, Te a No a h ps://doi.o g/10.1111/j.1365-3121.1991. b00863.x.
•Leng e al., 2016, GJI, h ps://doi.o g/10.1093/gji/ggw363.
•Leng e al., 2019, GJI, h ps://doi.o g/10.1093/gji/ggz092.
Obse a ions a KEF
Complex spli ing pa e n
Disc epan SKS-SKKS pai s
Analyse o da a om u he s a ions
Sea ch o di e ences be ween
he a ge egions
AlpA ay ScanA ay USA ay
by FD
by MIFD
•Nowacki e al., 2011, J. o Geodyn., h ps://doi.o g/10.1016/j.jog.2011.04.003.
•Piscon i e al., 2021, JGR Solid Ea h, h ps://doi.o g/10.1029/2018JB016993.
•Walke & Wookey, 2012, Compu . Geosci., h ps://doi.o g/10.1016/j.cageo.2012.05.031.
•Wol e al., 2023, G3, h ps://doi.o g/10.1029/2023GC011070.
•Wüs e eld e al., 2007, Compu . Geosci., h ps://doi.o g/10.1016/j.cageo.2007.08.002.
•Wüs e eld e al., 2009, Phys. Ea h Plane . In ., h ps://doi.o g/10.1016/j.pepi.2009.05.006.
Shea wa e spli ing can be used o de ec seismic aniso opy in he
lowe mos man le (LMM) based on phase pai disc epancies, especially
using SKS and SKKS phases. Wi hin he p io i y p og am DeepDyn (SPP
2404), o de ails please e e o he pos e Thiyaga ajan & Thomas (2024),
we s udy a ge egions ela ed o in ense magne ic lux on he no he n
hemisphe e. He e we show i s esul s, including shea wa e spli ing
measu emen s a he eco ding s a ion KEF (ne wo k HE) in Finland.
Piscon i e al., 2021; Fig.5, sligh ly modi ied.
mine als s uc u es
LPO SPO
SKKS – spli SKKS – spli
SKS – null SKS – null
